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/127119
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. Forkoil selectioniscriticaltoinsure instant and predictable damping esponse regardless of speed. temperature or ground 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 te 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 ~ 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 gl mudea recomme PJ1 ForM Oil" "Optimum off-road handling requires maintaining tire contact with the constantly changing terrain. You don't want any surprises from your suspension system. Riding in Michigan, where the daily temperatures can vary 30 · or more, my bike's handling ch anged with the temperature, Stiff in the morning, spongy in the afternoon. "My dealer told me the problem was my fork oil and recommended PJI . He explained that unlike other fork oils, PJI is enhanced with special pour depressants to maintain a consistent tnscosity , 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 rid e is totally predictable... Mike Bur li n ~ h am. Presiden t o t Cvcle Co nservation Cl uh of Mich igan Ye ars Ridi ng: 17 Current .\ Io w r'·...c les: Honda XR3S0 . BMW WORT Only PJI makes a consistent viscosity f ork tuning oil. Try it. The difference will amaze you . Availab le at better dealers everywhere. To order, send S2.75 plus S1.50 postage and handling to PJI Corporation World Headquarters 83 40 E. Raintree Drive Scottsdale, AZ _ USA, 85260.