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Canadian Daves JustKDX
KDX 250 known for lack of top end ?
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[QUOTE="GhostofSilverider, post: 1410164, member: 121135"] My KDX 250 (SR model recently bought used) feels to me like it lacks a bit of top end power . The restricted stock pipe was opened, and it has an aftermarket silencer, the packing sounds good to me. This 91 model is in this setup probably similar to the enduro model of that year. First gear in particular tops out very quickly (gearing is stock) , in that gear it sounds like the valve is not opening or as though I have water in the airfilter, in other gears the bike runs well, but I am disappointed with the power when the throttle is wide open, it just doesn't keep going like a good motocross bike, the engine sounds like it's about to have a heart attack and I don't like to stay wide open for very long for fear of seizing. This is with a jetting that was way too rich (piston black and wet, spooge leaking) but I have recently removed the airbox cover and installed a Twin air filter (which btw is slightly smaller) , it now feels a bit more responsive but no improvement on top end. I am not too keen on playing with the jets as I heard this bike is finicky , next step for me is moving the needle and playing with the airscrew. But that won't improve the top end in first gear I suppose. The bike has 1300 miles and is otherwise in exceptional condition, a valve issue is probably not on top of the list I would say. My last 250 2 stroke was a new Yamaha YZ back in the 90's, and I recall the engine was very smooth yet ripped at the top end, it never sounded like it was about to seize. Is this behaviour normal for a KDX 250 ? [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
KDX 250 known for lack of top end ?
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