Join Date: Feb 2007
Location: Berkley, MI
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There are three adjustable support zones to the snow on a sled. 1) the skis, 2) the front of track and 3) the rear of track. Adjusting one zone stiffer will reduce the weight on one or two of the other zones.
If you have the same XTRA-12 as mine, the main adjustment is for rider weight affecting the rear of track. Unhook the rear suspension coil spring's front/ long end from the clip and adjust the block at the rear/ short end of the spring. Turn the block with the spark plug wrench to a higher position for heavier riders or stiffer rear suspension. This is much easier with the sled on its side. Don't forget to tighten the gas cap and oil tank cap if tipping. Too stiff here will give a bumpy ride and not allow full stroke or travel of the rear suspension. Too soft will allow rear to bottom out. Adjust so you bottom out slightly only on the biggest bumps.
The rear suspension has a front "coil-over-shock" spring preload adjustment. Compressing this spring more will stiffen the whole rear suspension and remove weight from the skis. When this zone is too stiff, the rear of the sled tends to fishtail more.
The rear suspension also has a non adjustable rear coil-over-shock. You can remove it to soften the rear suspension for really light drivers.
The ski suspension has adjustable preload on the left and right springs. Turn both adjusters equally to compress the springs giving more ski pressure on the snow and a higher and stiffer front end. When this zone is too stiff, steering effort is too hard (too hard to turn handle bars). When this zone is too soft, steering effect is lost (skis don't steer well, under-steer).
If you have the adjustable damping shocks, you can adjust the damping effect of the ski shocks and the front coil-over-shock. There are three turns on the screw with full out being the least dampened or softest, adjust half a turn at a time.
Let me know if you want info on the FRSS and limiter strap adjustment affecting weight transfer.
Just to make sure, there are two shocks on the rear suspension but only the front appears adjustable? And more preload would be tightening and compressing the spring more right? Also, I noticed a screw on the bottom of my front ski shocks and I was wondering if it is just for bleeding/charging or if it is an adjustment.
Note: The Xtra 12 121" track suspension is slightly different than the Xtra 12 133.5" track suspension. 121" shown.