ZXR 400 dynojet problem

There seems to be more and more members appearing that are racing the ZXR400 so i've created a special section just for you to show off results, discuss meets etc etc.

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Posts: 1
Joined: Sat Oct 17, 2020 7:48 pm
My Bike: ZXR 400 L9 track bike

ZXR 400 dynojet problem

Post by belmondo666 »

Hi guys.. I have a problem. I have installed DYNOJET Stage 1 on my bike as per the instructions. The main jet 96 and the needle on the two groove from the top, fuel composition for 2 turns, floats for 11mm. A motorcycle up to 7000rpm is screwed in by rotation, while already over 7000rpm the engine stops and does not screw in, shoots from the silencer. I set the needle to the last notch and a little better, but still this mid range has too much fuel in my opinion. What do you think about this? I don't know if it makes sense to change main jet 92, or just go back to the original needles. :smt017 :smt017 cgeek :smt017
Posts: 2
Joined: Tue May 10, 2016 5:24 pm
My Bike: zxr 400

Re: ZXR 400 dynojet problem

Post by Hecki »

use the oem needle, the dynojet stainless steel kills the brass needle seat.
with aftermarket exhaust, air filter or stock, use 92 main jet. bike run lambda 0,9-0,95 i measured with LSU 4.9 o2 sensor.
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