what causes the engine to "groan" while sand riding?

Joined
Mar 28, 2000
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#3
If you are running a paddle tire, then that is probably what you are hearing as it digs into the sand, and the vibrations reverb through the frame of the bike, you can probably feel it too. Paddle tire or not you are putting a big load on the engine running in the sand so it could very well be the clutch. If you are not running a paddle, get one it is soooo much easier.:D