Cycle News is a weekly magazine that covers all aspects of motorcycling including Supercross, Motocross and MotoGP as well as new motorcycles
Issue link: https://magazine.cyclenews.com/i/127128
AT REST Fork movement isregulated by the amount of fork oil metered through the factory engineered orifices in the damping system. These orifices are specifically sized based on weight. geometry and anticipated usageof each motorcycle. Fork oilselectioniscritical toinsure instant and predictable damping " response regardless of speed. II temperature or ground < I • ...,- ~ surface. Consistent . viscosity in all weight ranges. seal conditioning. anti-wear additives and antifoaming agents are prime . factors in choosing the proper COMPRESSION fork oil. Compression damping forces are designed to balance fork compression speed with the obstacle it encounters. Small obstacle: Oil moves in and out of orifices quickly. without resistance,providing a smooth uninterrupted feeling. Large obstacle: As the fork continues to compress. oil is quickly , forced through the orifices. rapidly , ... building hydraulic resistance to Jr slow the fork and minimize bottoming. Consistent fork oil viscosity is the key ingredient that can smoothly absorb the slightest impact or rapidly increase resistance for the unseen REBOUND obstacle. Fork oil viscosity directly affects the return of speed of your fork after compression. The objective of rebound damping is to maintain tire contact with the ground. insuring traction and steering control. Although the factory has engineered a pre-determined return speed. variables such as rider's weight, terrain and temperature make custom tuning a necessity. Only PJ1 fork tuning oil is formulated to maintain a consistent viscosity. It makes fine tuning a simple process. am ala ' udea m recomme PJ1 Forti Oil" Mike Burlingham, President o(Cycle Co nservation Club of Michigan Years Riding: 17 Current Mot orcvc les; Honda XR350 . BMW WORT "Optimum off-road handling Only PJI makes a consistent requires maintaining tire contact with viscosity fork tuning oil. Try it. The the constantly changing terrain. You difference will amaze you. Available at don't want any surprises from your better dealers everywhere. " suspension system. Riding in Michigan, To order, send S2.75 plus S1.50 where the daily temperatures can vary . postage and handling to PJI Corporation 30 · or more, my bike's handling World Headquarters changed with the temperature. Stiff in 8340 E. Raintree Drive Scottsdale, AZ the morning, spongy in the afternoon. "My dealer told me the problem USA, 85260. was my fork oil and recommended PJ1. He explained that unlike other fork oils, PJI is enhanced with special pour depressants to maintain a consistent viscosity, through a wide range of temperatures. The first time I used PJI fork tuning oil, I could feel the difference. For more than five years now, no matter what the temperature or terrain, my ride is totally predictable.". . . .-Il ,