CRF valve adjustments

[SirHilton17]

Does the CRF use shims to adjust the valves?.... or does it adjusters?
What about the YZF?
What are the avrage amount of hours on valves before they need to be replaced

Thanks

 

[Rich Rohrich]

From the DRN Knowledgebase - http://dirtrider.net/forums3/forumdisplay.php?f=179

VALVE TRAINS Part 1
http://dirtrider.net/forums3/showthread.php?t=115200

VALVE TRAINS Part 2
In the second part of our series on four-stroke valve trains we spotlight the characteristic problems with late model bikes.
http://dirtrider.net/forums3/showthread.php?t=115201