KDXRIDER.NET

Against better judgement I decided to give the JD Jet kit a run. Received the kit today (so not yet installed) and have some real questions. I had always heard the "jetting instructions" were great and figured this would be a reason to try the kit. That is a joke. The instructions tell you how to install the jets in your carb. If you don't already know how to do that, I don't think I would be screwing with tuning it anyways.

Following the listed recommended setup I would install the following:

RED needle in #4 clip
165 main (for sea level to 3000 ft)
does not specify on pilot jet

This seems way rich. I have a PC complete exhaust system and the air box lid removed and I think I'm rich now (too the point of having spooge running down the silencer) with I think a 155 and stock needle in the #2 or #3 clip. It just seems like the recommended setup is going in the wrong direction. Am I missing something here. I do a lot of very slow riding following the kids around but still have "rich signs" when riding with the buddies at high speed. Does the RED needle make that big a difference with all the other circuits when compared to the stock needle? What say you'll.

I really like the blue needle: http://www.kdxrider.net/forums/viewtopic.php?t=11913

I do agree that the suggested main jet would be too rich for me. But my jetting has always been a little off from regular KDX bikes. I ride 700-1000 ft and my main is a 155 and my pilot is a 40. I've always assumed it had something to do with the KX airbox flowing differently.

Tedh98 wrote:I really like the red needle

What clip position did you settle on?


I know the RED needle is leaner than the BLUE; however, does anyone know how these two compare to the stock R1174K Kawi needle?

I put the wrong color needle in my 1st response to you. I made the correction to the BLUE needle.

My bike ran best with Blue in the #3 position.

The changes from Red #4 to Blue #3 to Red #3 are more dramatic than I expected. I guess the good part of that is that it makes it pretty clear which is the best combination.

Since JD is providing main jets, I would take a guess that he is suggesting very rich jets as the starting point to be on the safe side. Since every bike is different, I would think he'd rather start everyone off too rich to avoid someone claiming that his suggestions ruined their engine.

That is what you'd want to do if you were jetting on your own.