Wondering what clutching and jetting to run with the twin pipes. I know slp is usually off a bit in jetting not sure on the clutching. It has the flowrites and the slp airbox mod done already. I think the previous owner to me had slp stuff to a T in there. Thanks for any possible help. Also, how much do the 600 ves sleds respond to porting. THanks, Blake

Start by running only 3-4 sizes above stock for main jets, no need to go as rich as they say. Needle middle clip. 64/42-.46 helix, black secondary spring. Almond/blue primary spring, and 10-62 weights. Run it at 8000 rpm.

Should be similar setup on my 660 except maybe 64gram weights? I've been running 66's wiht almond primary to 8100rpm. I should have my twins in 2 weeks or so. I hope they aren't to to quiet.