Originally Posted by
pcook99
Hey Max,
How would you measure head clearance?
What would you recommend as an upper and lower limit for shims? eg. .2 to .4?
Did you modify the orion so that it had .65 mm of shims?
the Orion had stock 0.65 between piston and button...I didn't change anything yet
I suggest test n tune and run the engine as tight as it will allow you to run it... first sign of trouble is a hanging idle that won't tune out..different fuels and conditions play a big role in what the ideal head clearances are .