need jetting help
- Thread starter clharris
- Start date
When I ran my 600 twin I found that it liked 140's or 137.5's at that altitude. I think if I'd have had the yamaha jet that's half way in between it would have been perfect as the 137.5 were a bit lean when it would cool of a lot during the day. Needles in the top clip with one washer under. Pilots were 55's I think. Obviously if your temps are real extreme one way or the other you'll need to tweak things, but this should get you close.
try the 138.8. 52.5 on the pilots. lighten up the tip weight on your cam arms, use the aluminum 2.7 gram rivets in both holes, if your running 8CR weights. shoot for a 2:1 ratio on gearing, 20/39. scott
Fuel screw I think was 1.5 turns out, but that will depend on your motor as it's a fine adjustment to get perfect.
Clutching I ran the 8 CR's with a 3.6 in each hole. Doing it again I'd run a 2.7 in the tip as I was just under on my rpm's. Y-S-Y short spring seems to ring a bell. May have been a G-P-G. It's been a few years and my notes are at home. I ran a either a 45 or 43 helix/ green spring @ 70.
Clutching I ran the 8 CR's with a 3.6 in each hole. Doing it again I'd run a 2.7 in the tip as I was just under on my rpm's. Y-S-Y short spring seems to ring a bell. May have been a G-P-G. It's been a few years and my notes are at home. I ran a either a 45 or 43 helix/ green spring @ 70.
my notes have the fuel screws at 2 turns out. you know what a ***** is is to adjust these if you dont have remote adjusters. heck, its a pain with the remotes.
