Hi and Welcome!
Quote:
Originally Posted by NinjaRacer
HI.
I got 110 keihin main jet and it was bogging down at 8K. I'am on 98 again and 2 washers it runs much better.
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Please note that optimum jetting for new-gen vs. pre-gen bikes are
>> COMPLETELY << different. This is due to differences in tuning with pre-gen optimised for high-end power while new-gen for mid-range torque. Cam-specs are different, head port shapes are different, exhaust are 2-2 versus 2-1. This creates completely different flow-pattern from idle to redline. Jetting for pre-gen will not work for new-gen.
When dealing with jetting changes, look for before-and-after dyno-charts to verify what changes it made to AFR in what RPM-ranges. Here's some reference articles:
Racing on the Cheap - scroll down to "The Nuts and Bolts" section, note: "close to perfect" is with full AreaP exhaust and factory jetting.
Racing Order - Dyno testing
Dyno testing full AreaP exhaust - still too-rich high-end, lean mid-range only - thinned needle to correct.