SAE 20W40 type SE motor oil for > 40deg F SAE 10W30 type SE motor oil for < 60deg F
the difference is the Yamaha is better
There is NO WAY a stock Seca 2 will do 140. About 115-120, which isn't bad.
The spark plug gap in a Yamaha Seca is 1/2. It can be easily obtained and is very affordable and likely to be replaced by the owner. It is a quick replacement.
One quart
NGK D8EA/DR8EA/DR8EIX or equivalents.
What are the valve clearances on a 2001 Yamaha grizzly 600?
32HP
a diagram
about 60
one
BS30
50