Originally Posted by Zecatfish
I've got to rebuild the head on my 350.
Exhaust valves sucking oil when going down hill.
I found elsewhere that the 350 has small valves,
Has anyone sourced a larger valve for the 350?
Since I have a spare head why not go for a bit
more flow for better performance too?
Mr Le Feesh
Odd that you suggest "exhaust valves sucking oil" - why is that exactly
Changing valve sizes is a world of pain that only leads to a series of on-going engine spec changes.
Easy performance gains are available with a little careful porting and a slight rise in compression.
If 500cc power is what you're after then the cost and time effective solution is to buy a 500cc bike at the outset.