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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Is my dealer crazy?
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[QUOTE="CaptainObvious, post: 730686, member: 17060"] Don't bother looking at a used plug. I can tell you right now it will be black. You want to read a new plug that hasn't had a lot of idle/mid throttle time on it. What transmission do you have? Half a gear too High :think: If the bike bogs and then pulls strong (at WOT) that is a sign of rich jetting. Once again, to be clear, we are not talking about a bog as you roll on the throttle, but at WOT. A lean main jet starts off strong at WOT and looses its hit. Caution: if it's too lean it will cease the engine. Yes, 45 is leaner than a 48 due to less fuel. Turning the air screw in (to the right when viewed from the top of the screw) does richen the pilot circuit. Tune this circuit for best throttle response. Look at your bike as a system, not this thing makes it rich and this thing makes it lean. Jet for what you have, not what you think it should be. Choose a pre-mix ratio (32:1 is good) and leave it alone. Your pre-mix ratio has little to due with a smokey exhaust. A rich mixture (gas/air) is what usually causes a smokey tail pipe. With that said, before you go chasing the jetting, make sure you have a clean silencer and air filter. Air screw first. You decide on the correct pilot jet based on throttle response from adjusting the airscrew in and out. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Is my dealer crazy?
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