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  1. #1

    Can you bore just one jug?

    This is probably a stupid question but I bought a 95 750sl with a bad front cylinder. I had to buy a replacement piston/ring/etc and have it bored 0.040 (1mm) over. Is it gonna hurt anything just having the one done?


  2. #2
    cigarlust's Avatar
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    Engines... have this thing called balance... or are supposed to...


    Sounds like a grenade waiting to happen...

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    xplayer2885's Avatar
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    Quote Originally Posted by jason71832 View Post
    This is probably a stupid question but I bought a 95 750sl with a bad front cylinder. I had to buy a replacement piston/ring/etc and have it bored 0.040 (1mm) over. Is it gonna hurt anything just having the one done?
    Since you already bored that one cylinder you can either bore up the other two or find a matching cylinder. I have a freshly bored (1mm) cylinder an piston. PM me if you are interested. In total I payed around $210 bucks Ill let it go for $120 (piston,cylinder).

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    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by jason71832 View Post
    This is probably a stupid question but I bought a 95 750sl with a bad front cylinder. I had to buy a replacement piston/ring/etc and have it bored 0.040 (1mm) over. Is it gonna hurt anything just having the one done?
    Welcome To GREENHULK
    1 vote for running it as is-but i am know as the shadetree hack around these parts
    have fun and enjoy this place
    mattman

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk Jason.

    I'd have to say no to using that one. One, maybe 2 sizes over, I'd run it.

    1mm over the others is too big. It's unfortunate you already had it done. I was going to suggest buying another STD size cyl and going that route.

    Or do the other 2 cyls. What condition are they in?

    And finally, what caused the piston to fail? If you don't find the cause and fix it, it'll take out the new one really fast. Then you'll be doing this all over again.

  6. #6
    cigarlust's Avatar
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    That's the key, finding out why it failed... otherwise... a few hundred bucks later...

    Post some more info, when were carbs done, what was compression, post pics of the pistons...

  7. #7
    I had a polaris shop tell me that .25 over was fine. Buy yea, 1mm over might be pushing it. But if it were me, I'd run it.

  8. #8
    You didn't say ...but if there was a hole in the front cylinder It was caused by the OEM fuel pump not supplying enough fuel (lean/hot mixture).

    Need replace OEM fuel pump with 3 outlet Mikuni before proceeding.

    Be sure restrictor is in the return line to the tank

    Lots of info on this site.

  9. #9
    PolarisNut's Avatar
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    The balance from the factory isn't exactly "perfect"...They get it reasonably close in the casting, but there is no actual spin balancing done to the rotating assembly. It's a '95 750...not like you're building an 8000 rpm endurance race boat...I wouldn't worry about it personally. JMO....

  10. #10
    jdog800's Avatar
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    Just saw this discussion and had to reply. We been having this discussion over on the yamaha side about running with an overside piston.

    +1 on let it run. I have probably 10 to 15 customers over the last few years who went this route and have had no problems. The motors arnt balanced enough to make a difference and if you do the math the displacement increase is nominal.

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