Tech Tips!

by Jonathan Teraji

Fox Shox

O.K., guys and gals, lot's of questions about the Fox Shox, so here goes........


Compression Damping: Compression (bump) adjuster is the red knob on the reservoir. #1 postion gives minimum compression damping, and #8 maximum. Start with position on #4 and go from there.

Rebound Damping:There is NO rebound damping adjustment. Contrary to the literature that is supplied with the shock, this is NOT a "Twin Clicker" shock. Why? Simple...$$$ and size limitations. Think about it. The actual travel of the shock at the bottom mount in reference to the top mount is 1 inch. Now hang on, the rear wheel the travel is considerably more due to the fact it is attached to the shock by a big lever, i.e., the swing arm. If you would like to have Fox, or any company build a shock that only has one inch of travel with both compression and rebound, prepare to pony up mucho dinero. My guess would be in the neighborhood of $600. This of course assumes that the company thought they could sell enough to make this endeavor a worth while project. So.....Fox chose the more important of the damping considerations when designing the shock...Compression damping. (FYI: the two othere companies that have built YSR shocks in the past have neither compression nor rebound damping adjustments, in spite of what their literature says)
Spring Rate: O.K., let's clear up another YSR shock myth. How many spring rates are available for the YSR shock? ONE SPRING RATE. So what's the deal? Fox has combined in one spring their "#2 (140-180lb) and #3 (180-230lb)" rates. Therefore, the spring works for riders from 140lbs to 230lbs. Repeat, One spring only available for the shock. Do not be fooled by Fox Springs on YSR shocks that are different colors. There have been two colors only since 1989, orange and red. These are cosmetic, as chosen by Fox, differences, not spring rate differences.
Preload Adjustment:

Please note arrow from rear axel bolt up

Set preload or sag for 7/8"

1. Put motorcyle on stand or jack, (NOT under swingarm) to fully extend swingarm.
2. Pick our reference point directly above rear axel bolt. (Use a seat bolt, turn signal or any fixed point). Measure the distance between the axel bolt and the reference point.
3. Have rider put on all riding gear and sit on the bike with feet on pegs in riding position. re-measure the distance.
4. The bike should Sag right around 7/8".
5. If bike sage too much, add tension to the spring, if not enough decrease tension.

Bottom Bushing: We have nocticed that the bottom bushing on the shock tends to fatigue after a while and now have a replacement, non-fatiguable replacement bushing in stock.
Pressurization:Hey kids don't try this at home! The shock is pressurized to 300PSI! (This could hurt you) Nitrogen is the gas of choice. We recharge all our shocks once a year. (By the way, if your local shop can't do it, we can. It's cheap. Turn around time is 24 hours.)
That's it! Not going to get invovled in some big intellectual discussion of suspension on the YSR, suffice to say Fox Shox has been the only company to actually develop a good reliable shock that actually works, and fits the YSR. On one of our street YSRs we are still running the 2nd shock they ever made, circa 1987, and on our race bikes we are running various Fox Shox from many different production runs. Hope this has answered some of your questions.

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