Quote:
Originally Posted by Zergman
Since I want to still be able to run regular pump gasoline and I don't want to have a low moto-hour engine, I'll probably stick with the 10:1 comp piston. It's on a "sale" right now, link given in the first post. It's a 98mm piston though...
So, what should I do with the gasket? 
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If you're staying original piston size, go for either genuine or quality pattern.
I've used loads of Athena head gaskets and gasket sets and never had a problem. Never had one come back.
Like many things in life, it's all about the prep work. Those mating surfaces need to be beautifully clean and smooth and most importantly, FLAT !!
If you're going for an oversize (which I think you will end up doing) then you're best off to get an oversize head gasket. I think you're better off with genuine Yam if you're going oversize too. You don't HAVE to go oversize with a head gasket but why wouldn't you !!
To be honest, when it comes to oversize stuff, I always go genuine as you will know it's been properly measured and tested.
I don't know you're level of experience but if you need to go oversize you need to get your barrel honed out (usually 0.25 or 0.50mm bigger) Eg, if you go 0.25mm bigger.
You need an oversize piston 0.25
Oversize rings to fit 0.25
Oversize head gasket 0.25
Same deal if you need to go 0.50mm over.
If you're barrel and piston are totally goosed then you might need a new cylinder sleeve putting in. Then you're back to standard sizes usually.
Hope that helps.
Ted
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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