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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Twice the size jet?
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[QUOTE="Dogz, post: 708271, member: 45914"] Duner I really think you need to learn how the circuits on a carb work. My 92 250 will spooge if someone is just putting around on it, wind it out and it runs clean. It is a 2 stroke if you don't ride in the powerband, the pipe and port timing can't work together and you get a lot of unburned fuel left in the pipe. You posted this very thread a couple of weeks ago and got pretty much the same answers. You need to independantly tune each circuit of the carb, begin with the air screw, then do pilot, then main. Tuning the main you'll need to do both the jet and needle. After doing the main & needle you'll have to go back and recheck all the circuits again, Do lots of plug chops to make sure you don't burn it up. Check out the tech tips for a very comprehensive article on carb tuning and operation. Maby you should take it to a shop if your really not sure what your doing. A couple hours shop labour to set up your carb is a H**L of a lot cheaper than doing a complete top end cause you screwed up the jetting. If you think you can do it start by tossing in a 40 pilot, fire it up tune the airscrew, go for a short ride and see how the idle to 'bout half throttle reacts, If it better but still rich go for a 38, then smaller if you have to. ONLY CHANGE ONE CIRCUIT AT A TIME, you can't tell which change helps if you make three at once!. Now tune the main remembering the needle controls things to about 3/4 throttle, and just the main from there up. Of course changes to the needle will effect the upper range of the pilot circuit. Everything effects everything else in a carb. This is all asuming your reeds are in good shape and you compression is within spec. It's almost impossible to tune a worn out engine!. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Twice the size jet?
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