FCR jetting 06+
Ok Im baffled by this one. I have never had such a bad jetting issue before. I thought I had a gearing issue after I played with the jetting previously, and was at 13/36 but still short shifting so I went to 14/38 and then 14/39 for a bit more torque. But the reality is Ive come to realize after my glamis trip that its jetting related. It feels like Im hitting the classic false rev limiter issue at more than 1/2 throttle
Whats happening is I need to short shift and 3rd was fairly unusable. I was screaming in 2nd the entire trip, trying to go to 3rd was only an option if we were flying-any other time it would fall flat on its face in 3rd. Quad is stock besides ported head, stage 2 hot cam, open air box, uni, boyesen quick shot (edit) full dasa exhaust, 14/39 gearing. Jetting is currently 160 main, 48 pilot, ncvq needle 3rd notch and quickshot adjusted to 55 leak jet.
I did have a 165 main in there ncvq needle 3rd clip. In the morning when it was cold (45-50f) it was better but I was still short shifting, seems the last 1/2-3/4 throttle hits that false rev limiter. As the day wore on and got hotter to about 70F it got worse of course. I swapped to a 162 and better, then 160 and it was better but still needed to short shift. At night the header glowed way to much for my liking but by this point it was the last day. Before I messed with the jetting the quad would fall on its face if you tried 3rd and werent booking it, would have to ease into it or scream in 2nd to get the power and stay there.
Im at a loss here, I did the quick shot on a friends 450 and it had no issue. What else could it be or should I be playing with the jetting more? Less leak jet? The boyesen quick shot instructions state: 1/4 turn of the screw is #25 leak, 1/2 is #35 leak, 3/4 is #42 leak, 1 turn out #48, 1 1/8 is #50 and 2 2/4 turns out is #55 leak.
Quads being shipped back to me in 2 weeks so I cant really mess with much till then however
-2004 450R. Far From Stock.. Sold, crank was going
-2006 450R. New WHIP..
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Last edited by CJM; 02-17-2019 at 10:34 PM.