| Yes the guides are mostly left in while working. I grind the guide down flush in the intake port. On the exhaust side, I grind about 4-5mm off the guide and trim down the aluminium around it. Some guys do grind the exhaust guide right down too, but I don't like that. The guide is the only way the exhaust valve can rid itself of heat. These motors already run very hot, especially in the exhaust region.
Last edited by Mack : 13-01-2008 at 01:05 PM.
|