Originally Posted by Hesky

OK, I've just got my factory mod d5r motor and I'm just about to break it in, does the engine have 3 shims already fitted (0.1,0.2,0.3mm) lookin at the exploded view on the manual it lists 3 different shims am I to assume all 3 are already fitted giving it total of .6mm spacing or should I just take the head off and look myself?

0.6mm spacing, a hot plug and 10% fuel sound like a good setup for breakin in? what sort of oil content should the fuel have. soz just dont want to screw this process up

also the manual speaks of this 'star technique' for tightening up the head screw. what is this technique?

I bet my lack of nitro tuning knowledge is really showing through

Cheers
Hesky