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Just installed a set of thundershift arms on an '02 MXZ 800 X. I really like the way they pull. Smooooth. The problem I'm having is that when I pin it, the RPM's shoot right to 8000 (perfect, right?), but then as the track starts to hook the RPM's drop to about 7400-7500 RPM's, then in the next 100 ft or so they climb right back to 8000 and stay there for the duration. I didn't have time to move weights around much and didn't figure out the magic to it. I have 10gm pins, 8.4gms in the first hole, and 6.4 gms in the bottom hole. Running a 52/46 helix (stock is 47/44). Not remembering right now what the spring is. I'll locate it later.
Anyone have the secret for getting these dialed in? I'm thinking too much helix for the start. Or I just am not moving the weight around right.
Anyone have the secret for getting these dialed in? I'm thinking too much helix for the start. Or I just am not moving the weight around right.