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Are you over riding the bike? Sometimes early in the day when I’m trying to ride the shit out of my bike my upper body goes. If I push through the fatigue eventually later in the day my riding will adjust and I can run full motos at the same speed. I’m just flowing instead of trying to man handle.
Is your steering stem nut too loose? I've found that loose front end forces me to grip the bars too much, and fight to keep the bike tracking straight in the rough stuff. Tighten that steering stem up. Put the bike on the stand with the back tire touching the ground and tighten the stem just enough so that the bars never fall to one side on their own, regardless of their position. You don't want to make it too tight where its noticeably hard to turn the bars, but just enough to prevent them from moving on their own. Be careful not to go too tight as you could cause reduced bearing life. An even better option would be to install a steering damper.
This, paired with just overall better fitness and more riding time, has helped me out the most with armpump issues.
Pit Row
Post a reply to: Upper body/Arm fatigue while riding