On the small racing quads like DRR and APEX, the rear variator spring plays a big part in overall tuning of the quad. The most common way of identifying the spring is by the numbers on the coil of the spring like 1500 RPMor 2000 RPM. The problem is that not all springs of the same RPM range have the same pressure for reasons like spring fatigue, different wire diameters, or wire types. This makes tuning the rear variator more of a trial and error or a guess. We have developed a rear variator spring tester that takes the guess work out of rear variator tuning. It has a 0 to 200 lb gauge +/- 2% accuracy (with optional gauges available) and can be used in a vise, press, or everyday drill press. This is a must for the serious tuner. This gauge also works well to test slipper clutch springs.
This tool can be purchased at http://www.recmotor.com/rectech-tools/
ATV & Scooter ...This tool can be purchased at http://www.recmotor.com/rectech-...