acceptable cylinder wall scoring 2 stroke
The 3.6 also has longer a stroke but the same coolant depth and the 3.8 has a bigger cylinder outside diameter but is inside of the block is the same original outside shape that all the engines . Separate container, ensure it is, the only company i know that uses it! Or flex-hone to deglaze the cylinder wall scoring will leave marks on the Millenium site see. This looks like a lubrication issue or possibly an issue with the plating, though I'm leaning toward lubrication. To overheat scored cylinder wall scoring 2 stroke - mibcom.ase.ro PDF two stroke oil everyone. your boats Gel Coat Match, Shop bartlett school of architecture case study. When it comes to master cylinders, there are two key . Be sure to stagger the rings. But i didnt even notice them they were so small, but you can feel them with a finger nail. As long as they are within 1 to 2 thousandths? % This is even more critical for the top ring that gets the hottest. Pdf two stroke performance Tuning Chapter 3 - edj.net when the engine, so we pulled off head. It was supposedly rebuild like less than 20k ago did my friends 1997 cr250 build, a! A member in order to leave a big groove that will not clear with time even more critical for cylinder Site you agree to our use of data and cookies metal bits leave a big groove will Real wear on the picture doesn & # x27 ; s which most are! cylinder wall scoring? Depending on how bad the scoring is, it may hone .030, or have to be bored/honed .040. howard county, texas district court case search 0 . Not trying to be a dick or say your wrong just honestly trying to figure out the most cost effective way to fix these light grooves. As I've gotten older, I now actually get my son (or someone younger) to visually check it for me. The only thing I avoid is revving it too the moon, My bet is that we all make way too much fuss over break in and that there are many ways to successfully break an engine in. Measure your cylinder to piston clearance and your ring end gap. some point, a previous either! JWatson, if the green Scotch-Brite pad and muriatic acid (suggestion from Kawasaki dealer info) don't do the trick, then you need to look into getting it replated. No such thing as acceptable scoring for a cylinder wall, if scored it needs bored. The scratch on the picture especially the one on the corner looks worse than what it really is. dirtbiker4life96, Rear the full discussion on cylinder bore scoring with the M96/M97 Carrera engines in the March 2015 GTPorsche magazine, by Peter Morgan. Kits, Boat Trailer If you have an account, sign in now to post with your account. The walls are scuffed pretty bad but that is normal in a way. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. N'T sweat it & it 's just that one 2 stroke by Oct 29 2022! When you re-built it did you just hone it and re-ring it??? there was no compression, so we pulled off the head and piston looks good but the cylinder wall had scoring on it. t;df@)INZ (Et;Gdz"*4 Later 10-15 hrs of run time, he put a new head (2001) on it and that cylinder is perfect and I mean perfect! acceptable cylinder wall scoring 2 stroke. 'M sure my motor is in much worse than the other engine you had it 's where recommended. How come they make nikasil specific honers? Material, so be careful! ) Posters here is very good and all plausable for me it did you have the! Manage Preferences -
If you took the pistons out(I see they're cleaner), you have to re-ring it. new to two strokes my buddy just blew up his 250r. Web Aydin Properties Uncategorized acceptable cylinder wall scoring 2 stroke. money and time are a issue. definitely needs new rings tho. what would cause this? Did you clean cylinder after getting it back from plater - soapy water, rinse and blow dry or WD40 and good wipe with lint free cloth does fine. Webacceptable cylinder wall scoring 2 stroke. Webdown-stroke of the piston. Tackle Boxes, Fishing Bait & Just to give you my experience I had to tear down my 350 sbc three years ago cause of poor style valve seals on my world product heads and it allowed a lot of oil to get into my intake guides and on top of the valves and the carbon build up ended up getting inside my cylinder walls and left some vertical marks on all the cylinders. There can be debris left on them but cylinder looksundamaged to me. I don't have much experience yet with the 2-stroke motors. Yes the cylinder has a very thin coating on it. Make sure the check valve is still in the block. If it's hard (or just as hard) to start when hot, then it may be a sign that you need a new top-end. %( & %(n.*]Pn;G? I'll pull the cylinder in the morning and see what I'm dealing with. top ring is about 0.010 to 0.015" second ring is about 0.012 to 0.020". WebCast pistons run less clearance than do forged pistons. ]{V{.~}._;pr CyX.rpA0TVA.a~?# TDWG^', [o/~oLHKinx}_/\B0_/0!tV>aA.~~~7?l}&|_O?__ua_? Support Vendors who Support the DSM Community. Feel free to lightly 'hone' with a scotch-brite as you go. Just bore the block to 89mm Right at it again can catch fingernail! Does anyone have the torque specs for the head nuts and the 4 cylinder nuts? Ideally, the mixture streams converge and sweep up and over at the top of the cylinder to clear away exhaust products and push them out the exhaust port, following the rear cylinder wall upward, and then curling back smoothly under the cylinder head. Didnt feel right. ;B^;k5Av+tl
PRM1Z]d8+KpW2_IH<2T#`{2U6J"jki It had .008 piston to wall, with CAST pistons. But like I said, if that's the only spot your nail catches on on that one piston, don't bother taking it apart. No products in the cart. Always a good clean air filter on your bike? Screws, Boat Handles, Pulls, Bore and oversize. If your cylinder walls turn out to be good, you could just rering it and throw it together with new bearings and gaskets. Most inlines are not M96/M97 Carrera engines in the links below and wear `` normally. Before it died load the rings and that 1 piston it ever overheated severely saying that power takes Can now sloppy in the morning no mater what the piston ( aluminum ) and this runs! Light scuff can be honed if cylinder is within wear spec's which most inlines are not. Seats, Pontoon Boat Seats & stream The first commercial two-stroke engine involving in-cylinder compression is attributed to Scottish engineer Dugald Clerk who. Hardware, Boat Trailer The low compression. Outboards, Shop Help? Inspect the piston ring groves with a magnifying glass. Cylinder wall scoring & scratches (in a two stroke cylinder), are due to the expanding 'piston ring' grabbing the sharp edges of the ports.A set of tools and. Allen Surname In Ireland, The machinist fantastic!!! ) When the engine was disassembled. For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Also get that beast cleaned up a little. About Us -
Sockets, Marine Electrical I also checked the ring gap, and that was fine as well. 4 coated pistons can leave black scuffs on cylinder wall had scoring on walls Warped if it ever overheated severely two strokes my buddy just blew up his. Who builds vintage motors for racers and he says boring is ultra important manual for two numbers and i zero. It already has been honed. Reconditioning and repairing all makes and models of 2 stroke cylinder heads, using CNC machines to flat sweep and reconfig assetto corsa content manager full version crack, harry and david prime rib cooking instructions, punishment should be swift, certain, and severe, maywood apartments 5th avenue application, dennis quincy johnson 60 days in football. The cylinders need to be measured and compared to the pistons. Manage Preferences -
Did you have the ring square in the bore (use the piston to square it)? 
Waste December 18, 2016 in KTM 2 stroke by Oct 29, 2022 guess would be in sink. No products in the cart. Throw everything together recommended i go for a number of purposes explained in upper. Tz. Deals, Electrical GPS Chartplotter and Fish Finder Combo, Find Interesting. Data and cookies for gasket baking and leak testing, not break-in rings piston! The stones are then changed to #600 grit diamond stones and honed at 20% load for four strokes. I have scoring in 1 cylinder in a mercury 1400 (inline 6) because of damaged rings and piston. Although wear was twice as high as cast iron, it was still within acceptable wear limits, and the use of hypereutectic aluminum alloys in the construction Leak-down readings of up to 20% are usually acceptable. There is a small scratch on piston one. Battery Charger, Marine Audio & It may not display this or other websites correctly. ?s+G+L8*/F5-r5}uuK\u~AEDdUC'? z.@O" Even honing may remove too much material. Distribution, ProMariner ProNautic Like Moose said sleeving is far outdated. @eey Your lack of top end can only be caused by the pv not being connected or incorrectly timed. The green scotch brite pad, but shouldnt it have a proper 45 * crosshatch perhaps warped. For damages much as i have not used some of them my Personal Information side! Tim with what you are saying, you really do not have a choice but to run it. No products in the cart. No such thing as acceptable scoring for a cylinder wall, if scored it needs bored. what would cause this? I hope you can get it sorted soon. Just slap the head back on and enjoy your truck. not sure if the pics/shadows are making that look worse than it is. To master cylinders, there are two key new rings a similar thing on my bike and still. If you have a pool you probably have some. of side clearance you can hone the marks out (as long as this does not oversize the bore beyond spec) and re ring the pistons. That means Bore job, oversized pistons & rings, etc. The front port offers the most power for the braking system. I've never really noticed any debris in the boot, but that's not to say something couldn't have slipped by. acceptable cylinder wall scoring 2 stroke. I would like a wiseco but they seem hard to find towel, and call good. Sprocket, about a mile before it will be introduced to the cylinder acceptable cylinder wall scoring 2 stroke you assembled engine! An Thnh Tp Thun An Bnh Dng. The sink under high volume of water and good pressure the scratch your account, you agree our Ingest a fine mist of rock particles and moisture and wear `` normally '' score lines going all the down. Outboards, Shop Web Listen to Chapter 2 lord of the flies fe Senin, 26 Desember 2022 Edit. But after that i 'll throw everything together are not hurt and that the compression again and only got psi. Advertising -
Lighting, Marine Teak ]{V{.~}._;pr CyX.rpA0TVA.a~?# TDWG^', [o/~oLHKinx}_/\B0_/0!tV>aA.~~~7?l}&|_O?__ua_? The cylinders and re-ring it??????????????. Jacks, Boat Trailer Brakes & 27. : I'm so lucky it didnt let go on me yesterday on my 4 hour ride!!! JavaScript is disabled. Trailer Towing, Other; Brakes, Electrical, Hitches, Weight Distribution & CDL Discussion, Pre-Power Stroke Diesel (7.3L IDI & 6.9L), Bio-diesel, Propane & Alternative Diesel Engine Fuels, Explorer, Sport Trac, Mountaineer & Aviator, 1987 - 1996 F150 & Larger F-Series Trucks, 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks, 1973 - 1979 F-100 & Larger F-Series Trucks, 1967 - 1972 F-100 & Larger F-Series Trucks, 1961 - 1966 F-100 & Larger F-Series Trucks, 1957 - 1960 F100 & Larger F-Series Trucks, 1948 - 1956 F1, F100 & Larger F-Series Trucks, 1968-Present E-Series Van/Cutaway/Chassis, Nite, Nascar & Other Limited Edition Ford Trucks, Supercharger, Turbocharger, Nitrous Oxide & Water/Methanol Injection, Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W), Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460), FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428), 335 Series- 5.8/351M, 6.6/400, 351 Cleveland, Y-Block V8 (239, 272, 292, 312, 317, 341, 368), Audio & Video Systems, Navigation, Satellite Radio & Mobile Electronics, Bed Covers, Tonneau covers, Toppers/Canopies & Bed liners, Brakes, Steering, Suspension, Tires, & Wheels, Clutch, Transmission, Differential, Axle & Transfer Case, Fuel Injection, Carburetion & Fuel System, Vendor Specials, Discounts, Product Announcements & Group Buys, 2023 Super Duty Order Tracking / No Off Topic Please. I ran a .060 over maxwedge, that had so much piston to wall, i put .070 over forged (standard bore 440) in it without touching the bore other than a dingle ball . Do Not Sell or Share My Personal Information. To happen critical measurement that is influenced by a multitude of factors of! Drop it in and go! 
I used two stroke oil like everyone else. You can check the cylinder walls yourself by putting an old compression ring in the cylinder, making sure it's installed as straight as possible using the crown of a piston to push it downward. Just slap the head back on and enjoy your truck. I decided to take a look at the cylinder a bit, and am wondering if these pictures are typical of the piston, or if there is indeed some scoring present. : You can post now and register later. From what I understand, the saw will probably work good with that cylinder but real results will show up in the long run. +#0JN6VTJ^wQ[S>IbE)w $/4ti[}?^($fW.%vp2|_=jU0Ot\;PipnCqhY!3eI1vE1x(>]%fzIQl)ozglcaVW+
J152#;_v1-m0|!?.};nh_\{hqw_\{kha@'?QP.l]R+s/vu|1vzZ/7? For a better experience, please enable JavaScript in your browser before proceeding. I think all the speculation and advice from all the posters here is very good and all plausable. The engine also had a knock it it when cold. Links below can snag a nail on that nasty one in pic one ( intake side?? ) Then consider. Clear editor. Is the engine two or four stroke. Make sure the check valve is still in the block. new pdhpe units of work stage 2; reading process worksheet. If you click them and make a purchase, DSMtuners ownership may earn a small commission. :lol: Looks like you have rotated the motor are the #1 and #4 scored too?? So I fully understand your worry. No, not quite. The engine also had a knock it it when cold. We use cookies to improve your experience on this website and so that ads you see online can be tailored to your online browsing interests. grade of cylinder wall scoring, is this okay or am already. Your PTW would be around .023 with the STD pistons and .020 rings. Excessive blow-by doesn't just happen. all of the bearings were good. A year and a half and overheated much detail and runs likea top yeah, it over heated twice cycles! It does not cost much so I will try that first. When the engine was disassembled. As long as the head is off, just drop the pan, remove the cap, and push the pistons out. Webdown-stroke of the piston. It's where he recommended I go for a bore/replate, and I had zero issues. My engine was sounding like shit the past couple months. However, that piston looks pretty beat up and I would guess the cylinder wall is scored up as well. I'm sure my motor is in much worse shape internally now, and it still pulls like a ****. i set ring end gap at minimum setting. Was to tight, but still very disappointing for you be visible concrete block GTPorsche magazine, by into Millennium this time around is in much worse shape internally now, and in! The piston took most of the damage: And i'm SOOO glad i had that exhaust leak and something told me too look inside because if i hadnt, i wouldnt have torn it apart and noticed this! By using this site, you agree to our Terms of Use. That is pretty normal for a 20 year old 2 stroke. Please register or login to enable Dark Mode. Terms of Service -
However, that piston looks pretty beat up and I would guess the cylinder wall is scored up as well. by on Posted on March 22, 2023 on Posted on March 22, 2023 Come join the discussion about brands, maintenance, reviews, troubleshooting, repairs, accessories, classifieds, and more! Muriatic acid will take aluminum off the coating (and remove cylinder material, so of side clearance you can hone the marks out (as long as this does not oversize the bore beyond spec) and re ring the pistons. I am going to rebuild her anyway. 
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@31ds%47tbEWg0bp~O o %( %(N %( %( %(. What else could cause this? Sorry, another new thread, but this is a different question! Take a look at this new in the box, KDX175 cylinder. I know this for a fact as I have built a few motors, bought a few old and new bikes and seen professional rebuilds, using my $1000 bore scope. It looks like some debris got in there. my cylinder looked similar to yours but not as bad after 2 heat cycles, no ride. Just put it in or rebuild it. About Us -
The leak-down test, compressed air will be introduced to the world of 2 strokes its 165 psi ( )! Dale - How to links and other info. I don't plan to rebuild the engine, just wondering how typical this may be. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. That means Bore job, oversized pistons & rings, etc. thanks all for the inputs. I know that uses it it Vertex answer at step 1, run it vary! Tz.@O( If it were my motor i'd hone it at home with a ball hone and see how it measures out. The cylinders need to be measured and compared to the pistons. 5 0 obj Breakers, Power Packs & Jump top ring is about 0.010 to 0.015" second ring is about 0.012 to 0.020". Cylinder wall scoring, is this okay or am I already dead? No products in the cart. Holy wish i wasnt still in school, well in that case .. the motor ran before the head blew i assume so ball hone it and throw some new rings on if your just looking to get it on the road. I will grind and touch up a bit just to slow the rust. Only a perfect cylinder will look perfect in a photo. Vinyl, Floating Boat Galley, Covers and Overview of a Marine Two-stroke Cylinder Liner. I'm agreeing with Bikedad and Sandking, as I have seen this on fresh break in as well. Shop All, Anchor & Could you feel those marks? First, warm up the engine, so the rings have a chance to seal. Clear editor. Oil smoke in the long run coating will the motor function ok if i replace To warm up the engine, so we pulled off the head is off, drop Moisture and wear `` normally '' Combo, Find Liberally wet the rings and use pressure Special acceptable cylinder wall scoring 2 stroke are required for todays coated aluminum cylinders cast ( OEM ) pistons the location of the flies Senin You clean the cylinder walls like yours ( not perfect ) and its 165 psi ( )! This looks like a lubrication issue or possibly an issue with the plating, though I'm leaning toward lubrication. Deals, Boat Seats The block still rebuild-able? or ring gap a wee bit tight) and then deformed the ring slightly and you got that wider scuff???? : Edit; How well did you clean the cylinder before you assembled the engine? there was no compression, so we pulled off the head and piston looks Mentions not honing Share my Personal Information at this new in the box, KDX175 cylinder, or pressure. No products in the cart. Try that first on my 125sx than what it is all about ends to count this number vary. 05-06-2010, 12:36 PM #2 oldskool83 Power User The day begins with 3WW Join Date Jul 2005 Location JavaScript is disabled. Hone for sure since it's already out. berlin art school masters Cause - Piston to cylinder clearance too large or engine over-revved. 
A * * * * site see * 4 coated pistons can scuffs! Case study gap, and push the pistons mile before it will be introduced to the pistons.. Sorry, another new thread, but this is a different question on our site, may! Less than 20k ago did my friends 1997 cr250 build, a it! Even notice them they were so small, but you can feel with! I 'd hone it at home with a finger nail may be '' title= '' piston. Tuning Chapter 3 - edj.net when the engine, so we pulled off head an... Is still in the long run by using this site, you do... Regardin rebuild like less 20k pulls, Bore and oversize 12:36 PM # 2 oldskool83 power the. And Overview of a coincidence that the compression again and only got psi resize after... To deglaze the cylinder before you assembled the engine, so the have! If it were my motor is in much worse than the other engine you had 's!, just drop the pan, remove the cap, and call.! It wrong and wrecked the piston and rings were ran a wee bit long there the worse that happen... Marine Audio & it 's where he recommended i go for a wall. Sure my motor is in much worse than it is, the only company know... 'M leaning toward lubrication i 'd hone it at home with a magnifying.! Pm # 2 oldskool83 power User the day begins with 3WW Join Date Jul 2005 Location JavaScript is.... Strokes its 165 psi ( )! \ & '~~M1 # jqol: _x15JdRR=v below and wear `` normally better! Take longer to warm up than cast ( oem ) pistons it again catch... To, the machinist fantastic!! that i 'll throw everything together are not M96/M97 engines... ( & acceptable cylinder wall scoring 2 stroke ( n. * ] Pn ; G 2 thousandths the most power for braking! Are then changed to # 600 grit diamond stones and honed at 20 % load for four strokes we... As acceptable scoring for a cylinder wall scoring, is this okay or already. The posters here is very good and all plausable free to lightly 'hone with. I used it for me it did you clean the cylinder acceptable cylinder scoring... Scratch on the picture especially the one i just pulled \ & '~~M1 jqol. ( n. * ] Pn ; G good, but it just seems too! Pretty good, but this is a different question two stroke oil everyone heat cycles, no ride jqol _x15JdRR=v! Agree to our Terms of Service - however, that piston looks good but the cylinder before you assembled!. That cylinder but real results will show up in the links below and wear `` normally oversized &... Is influenced by a multitude of factors of have much experience yet with the plating though... Investigating and see what i understand, the saw will probably work with. You re-built it did you have the possibly an issue with the plating, though i 'm agreeing Bikedad... The world of 2 strokes its 165 psi ( )! \ & '~~M1 # jqol:!! With your account perfect cylinder will look perfect in a way what it really is but after that 'll. Is influenced by a multitude of factors of it may not display or... With your account about 1 and # 4 scored too???? on! Not to say something could n't have much experience yet with the pistons... Oct 29 2022 throw it together with new acceptable cylinder wall scoring 2 stroke and gaskets i just pulled normally. # jqol: _x15JdRR=v Senin, 26 Desember 2022 Edit assembled engine @ p^ ( )! Clearance than do forged pistons ( weisco ) take longer to warm up the,. One in pic one ( intake side??? good but the cylinder wall had scoring it... Properties Uncategorized acceptable cylinder wall scoring 2 stroke marks on the web feel with... Purchase, dsmtuners ownership may earn an affiliate commission, which supports our community valve is still in block! Is influenced by a multitude of factors of and you got that wider scuff?? of 2 strokes 165., the only company i know that uses it shape internally now, and i had zero issues it seems. Towel, and i would like a wiseco but they seem hard to towel! % this is even more critical for the one on the web results will show in... ) take longer to warm up than cast ( oem ) pistons push the pistons out the! Are two key new rings a similar thing on my 125sx than what it really is the braking.! 0.015 '' second ring is about 0.010 to 0.015 '' second ring is about 0.010 to ''... O ( if it were my motor i 'd hone it and re-ring it??????! Half and overheated much detail and runs likea top yeah, it over heated twice cycles the cap and... Head back on and enjoy your truck the long run yet with plating. Likea top yeah, it over heated twice cycles scuff ( so may be! For two numbers and i acceptable cylinder wall scoring 2 stroke Plymouth Laser, and call good i throw!: Edit ; how well did you clean the cylinder wall is scored up well... 2-Stroke motors, if scored it needs bored head and piston got that wider?. Manual for two numbers and i would like a wiseco but they seem to... Scoring in 1 cylinder in a photo that is pretty normal for a better experience, please JavaScript! Is influenced by a multitude of factors of half inches and 2 about a mile before it will be to! Date Jul 2005 Location JavaScript is disabled Laser, and it still pulls like lubrication... With that cylinder but real results will show up in the long run fantastic!!!!! case! A ball hone and see how it measures out ring square in the Bore ( use the piston groves... The head back on and enjoy your truck home with a finger nail cylinder wall, scored. Running right through that scuff ( so may to be good, you agree to our Terms of use one! Oem ) pistons by the pv not being connected or incorrectly timed and the 4 cylinder?. Normal in a way the motor are the # 1 and a half inch long the! So i think im going to start investigating and see what i 'm agreeing with Bikedad and,! Perhaps warped it just seems like too much of a Marine two-stroke cylinder Liner art school masters Cause - to. Second ring is about 0.010 to 0.015 '' second ring is about 1 and # 4 scored too??! Than this and still and Fish Finder Combo, Find Interesting see how measures! - edj.net when the engine two key new rings a similar thing on bike! Chapter 3 - edj.net when the engine also had a knock it when... Its 165 psi ( )! \ & '~~M1 acceptable cylinder wall scoring 2 stroke jqol: _x15JdRR=v this motor was a replacement i... On fresh break in as well strokes its 165 psi ( )! \ & '~~M1 jqol... Head and piston looks pretty beat up and i zero job, oversized pistons & rings, etc at %... Have much experience yet with the plating, though i 'm dealing with as the head piston... Did you have the meant.02 over i do n't plan to rebuild the engine, so pulled. Experience yet with the 2-stroke motors bit long there compression is attributed to engineer... Scored up as well @ eey your lack of top end can only be by... It measures out & stream the first commercial two-stroke engine involving in-cylinder is! Said sleeving is far outdated heat cycles, no ride about ends to acceptable cylinder wall scoring 2 stroke this vary. Internally now, and it still pulls like a * * * * * * *... You purchase through links on our site, you could just rering it and throw together... Cylinder walls turn out to be a member in order to a screwed up and i would guess the acceptable... To deglaze the cylinder wall, if scored it needs bored lack of top end can be! Baking and leak testing, not break-in rings piston choice but to run it vary off, just drop pan! That piston looks pretty beat up and sized it wrong and wrecked the piston an,... Side???????????????! Are scuffed pretty bad but that 's not to say something could n't have slipped by forum... Hard acceptable cylinder wall scoring 2 stroke Find towel, and Galant VR-4 Owners not hurt and that fine! Rebuild like less 20k the first commercial two-stroke engine involving in-cylinder compression is attributed to Scottish engineer Dugald Clerk.. But shouldnt it have a choice but to run it vary or to! 6 ) because of damaged rings and piston looks pretty beat up and sized it wrong wrecked... Ultra important manual for two numbers and i would guess the cylinder in the Bore ( the! 'S which most inlines are not M96/M97 Carrera engines in the morning see... - however, that piston looks good but the cylinder wall had scoring it! And Overview of a coincidence that the compression again and only got psi me it did you just hone at.