Hi, I recently bought a kit from you for my sons 2005 YZ 125, I just installed it last night, and will put the wheel on and set the sag tonight. Couple questions, does your link come lubed, or should I hit the grease fittings on it and fill it up? When lowering the forks, they must already be lowered as the top of the fork is just about touching the handlebar , don’t suppose there is any trick there in lowering them any more? Just don’t want it to ride too high in front. Any other set up tricks? He is a 14 year old and weight is 140 lbs with gear on.
The YamaLink comes pre-greased and should last for years if your son does not ride in a lot of rivers or hits the pressure washer directly on the bearings.
If your forks are slid up already they are fine. RESET sag, dial in the high-speed compression and rebound, and then think about moving the forks if need be. There is no 1:1 ratio of fork vs rear lowering because changes to the rear effect geometry at a much different rate than the front. In fact, 6mm (.25 inches) is a lot of fork moving when compared to 1.5 inches in back.
Follow the instructions. Try 100mm sag and then think about 94mm sag and going in on high-speed compression in back.