The way I did it was...
-Turned the knob "counter or anti clock wise" until it stops - lots of clicks.
-Turn the knob clockwise, Count the clicks as you go to the end.. I counted roughly 40 clicks...
-Turn the knob back,"counter-clockwise" 20 clicks and stop, This is a good starting point. Now, If its too soft, turn towards the firm.
Next adjustment should be 10 clicks, Either to the left or to the right, then 5 and so on... Adjust to feel.
On a performance motorcycle shock , The knob is a "Rebound" adjustment.
-"An adjustment that controls how quickly or slowly the shock snaps back into its extended position after hitting a bump"
"F" is for fast.
"S" is for Slow.
On the sportbike and mountain bike, I like my adjustment all the way to slow and back off a few clicks to keep the bikes from bucking.
-The dirt bike I like a little bouncier, so I adjust it to the "F" or Fast range.
Now the bad part,
I think the performance shock that came on the Blackjack is different, It is a NCY but the website offers no info.
"F" May mean "Firm".
"S" May mean "Soft" ... Which is opposite
I am having a hard time finding any adjustment info on these shocks.
I have the shock on my blackjack set at 20 clicks.
I ride a winding brick road to work and its a jarring ride at 40 mph.
I'm going to set the knob 10 more clicks to "S" In hopes of taking out some of the sting. If its too soft go 5 clicks to firm.
If the ride is still harsh, I'll grab the spring and twist it clockwise to soften... 1 turn at a time. A little go's a long way.
- You don't want the ring on top of the spring to "EVER" come off.... Don't ask me how I know.
If you weigh more than 160 lbs.
1 or 2 tighter turns on the spring couldn't hurt.
Notice- You don't want to go too soft or you will feel it in the handling, Wallowing = easy to lose control.
- If you are bottoming out you need to tighten the spring accordingly or get a heavier spring.
Good Luck
