Has anyone jetted their 07 TRX 250? I recently jetted mine and don't seem to be getting any much performance boost. I am thinking I don't have it tuned quite right. I had to go with the 102 jet because I was getting some sputtering at full throttle with the recommended 106 jet. Any help would be appreciated.
Thanks,
sidewinder

 

put a 97.5 and shim the needle jet also add a k&n and amr rev box

i put a full custis sparks on my kids

your not going to see big gain out of that motor

 

how do I shim the needle? It came with a washer. Should it go above or below the c clip? Also, the kit recommended the 4th slot on the pin. BTW, I got a Moose power up kit with the K&N filter. It seemed to run a little better with the airbox lid off

 

First of all THANKS for your quick help. This is a better way to ask my question. I will try the smaller jet. THe washer is above the c clip as per the instructions. Does shimming mean lifting the pin up? Can the washer go under the c clip? And, how much does the air/fuel mix effect it?

 

mine didnt have any c-clip so it had to be shimmed

your just putting and airfilter on if thats it i would just go 1 size bigger on the jet and do nothing to the needle

did your kit come with a key to adjust a/f it should be at 2 1/2 turns

 

The needle that came with my jet kit has 5 slots for a c clip to slide into. The directions specify which slot according to elevation. Above 5000 and below 3000. I am below 1000! I don't know how much difference elevation makes. When you shimmed your needle, did you put a washer below it?(between it and the top of the slide)OR above it (between it and the plastic retaining ring with the spring?) I am assuming below. This may sound like a dumb question but does a smaller number (on the jet) mean a larger jet? for example, my instructions told me to install the jet #106. I was having symptoms of running too rich. so I switched to the jet #102. It solved the richness(flat spot at full throttle). But it does not seem like the performance was effected very much at all.
yes it did come with a tool to adjust the a/f mix. and 2 1/2 turns it is. I was wondering if that because I am so low in elevation that this might not be an accurate setting??? I am going to try the #098 today (no 97.5 in my kit)and see what happens!
thanks,
Sidewinder

 

you have dyno jet jet and there numbering isnt the same...this should help you alot

http://www.exriders.com/vbb/sh...ighlight=dynojet+sizes

 

You either jet for the lid on or off. Your not going to see any power increae without adding more air and more gas. I stay away from Jet kits and just get OEM jet from your dealers parts counter. If I remember right it took a 112 main jet to get her running right. Just remember it's a 250 and your never going to get her to run like a 400.