05 yfz450 valve clearance
Posted May 25, 2006 - 05:49 PM
Posted June 02, 2006 - 01:53 PM
Posted June 05, 2006 - 06:36 PM
Posted June 05, 2006 - 09:07 PM
Cold intake measurement should be between .10-.15mm, or .0039-.0059 in.
Cold exhaust is .20-.25mm or .0079-.0098 in. Exhaust will always have more slack in the measurement due to heat expansion.
On the YFZ, I always find my measurements on the quad first. Do each one three of four times and see if the gap gauge smaller or larger will insert. You may be surprised on the exhaust side! Take that and of course then you need to know what size shim you have in order to make any further shim changes by using the chart. I've seen the middle intake valve shimmed with a 165 and up to a 190, so don't think they are all the same-EVERY QUAD IS DIFFERENT. If you can read the numbers, use them and don't chance it by using dial calipers. If you do go with the self measure, use digital calipers on the standard, non metric setting. Metric is better, but the manual references shims by using the inch measurement. And it's confusing to some on how to convert. I'll post the shim chart shortly.
Posted June 06, 2006 - 01:27 PM
example- if the measured gap of a valve is at .10mm which = .0039in and you need to get to .15mm which = .0059in. and your shim size is 285mm.
VALVE TOO TIGHT
.15mm minus .10mm = .05mm
285 minus .05mm = 280mm shim (replacement shim)
IF YOU VALVE WAS TOO LOOSE,
you add the diiference to the current valve shim size.
THIS ONLY A EXAMPLE SHIMS AND VALVE LASH VARY FROM MACHINE TO MACHINE.
Posted June 06, 2006 - 06:51 PM