You can get the jets from Dennis Kirk in sets of 2. They can have their tech dept look up the corect style for you.
The quad is very very sensitive to the jetting....You shouldn't have to go past a 75 main jet.....try 72.5 and a 75. We live in FL and use a 75 main jet and the clip is the 2nd from the top on needle.
To tune the main jet on the carb you need to run the engine on top end and increase the main jet size until it breaks up (not the same as cutting off from lack of fuel...more of a stumble) at full throttle and then back off the jet size. This is how I was told to do it and it has worked out perfect for setting the main jet (I am no expert)....If anyone has any other ways please share them with me...I am always looking to learn something about these bikes.
Also check your plug....Once you start modding the stock plug is way too hot....We run a BPR7HS.....
We have a national port kit from PR
Racing in Ohio, run Castor 927 premix 40:1 w/93 octane fuel, CT Kit (exhaust pipe/intake UNI and K&N), wiseco piston kit and all restrictors removed, plus the snow hog/douglas setup.
The bike runs great and starts with one pull everytime!!
Still if you want to go fast this is not the bike....kind of like banging your head against the wall....It will run against the other bikes now, but not so good when you compare the investment. IMO
Once we get the 06 DRR DRX50 the green machine will be for sale....No suspension to speak of on the KFX......
I must say it is a quality quad, just not the fastest or best handling....but for a "mini" 50 it is nice.....Most of the other 50s are so much bigger that a little guy can control them well enought to learn.