Anyone ever check the cylinder compression on one of these things...???

2 replies to this topic
  • MN_Kevin

Posted August 16, 2001 - 09:56 PM


Anyone have the numbers, in psig, of cylinder compression?

I should have checked this soon after I bought it, just so I would know when the rings needed to be replaced.

'99 WZ/YR (you choose!) with ALL YZ mods, de-octopused, DSP Doug Henry airbox w/ velocity stack, FMF PowerBomb header, Stroker SX-1 silencer, SS front brake line, OEM YZ tank, IMS YZ seat.

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  • jamracing

Posted August 20, 2001 - 10:18 AM


The best thing to do is a leakdown test. This will tell you if it's leaking, and if it's from the valves or rings. Compression should be around 180 psi, leakdown should be around 3%-10%.

  • leaky

Posted August 28, 2001 - 10:56 PM


i asked my mechanic and he said that if you find tdc then stand on the kickstarter it should hold your weight indefinetly. i own a 9/98 wr400 and can still put my full weight(100kg) on the kickstarter and the bike has done about 12000 km's


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