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Old October 11th, 2019, 05:06 PM   #23
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Quote:
Originally Posted by vtrider View Post
#4 which I think is a Dynojet needle

I posted another reply on this thread but I think it's getting reviewed because there are links in it.
Interesting... those came on Stg2 kit and were designed to add some fuel in mid-range and remove in high-end when doing K&N and full-exhaust. Maybe without all those mods, you're getting too much fuel in mid-range.

Plugs look OK, very rich, certainly not horrible. Stick with factory specs of 0.030-0.032" for gap. Maybe 0.035". Not sure how much more factory coils can deliver. Here's plugs from my '09 street-bike and '08 race-bike after back-to-back 20-minute sessions @ Thunderhill. Factory-jetting completely coated plugs with carbon with +9.0:1 richness (beyond rich-end measureable by wideband). Race-bike with snorkel-delete, K&N, Tyga full-exhaust and DynoJet Stg2 kit with 96 mains.

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