checked the timing on my cub motor tonight, i thought it was on 4, come to find out is was only on +2.. i bumped it up just a hair pas 4. what do you guys think?? will it make that much difference?? i have heard that they like a lot of timing.. its a stock stroke 68m, 33mm pwk's, vforce, and 20cc domes, 93 octane.. i also have it jetted a little rich , ..