Lean pilot jet? - Yamaha R1 Forum: YZF-R1 Forums

00-01 R1 Mechanical Help Mechanical and Critical Issues for the 00-01 R1

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post #1 of 3 (permalink) Old 09-15-2008, 06:53 PM Thread Starter
I eat my R1
Join Date: Aug 2008
Posts: 121
Lean pilot jet?

I have a 2001 r1 w/ a full d&d exhaust and I think it is a little lean at low throttle. When I take off, the engine just doesnt seem to pull like it should untill I get past 1/4 throttle. also if i under rev it it doesnt seem to recover untill I get past 1/4 throttle. it has the stock 15 pilot jets, can I richen this by turning the air screws?(or is it a fuel screw on these) If so what way do i turn them?
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post #2 of 3 (permalink) Old 09-17-2008, 03:19 PM
Join Date: Mar 2007
Location: AMSOIL
Posts: 797
Part of the problem is the full exhaust, you took out the EXUP valve which is what is needed for low RPM power. It's in need of some good tuning. A number 17 pilot and 132.5 main might be a good start. I would call Ivans for his neddle.

The mixture screw is for fuel. start with it about 3 turns out. Turning in is lean out is rich. Also drop a tooth on the front to help recover from low end bog.
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post #3 of 3 (permalink) Old 09-17-2008, 04:18 PM Thread Starter
I eat my R1
Join Date: Aug 2008
Posts: 121
Thanks for the info r1slapper. Other than ivans, is there anywhere i can just buy 4 size 17 pilot jets?
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