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/126997
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 usage of each motorcycle. Fork oil selectioniscritical toinsure instant and predictable damping I response regardless of speed, ~~~I temperature or ground , ""I surface. Consistent viscosity in all weight ranges, seal conditioning, anti-wear additives and antifoam ing agents are prime factors in choosing the proper COMPRESSION fork oil. Compression damping forces aredesigned to balance forkcompression 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, rapi dly , __ building hydraulic resistance to Ir 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 mu dea recom e m PJ1 ForM Oil" , :\like Burlingham . President of Cycle Co nse rvation Cluh of Michigan Years Riding: 17 Current Motorc-..c les. Honda XR.3S0 . BM'l' IOORT "O ptim um off- road handling Only PJI makes a consistent requires maintain ing tire contact with oi scosity fork tuning oil. Try it. The the constantly changing terrain. You difference will amaze yo u. Available at better dealers everywhere. - don't want any surprises from your suspension svstern. Riding in Michigan, To order, send S2.75 plus 1.50 where the daily temperatures can vary postage and handling to PJI Co rp oration 30 or more, my bike's handling World Headquarters changed with th e temperature, Stiff in 8340 E,Raintree Drive the morning, sponb in the afternoon. 'y Scottsdale, AZ _-; , = ...., " My dealer told me the problem USA. 85260. : :: ===i -~.mIL!! was my fork oil and recommended PJI. ..,._ .. He exp lained that unlike other fork oils , PJI is enhanced w ith special pour depressants to maintain a consistent oiscosity, through a wide range of te mperatures. The first time I used PJI fork tuning oil, I co uld fee l the difference. For more than five years now, no matter what the temperature or terrain, my rid e is totally predict able." 0