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Message: [QUOTE="reepicheep, post: 1372416, member: 104942"] Cool! That wasn't hard at all. Start with the low speed jet, which is 1/3 throttle, and tune that. I had a 48 in there, clip 2nd from the bottom (richer). Air fuel screw 1 turn out (in is richer, out = is leaner) Warm it up and do 1/3 throttle pulls. Then turn fuel air screw out 1.5 turns (out = leaner). Ran better at 1/3 throttle. Then turn fuel air screw out 2 turns (out = leaner). Ran better at 1/3 throttle. At the same time I tried full throttle pulls (I know you should only do one thing, but if you look at the Boyesen charts, the clip and slow jet and air screw supposedly have no effect at WOT). I had a 155 main in there, and it was a choppy pull at WOT. I knew that before, I had a 152 in there, which did well with the stock expansion chamber, but was running choppy with the FMF Gnarly Woods pipe. So that made me believe the main was now lean (as a result of the new better pulling exhaust). So I pull the carb, and move the clip to the middle position (moving it up one notch, moving up is getting leaner). Leave the 48 slow jet. I also put the stock (160) main back in. Restart, re-warm up, and it was great! 1 turn out on the fuel air screw, 1/3 throttle, ran pretty good. 1.5 turns out on the fuel air screw (leaner), 1/3 throttle, ran even better. 2 turns out on the air fuel screw (leaner), 1/3 throttle, pulled a little worse. Sweet! Looks like that is dialed in. WOT pulls hard. So here is where we are... I think I have the low speed all dialed in. Not surprisingly, it is right where Jeff Fredette, Eric Gorr, and FMF said it would be ;). For the main jet... 142 to 155 (going richer) pulled harder. 155 to 160 (going richer) pulled harder. My guess is that 160 is about perfect, but to know for sure I would have to put a 165 in there and feel it get worse... there aren't any other nice hacks like for the low speed jet where I can use the fuel air screw to tell what side of perfect I am on. A 165 main would be richer then anything else I have heard of anyone running though. It's richer then the high end of what Fredette, Eric Gorr, and FMF recommend. So that seems insanely unlikely. So I'm guessing I should just leave it at a 160 and enjoy it (it runs great until it gets too high an RPM and gets off the pipe, then it gets choppy). So that's my experience. It wasn't that bad. The Boyesen guide that comes with the 607's was extremely helpful. Now to get an actual full day ride on this thing... the bike is getting dialed in about the same time my knee surgery is being declared "fully healed and ready to be re-injured ;) " [/QUOTE]

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