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Thread: cold seizure?

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    cold seizure?

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    Last edited by Pale Rider; 06-01-2015 at 10:15 PM.


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    Hey lilman! what`s up!

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    Sanfish's Avatar
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    Quote Originally Posted by Pale Rider View Post
    is there such a thing as a cold seizure in a 2 stroke?
    Heck yeah. Depending on what cylinder, you generally have a .0045 to .005 clearance. Tighter than that and bad things can happen.

    Things get really tricky when using Wiseco pistons for rec skis...These I do not recommend!

    I had a similar issue with what happened to you. In my case turned out to be a tiny particle had clogged the pilot jet and motor stuck at part throttle.

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    PWC Addict lilman573's Avatar
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    Sounds exactly like my 787 before it popped.It was running great the shut off at WOT. Its a bit coincidental that it pops right after you put the oil injection back on. Maybe it could have been adjusted a bit higher? Either way, I don't know if it was cold seizure, sounds like you warmed the motor up enough. To me it sounds like oil or gas starvation to have it die at full throttle.

    I have heard the exact same thing about the wiseco pistons. If i remember correctly, these were SBT rebuilts right? Doubt they were wisecos in the rebuild unless you put them there! lol

    I didn't know you could have a stuck ring and still have 150 psi!

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    Last edited by Pale Rider; 06-01-2015 at 10:15 PM.

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    Sanfish's Avatar
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    Quote Originally Posted by lilman573 View Post
    I have heard the exact same thing about the wiseco pistons.

    I didn't know you could have a stuck ring and still have 150 psi!
    The Wiseco pistons are only at tolerance AFTER warm up. Before that they are kinda tapered (from crown to skirt). Couple that with the harder forgings, makes the warm up process more important. You may have noticed a Wiseco motor rattles more before warmup.

    As for why a 2-stroke can still show high compression...If not really fubar, its caused from the now extra oil blowing and thus helps falsify the compression reading on gauges.

    As for fixing cylinder & piston. Personally, I don't care how little one stuck, I will always replace piston(s)! The cylinder should be fine and if you spot some aluminum (from pistons), you may want to rub a little muriatic acid (wash) on the area to eat away the alloy then do a stone-hone followed by a quick ball-hone to help ring seating.

    BTW: What was the piston/wall clearance? Did you double-check machine shop?

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    Last edited by Pale Rider; 06-01-2015 at 10:16 PM.

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