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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Kdx 200sr
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[QUOTE="kipmax, post: 157001, member: 24680"] Well, the SR expansion chamber and cylinder uses a bolt down flange while the R model uses springs. You may be able to find an after market pipe specifically for the SR (we have many here in Japan) but I went with a R model Pro Circuit pipe that had been hanging on the wall of my friends bike shop for years :) I had to cut off the stock pipe's flange and weld it to the Pro Circuit pipe. I could have had an adapter flange machined and attached with springs but the bolt on type makes for a better seal (no black gunky goo oozes from the exhaust port). With minor jetting adjustments the bike runs very strong (as strong as it can with a 28mm carb...) Before I located the Pro Circuit pipe, I tried modifying the stock pipe by removing its inner wall and baffling material as described on the Just KDX pages. Note.... This does not work for the SR!!! :scream: The SR pipe has much heavier noise reduction and a larger diameter outside wall. You will end up with a KDX that runs like an RS125 road racer (screams on top, nothing in the middle and down low). Well, the SR does vibrate a bit more than some of the other Japanese "Dual Sport" two strokes simply because it is so closely related to its racing brother (no balancer shaft, rubber mounts). However, if you feel it may be extreme you may have bad crankshaft bearings... :( Mine did when I got it. It had been ridin mostly on the street and probably spent a lot of its time in the upper RPM range. It also had about 23K kilometers on it. Pull off the generator cover and check if the cavity is black, wet and oily. If so, the crank seal is letting fuel blow past due to the bearing's wobble. You are looking at a major overhaul in that case. If you can rebuild it yourself, the parts are not much of an expense. However, good luck in spliting the cases! Mine felt like the had been welded together! Hopefully your vibration problem lies somewhere else. Make sure you check all the engine mounts for tightness too. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Kdx 200sr
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