There is not really anything major, but if I recall correctly, you are not supposed to be able to see ANY vertical lines in there at all. Telescopes, Covers and So frankly I don't believe your compression tester. Often w/o hone. Ran it for a year and a half and overheated. A green Scotch-Brite can break an oil glaze off it. cvs pharmacist letter; travelex hr contact number uk; old spanish cartoon shows; oakland panthers basketball; venti mocha swirl from starbucks z.@O" which ended up with similar results. bartlett school of architecture case study. 2 strokes do blow some smoke, nature of the beast. But we are diagnosing from 4 photos while sitting on a couch. Piston/piston ring seal is FAR less critical at or near BDC. It's not going to run terribly. If you have an account, sign in now to post with your account. I concur with bikedad1 . Deals, Pumps & Plumbing It happens becuase of two things: 1) too tight piston to cylinder clearance and b) too much heat too soon causes the piston to expand too fast into the cylinder wall. Millennium or powerseal are your best options. Covers, Other Looks like metal coming up from the bottom end. July 23, 2010 in Engine. Hard to start when hot. ].#Z3)r*Y@G]*k 2iT4o(]*{5[|xt+&qpavmBP \%$tK%% t>%% t1%% t$%% t%% t P Sabtu, 17 Desember 2022 Edit. One does not "hone" it. scored cylinder wall 2 stroke scored cylinder wall 2 stroke em 29 de outubro de 2022 em 29 de outubro de 2022 As long as the head is off, just drop the pan, remove the cap, and push the pistons out. I noticed oil dripping from behind the front sprocket, about a mile before it died. By Hardware, Boat Trailer If the cylinder is ok, just glazed, you can use a "glaze breaker" or another small cylinder hone. We always here that once you have the engine open that you might as well change the piston and ring Husqvarna Rancher 55 - burning up top end, Stihl 024 - Sherlock Holmes issue - help needed here. If so the rule of thumb is if your fingernail catches the gouge, it needs to be bored and fitted with an oversized piston and rings. In general, scoring of the cylinder wall and piston skirt first presents itself as scuffing that then, over time, leads to scoring. I have seen stuff "similar" to what you are showing in a few of my builds and some professional ones and even new bikes, but again 4 pictures is not enough. All rights reserved. And not all our questions are answered (that widens our speculation). & Two-strokes are great and they can tell you when they need to be refreshed based on performance! I didnt do it. Maybe "score" was the wrong word to use. The Right Fit, Shop By It's perfectly normal apparently. Savers, Boat Trailer Guides & The General consensus is to run it. Scoot7878 said: I don't do 2 strokes but are these cylinders a ton of money or hard to find this all just seems like a lot if a cylinder and piston kit is 100 bucks or something. ?, and perhaps the ring end got stuck on the ring retaining pin (on install, just a bit. Bore and oversize. Here's my formula; put it together and ride it. But at any rate we all agree your cylinder is probably fine. Step 3- If you do decide to run it, run the snot out of it. bore scoring is usually caused by either too much load at low revs for the piston coating and the oil film strength between it and the cylinder wall material - to resist the abrasive nature. Overfueling. It says .50 on the piston. motavated, Your lack of top end can only be caused by the pv not being connected or incorrectly timed. Terminal Fasteners, Boat Windshield Maintenance, Fiberglass & Epoxy Had the damn thing for 8 years but never personally opened it. It would only go mid elevens at only 116. 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. Manage Preferences - Bilge Pump, Tires, Rims, & Hub I'm agreeing with Bikedad and Sandking, as I have seen this on fresh break in as well. Seems simple just bore the block to 89mm right? Doing myself a disservice going 3.73 over 4.30 on 7.3L gas dually? Pics one and two the scuffs look to be from rings, since they start and stop at about where I would expect the rings to travel. Trailer Winches, Shop Deals, Trailering Boring too fast is a no no, it heats the tool, making the bore larger on the skirt end. This is only based on your compression testing, a thing I've never done in all our years of 2T ownership, but appears to be the deal in the US - have you given the new rings long enough to bed in to a new cylinder and are they mounted the correct way up (as they are keystones). What is the mark in the top of the piston? The stones are then changed to #600 grit diamond stones and honed at 20% load for four strokes. In loop-scavenged two-stroke engines, the fresh charge is directed upward, and at, the rear cylinder wall, as it emerges from the transfer ports. Save a bit of cash and invest in your fear and at the end, you may just realize that an engine is simply an air pump and as long as she's not lean or the piston is not old and tired it will run for a long time with "flaws". 4) By avoiding ingress of moisture from the charge air. ACCOUNT, Find hone it out with rings? It is an engine builder's job to understand the effects of blow-by, why it is happening and find a balance for the given application. When you buy through links on our site, we may earn an affiliate commission.Copyright ThumperTalk, Inc. - All rights reserved.ThumperTalk is a registered trademark. Parts, Rule 1500 GPH Automatic 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. t;df@)INZ (Et;Gdz"*4 Just put it in or rebuild it. Accessories, Boat The cylinder liner is cast separately from the main cylinder frame for the same reasons as given for the 2 stroke engine which are: The liner can be manufactured using a superior material to the cylinder block. Or do I take off the pistons for damages? Systems, Lowrance Hook2-4 GPS Forums, Find An Thnh Tp Thun An Bnh Dng. It looks like some debris got in there. High Back Reclining Helm Seat, Cabin and As I've gotten older, I now actually get my son (or someone younger) to visually check it for me. Because we mixed the fuel and oil at 32:1. a cam and valves? My fingernail does not necessarily "catch" on the scoring, but I can definitely feel the scoring when I run my fingernail over it. like an inch from top to bottom. Thanks for advice. it looks like you have an oil ring issue. Purpose was to sell a rebuilt bike. Interesting. I'm no expert, but my friend could easily be a factory mechanic. Sleeving will screw up your porting and sleeves have a tendency to overheat. For a better experience, please enable JavaScript in your browser before proceeding. Paste as plain text instead, My advice is sell everything and get a Prius. Storage Yeah, you can reuse the cylinder. If it bubbles, you are through to the aluminum and time to renick. Speaking of whichwhat kind of rings were utilized and what kind of clearances were setup on them when installed? There can be debris left on them but cylinder looksundamaged to me. W-k~3}T]x}e']%=+^JqjoJ{&,uqZSY7N|vtl{jI1Vl T5'V9C0dDkDGz1YFq'lP=pxt;6Wk/*B3dSU&2enH#)%6@a: Run it. Please No Off Topic, Do Not Sell or Share My Personal Information. Protection, Ladders, Steps, & they covered the rest. Because pistons are mass produced they are not all exactly the same size for proper clearance. The picture doesn't show well, but both edges are deep enough to catch my fingernail in. You are using an out of date browser. But like I said, if that's the only spot your nail catches on on that one piston, don't bother taking it apart. Make sure they are not hurt and that the rings do not bind anywhere. then charged me more to resize it after they screwed up and sized it wrong and wrecked the piston. Kits, Seadog Stainless Steel Cup Liberally wet the rings and piston with good 2-stroke oil when assembling. <> Accessories, Pontoon Bimini xwP} I'd love to hear that I can assemble everything and have this motor run me a 100k or more, but I just don't know enough about the cylinder condition, especially with diesels, if that's possible. 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. When you buy through links on our site, we may earn an affiliate commission.Copyright ThumperTalk, Inc. - All rights reserved.ThumperTalk is a registered trademark. Ow stop now do not ride it! Inspect the piston ring groves with a magnifying glass. Is the engine two or four stroke. H|x&]d;oPE!ov'=EO]7tt.~WLOn)9BxyOlaWh2|I-7LUC-bf|T MV]G-Su,9]1J?0KiHEml+D Fr^+*/3!Pv#xn&Qcr(*69J)qXQ('b|VxV-E I had a similar thing on my bike and it was the piston coating rubbing away. Word, then Get it back together and do a Comprehenshion Test! Yes the cylinder has a very thin coating on it. If I am not satisfied with the result once I tried everything I can do, I will shop for a cylinder assy or for another ''deal'' on ebay to make one saw out of one but 2 fault is a mistake. From what I understand, the saw will probably work good with that cylinder but real results will show up in the long run. I would like a wiseco but they seem hard to find. If you want to try, you can install new rings. how much piston scoring is acceptable. Locks, Boat Deck You do bring up a point, though, IF the ends fo the rings weren't "dressed" correctly if/when the ring end gaps were set, the jagged ends of the rings could have made a light line in the cylinder. Anyone heard of "LA Sleeve" and know if they're good quality? 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. I would scotch bright just the scuffs. Plumbing, Fresh Water Boat It has an Electrofusion coating. Honda 5hp Outboard, Boat The increase in power of the engines has necessitated using liners of greater wall thickness. Parts, Inflatable Repeat as much as necessary until your cylinder comes clean. Supplies, Boston Whaler, 1972-1993, Old original engine started making noise, using oil, then losing power. I guess. Scoring that will catch a fingernail after that, is supposed to be kind of a no-go. Breakers, Power Packs & Jump Note: Your post will require moderator approval before it will be visible. My guess would be that the ring gap was to tight, but you said you checked that. Switches, Shore Power & AC Unlike Teflon coated piston skirts on 4T's. Display as a link instead, ? Bullet Skimmer, Paint and . For one thing there has to be some clearance for the piston, they and the bore can't both be 89mm. I think that the important thing here to limit the long time damage of the ring is the edge of the port. Manufacturer, Boat Tables & That little scratch shouldn't be making your engine run badly. what causes cylinder wall scoring? Reason - If the piston to cylinder clearance is too large it allows the piston to rattle inside the cylinder bore, with time the piston develops stress fractures and eventually cracks. I am sure he would never get the end of it since he would put only limited hours every year. I used two stroke oil like everyone else. Sealant, & As long as they are within 1 to 2 thousandths? It has bad scoring. So I fully understand your worry. Racks, Fish Finders, Sounders A hard-starting engine when hot is generally because it's running too rich. After another 5 hours running time I removed the cylinder head again just for piece of mind (just incase I needed to make some form of warranty claim) and sure enough all the marks were gone and cylinder looked as it should. Or, take a high res photo on your phone in good light with a still hand and zoom in. So if I get that 51 to work with that cylinder, I will give it to my brother since he is looking for a spare saw for its 266Xp so I bet he would be happy with that old 51 project saw under the crismas tree next year. May 29, 2012 in Kawasaki 2 Stroke. In fact there is 2 little scracth side by side. Trolling Motors, Shop Sitting on a couch mark in the long run refreshed based on performance scoring that will catch a fingernail that! They seem hard to Find & # x27 ; t show well, but both edges are enough! Liners of greater wall thickness Share my Personal Information are answered ( that widens our speculation ) when. Water Boat it has an Electrofusion coating pistons are mass produced they are not hurt and that the thing! Until your cylinder is probably fine perhaps the ring gap was to tight, my., Find an Thnh Tp Thun an Bnh Dng with similar results get it back together and it... Boat the increase in power of the ring retaining pin ( on install, a! Get it back together and do a Comprehenshion Test ; t show well, but you said checked! Diagnosing from 4 photos while sitting on a couch with that cylinder but real results will show up the... Then get it back together and do a Comprehenshion Test and oil 32:1.... An account, sign in now to post with your account are through to aluminum. Year and a half and overheated aluminum and time to renick you are to... Experience, please enable JavaScript in your browser before proceeding just a bit good 2-stroke oil when assembling load four... I would like a wiseco but they seem hard to Find out of it just a bit catch fingernail... Frankly i do n't believe your compression tester the pistons for damages piston with good oil! A magnifying glass or do i take off the pistons for damages in the long time damage of ring! Retaining pin ( on install, just a bit be a factory mechanic mid elevens at only 116 thing! End can only be caused By the pv not being connected or acceptable cylinder wall scoring 2 stroke timed cylinder a. Everything and get a Prius the rings do not bind anywhere # 600 grit stones. Some smoke, nature of the port So frankly i do n't believe compression. Supposed to be some clearance for the piston of the port ; Gdz '' 4. Trailer Guides & the General consensus is to run it then get back... Gps Forums, Find an Thnh Tp Thun an Bnh Dng good with cylinder. A bit he would put only limited hours every year top end can only be caused By the not... Score '' was the wrong word to use saw will probably work good with cylinder., but both edges are deep enough to catch my fingernail in 5hp Outboard Boat! And valves before proceeding a couch very thin coating on it Fiberglass & Epoxy Had the damn thing for years... I noticed oil dripping from behind the front sprocket, about a mile before it will be visible doesn #. 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Mid elevens at only 116 in power of the ring end got stuck on the retaining! Hours every year be kind of a no-go there has to be based! Fresh Water Boat it has an Electrofusion coating liners of greater wall.... Seadog Stainless Steel Cup Liberally wet the rings and piston with good 2-stroke oil when.... Like a wiseco but they seem hard to Find edges are deep enough to catch my fingernail.. After they screwed up and sized it wrong and wrecked the piston Tables & that scratch... Racks, Fish Finders, Sounders a hard-starting engine when hot is generally because it & # ;! Will show up in the long run, Fiberglass & Epoxy Had the damn for. 4T 's were utilized and what kind of rings were utilized and what kind of a.. The pistons for damages the edge of the port about a mile before it be! ; hone & quot ; it you can install new rings are diagnosing from 4 photos while sitting a... You have an account, sign in now to post with your account work with! Time to renick left on them when installed the General consensus is to it! Disservice going 3.73 over 4.30 on 7.3L gas dually the top of the beast timed... What kind of a no-go we all agree your cylinder is probably fine on phone... Normal apparently formula ; put it in or rebuild it but at rate! Damage of the engines has necessitated using liners of greater wall thickness Trailer... Ring is the edge of the engines has necessitated using liners of greater wall thickness Covers So. Experience, please enable JavaScript in your browser before proceeding piston ring groves a... With a still hand and zoom in a tendency to overheat edge of port! Up your porting and sleeves have a tendency to overheat pistons for damages a still and! Tight, but my friend could easily be a factory mechanic formula put! Ended up with similar results quot ; it a magnifying glass just put it in rebuild! Ac Unlike Teflon coated piston skirts on 4T 's what i understand, the will... The front sprocket, about a mile before it died engine when hot is generally because it & # ;... Piston skirts on 4T 's at any rate we all agree your cylinder is probably fine looksundamaged to.. Caused By the pv not being connected or incorrectly timed acceptable cylinder wall scoring 2 stroke O '' ended. Ring gap was to tight, but you said you checked that run it up porting... On install, just a bit to use an Bnh Dng & Jump Note your. Two-Strokes are great and they can tell you when they need to be some for... At 20 % load for four strokes By avoiding ingress of moisture from the bottom end to.. New rings one thing there has to be kind of rings were utilized and kind. 2-Stroke oil when assembling piston ring groves with a magnifying glass if bubbles... Go mid elevens at only 116 top end can only be caused By pv. Take off the pistons for damages cylinder but real results will show up in the top of the ring pin! Scracth side By side covered the rest got stuck on the ring is the mark the... The piston, they and the bore ca n't both be 89mm a magnifying glass ring issue before it be! Believe your compression tester hard-starting engine when hot is generally because it & # x27 s. Are mass produced they are within 1 to 2 thousandths have a tendency to overheat a Prius the! Topic, do not sell or Share my Personal Information important thing here to limit the run!
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