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  1. #1
    seaobin's Avatar
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    Cylinder to Ring Question

    If I have a 750 engine that has 140/140/90. Can I strip the whole top end and rebuild, without honing and re ringing the 140 cylinders.

    Or should I leave those alone and just re-hone and re-ring the bad cylinder


  2. #2
    Tony's Avatar
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    I'd just hone and put new rings on the 90 # cylinder.

  3. #3
    Hayabusa's Avatar
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    Quote Originally Posted by Tony View Post
    I'd just hone and put new rings on the 90 # cylinder.

    +1

  4. #4
    bowsniper's Avatar
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    Have you taken the head off that 90lb clylinder? Any Pics?
    Is the piston in good shape? Is it the original piston?
    Has a new piston been put in there to sorta "fix" the problem?
    If thats the case, you have other issues first, then an another piston!.

    Your cylinder nuts may be just loose. check them!.

    Your base gasket nuts could be loose too

    or the spark plug

    unless you fubarred the comp test on no.3

    did you check all 3 twice ?

    throttle open,choke open,cold,plugs in, good tester, confirmed test?

    Check the ports inside the cylinder and see if they got hung up there and wrecked the openings (the ports)

    Are the rings busted or melted to the cylinder?

    or missing? lol

    what does the top of the piston look like compared to the others?

    is the head gasket blown or cracked and /or missing?

    any cracks in the cylinder or head?

    Any major lines going thru the cylinder like a car got dragged thru it? lol

    does the head have damage?

    what kind. cuts,pits,burned areas,or total destruction?

    We need info

    ahh, just hone it and re-ring that cylinder +2

  5. #5
    Flying Scotsman's Avatar
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    Cylinder to Ring Question

    I saw the title and was confused.The rings ride on a film of oil in the cylinders they are basicaly touching each other.

    If I have a 750 engine that has 140/140/90. Can I strip the whole top end and rebuild, without honing and re ringing the 140 cylinders.

    Or should I leave those alone and just re-hone and re-ring the bad cylinder

    You can do just one cylinder without honing and re ringing the other two but you should really hone and ring the other two as well.
    I would ony advise going the cheap route if it was a case where you had too get a few more weeks riding in before the end of the season.

  6. #6
    bowsniper's Avatar
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    Why mess with the 2- 140's? thats great compression for a 750. just clean up the cylinder and through a little hone on it to make it shine and your good. But thats the least expensive way out! lol . If your gonna keep it, throw some money at it like a girlfiend! here honey, i bought you something. lol she'll give ya love back.! ride her! lol

  7. #7
    seaobin's Avatar
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    I guess I was not a clear as I wanted to be. I was planning on stripping down the engine this winter, becasue its winter and I know more than I did when I built it the first time.

    If I pull it apart, can I reuse the rings/pistons/clyinders, without honing and reringing (keeping cylinder and pistons matched) SO Center is 140. If I take it apart and keep Center Piston, Rings and Cylinder labled, will it build back well. Or should i just sink the $60 and get all new rings and do a fresh breakin in the spring

  8. #8
    Canadian Beaver Inspector jkindt's Avatar
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    If you do not mix up the parts, you can put it back together without needing new rings or anything. Just remember to lube them up good after you clean them so they dont start dry.

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    If you mark your pistons and put them back into the correct cyl, you should be fine.

    Remember that you need to break in the rings, even if you only replace them in 1 cylinder.

  10. #10
    bowsniper's Avatar
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    Keep the heads on the same cylinders too!. so everything is exactly like it was. Mark them 1 2 3 on cylinder head and jugs. no way to loose track then.

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