Question about 1987 Yamaha TZR 250

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Iv just bought a tzr 125 belgarda its smokes like hell and will not rev up.. someone said it may be leaking gearbox oil into the piston some how?? i changed the plug.. and turned the power valve to open reved with it open and closed..still no good! it blowes what looks like black oil out the exhaust. its sparks fine and ticks over all day. just the smoke and stutters when u try to rev it. thanks nick.. PS COULD NOT FIND TZR 125. SO LISTED IT AS 250..

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There are two places where gearbox oil can leak into the combustion process: from the gasket between the two engine case halves, or from the crank seal on the right hand end of the crankshaft. The most likely culprit is the crankshaft seal.

Posted on Nov 15, 2009

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