Dynojet-kit J-model

[sjoeblom]

I have a zxr750J and it runs very poor under 3000 rpm.
The carbs are clean and no leaks between carbs and cylinderhead.

I disassambled the carbs and the main jets are 140 dynojet - ALL 4 !
Is this not a problem , the std is 132 (1+4)/138(2+3) ?

I'm not very familiar with dynejets, can anyone tell me if this can work or I need to find a std. set of main jets ??

[Metalhead77]

Maybe you´ll get further Informations from Micon Systems

http://www.micronsystems.de/" onclick="window.open(this.href);return false;

They also sell invidual jets.

[sjoeblom]

I wil try that.

But doesn't anyone have a dynojet-kit in a J ?
What size jets do you run ??

[FP91]

In dynokits not only the mainjet is changed, also the needle and idlejet too. If you like to change back to standard, you need to replace all.

I run standard 132/138.

[sjoeblom]

pilots are #38 as STD ??

needles have 6 groves where the clip can be placed and 3 rings above the clip.
size of main states #140

in my opinion this is to large for a std. J-motor - any ideas ?