Iâ€™ve been reading about the changes Yamaha made to their 2004 RX-1 to make it corner flatter. I ride a 2003 RX-1 and didnâ€™t care for the abrupt tip-up on a friendâ€™s RX-1 when he installed a stiffer sway bar. Are there any adjustments I should be/could be making to my sled to get it to corner flatter? My sled is still very stock right now, I donâ€™t believe in re-engineering something that Yamaha spent so much time at making the way it is.
Weâ€™ve had excellent results installing a set of Ski-Doo dual runner Precision skis on our Yamaha four-strokes, as Ski-Doo offers a specific kit which allows their skis to be installed on your sled. The wider effective ski stance does wonders for overall sled stability.
Yamaha also has provided some tuning tips for requests like yours. Assuming your sled is calibrated per OEM specs, lengthen the front ski springs by two full turns (decrease the preload). This provides a lower ride height and increases the stabilizer bar preload. If youâ€™re not sure where these springs are set right now, they should measure out to 258 mm with the shock unloaded. This change increases the length out to 261mm.
Also very helpful is to replace the stock (10mm) lower control rod shims with 5mm ones. This will reduce what we call â€œforward weight transferâ€ (weight transfer to the front of the sled during deceleration) and allows the machine to maintain flatter cornering. These are the white plastic shims right in front of the rear axle wheels, on the bottom side of the transfer rods.