Yamaha recommend the use of the gasket for all XT/ TT600 and is a relatively recent update. That gasket is supplied in all retrofit 3AJ oil pump kits for the early bikes. Suspect it is to ensure the perfect sealing of the oil feed ports that the gasket surrounds. If the holes arent perfectly sealed the pump may suck an amount of air ? Definitely worthwhile using considering the small cost, even though you can get away with out it.
|