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Old 01-14-2013, 05:16 AM   #3235
Lenz1
Gnarly Adventurer
 
Joined: Jul 2010
Location: Queensland Australia
Oddometer: 141
Quote:
Originally Posted by Zecatfish View Post
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.
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