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Drz400 sm speed wobble6/10/2023 ![]() I've had the bike down to frame and didn't see any distortion or tweaking. I've owned the bike since March, it's something I've simply lived with. Is this simply how the bike handles? I mean it IS a street legal dirt bike, and the rake angles aren't that decent for street to begin with.Ĭould I have the tops of the forks showing too little? I saw in my service manual that the S model has a rake of 27 degrees, 10' and the SM has a 26 degree, 15' rake. ![]() I greased and torqued the steering stem to spec when installing in April. I bought the SM wheels thinking it was just an aggressive DT21/D606 tire issue. If I'm going faster, roughly 30/40mph+ it doesn't have the issue and travels straight. There is no middle ground, either slightly left or slightly right. When an average piston speed of 4000 fpm is exceeded, the risk of component stress failures increases almost exponentially. Longer stroke engines have higher average piston speeds, and therefore, lower rpm thresholds. The primary variable of this formula is the engines stroke. It wants to go left or right as if it's riding on a tightrope, or on the edge of a razorblade. There is a formula used to calculate the rpm that equals 4000 fpm. I've noticed at lower speeds, such as a 20mph school zone, the bike has a tough time going in a straight line. I've had the 21"/18" set up since I bought the bike with conventional forks. I've got a '00 DRZ400S with an '08 SM fork swap and '15 SM rims.
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