Adjustment Front Fork
The forks are adjustable in both spring preload and rebound (return).
Adjuster 1 alters the spring preload.
Adjuster 2 alters the hydraulic rebound damping.
rear Jack 
Inspect the chain for:
1ЎўDamaged rollers
2ЎўLoose pins
3ЎўDry or rusted links
4ЎўKinked or bound links
5ЎўExcessive wear
Replace the drive chain if it has damaged rollers, loose pins, or kinks that cannot work. Always keep it lubricated and clean
Check the front and rear sprocket for excessive wear or damage .If necessary, have your dealer replace a worn sprocket.
If play s 20mm tighten the chain as follows;
1ЎўLoosen nut A on both sides.
2ЎўAct on screw B to retighten the chain.
3ЎўMove the same screw on the opposite side to the position of the previous one.
4ЎўCheck the wheel alignment
5ЎўRetighten nut A as the same way.