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  1. #1
    Deanrw3's Avatar
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    SBT piston wall clearance

    Can someone confirm for me that 0.006" wall clearance will be ok for sbt pistons and 951 cylinders.

    The only reason i ask.

    Machine shop said they do these at 0.005
    Talked to a couple builders that say 0.006 +- .0005
    SBT recommended on the piston 0.007-0.008

    I told them 0.006 but they are not doing them till later in the week. Just thought I would double check. I am guessing this will be fine, but I don't really have the money to guess right now

    Thanks as always.

    Dean


  2. #2
    96XPSS's Avatar
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    Unless they are using Weisco's, .006" is fine. Make sure your machinist knows to mic from the skirt, not pin area.

    SBT recommends more so their warranty claims will be less.

  3. #3
    Deanrw3's Avatar
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    Thanks for the input.

    So what is the difference in running 0.001"?

    What are the advantages or disadvantages to running a tighter or more lose setup. Just for my knowlege.

    Thanks,
    Dean

  4. #4
    GOO$E Mongoose2's Avatar
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    if it were me i wouldnt put those sbt pistons in there...if u want it to last

  5. #5
    Deanrw3's Avatar
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    have you had a bad experiance with them? What was the problem?

    To be honest, i found something bad or good with just about every piston i did research on.

    thanks,
    dean

  6. #6
    2Blue's BFF! dsolie's Avatar
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    Quote Originally Posted by Deanrw3 View Post
    have you had a bad experiance with them? What was the problem?

    To be honest, i found something bad or good with just about every piston i did research on.

    thanks,
    dean
    Well said Dean...

    SBT Pistons are fine....If you are a rec rider... Planning on racing or sucking a lot of water, I would go with a more durable, forgiving piston..

  7. #7
    96XPSS's Avatar
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    I think SBT pistons are produced by WSM. WSm are the worst quality pistons, derived by experience through known people here.

    If it were mine I'd use ProX if OEM couldn't be used. Saving $20 or $40 isn't worth risking a seized or broken piston and additional down time.

  8. #8

    Smile

    Lets put it this way,cast pistons have there benefits,They are cheaper,very seldom cold seize,and dont require as tight a tolerance range.that said ,they are great for grandmas 951 gtx.Now forged pistons (wiseco,pro-x,etc.)require right clearance,need to be warmed up thoroughly before breakin,(can cold seize piston. expands faster than cylinder when cold)NOw for the good part.Wiseco pistons when installed and broken in correctly are tough ,long lasting,I have never seen one fail due to piston fault.I have rebuilt over 600 two stroke watercraft engines and have used only wiseco,except when they were not available.I tried one set of wsm once failed before break-in on 3rd tank of fuel)wiseco pistons are very well machined,very close in tolerance to the size they are supposed to be,and make for one heck of a good running engine.I build my engines on the tight side,I like them to sound crisp,no piston rattle or excess noise,THat said IF you want quality,long life,and good tight well built engine,go with wiseco.If you dont have the patience to properly break in an engine or wait for it to warm up before nailing it wide open,THen go with cast pistons,my grandma swears by them!!>Marvin

  9. #9
    tweeker's Avatar
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    SBT=JUNK like Goose said, If it were mine I would set it up a .004 and break it in properly,The factory sets it s .035.Just my .02 cents.I have only built a couple dozen

  10. #10
    GOO$E Mongoose2's Avatar
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    if u don't have the money to screw up...put prox in there....

    or run it for 20 hours on sbt and then put prox in there and bore the cylinders

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