Quote:
Originally Posted by toomanytoys2
The clearance rule that I go with is kind of a 60 / 100 rule. Typically you want 0.060" clearance between the intake valve and the piston and 0.100" clearance for the exhaust valve. As far as the valve spring, clearance before coil bind, 0.060" is a good number, and you want to make sure that you have around 0.090" of clearance between the valve spring retainer and the top of the valve guide.
Most of my engine building experience has been with the air cooled VWs (30 years) and dirt bikes, and these guidelines have served me well (not for 2 stroke though  .). The A12 is a fairly mild grind, so if you can get your numbers in these ball parks, you should be fine. |
Thanks for your help as soon as I p&p it I will do all the clearence test thanks!