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Old April 24th, 2020, 06:51 PM   #1
ssrsupermoto member
Name: Brad
Location: Zanesville Ohio
Join Date: Mar 2020

Motorcycle(s): 2004 Ninja 250

Posts: 74
Dyno Jet kit help/questions

Anyone else using Dyno Jet stage 1 jet kit and find that it runs way to rich. I bought it and did the stage 1 which by the manual says stock air box and filter (Iím using drop in UNI filter) and stock or slip on exhaust (running stock mufflers at the moment) Eclip on the needles 4 slots down from the top, 2.5 turns out on the Air fuel screw, drilled slides with supplied drill bit, and used suggested main jet from the Dyno jet instructions. This Dyno jet kit uses stock pilot jet. So far I can tell itís running rich you can smell how rich it is through the exhaust.

Prior to this I have all stock carb components and had 1mm shims under the stock needles, 2.5 turns out on the air fuel screws. Ran great.

But this Dyno jet kit has ruined how this bike runs. Just want know know if anyone has experience with the Dyno Jet kits and what you thought about it. Valves were adjusted, Carbs were syncíd, set float height wet and set to the base of the carb body prior to installing jet kit.
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Old April 24th, 2020, 11:01 PM   #2
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On all jet kits i’ve used, i’ve always ended up with smaller-than-stock jets after dyno-tuning. Down one size on race-bike with full-exhaust and down 2-sizes on street bike. The needles provided does richen up mid-range, so some richness with stock-sized jets can be expected. You’ll want to dyno-tune or used wideband-O2 with data-logging to really dial it in.
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Old April 30th, 2020, 04:33 AM   #3
ssrsupermoto member
Name: Brad
Location: Zanesville Ohio
Join Date: Mar 2020

Motorcycle(s): 2004 Ninja 250

Posts: 74
I ended up using the stock pilot and stock main jet with the Dyno Jet needles in the 4th groove from the top and 2.5 turns out on the air fuel screws. I had two sets of slides so I drilled one set and for street riding the drilled set sucks. I put the stock non drilled slides back in, I would say if you had a straight race bike then your would want the slides drill but not for a street ridden motorcycle.
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