Saturday, April 30, 2011

YZ 125 lowering and what to do with the front forks

As for the front: our super simple install instructions gives a starting point and some guidelines for raising the front forks based on personal preference and final rear sag setting. There is no 1:1 ratio since changes to rake/trail affect the geometry at a different rate than changes to the rear suspension. After lowering the YZ 125 suspension in the rear we recommend a starting point of about 4mm when sliding the fork tubes up in the triple clamps.

WR450F suspension spring rate with YamaLink lowering

Murray rides a WR450F and weighs 220 pounds, and he wanted to know about proper spring rates:

"The 2003 WR450F has a stock spring rate of 5.3 kg/mm. At 220 pounds (before gear) with the STOCK setup the spring rate for your weight is a recommended 5.7 kg/mm.

With the YamaLink's extra leverage the spring rate for your weight is 6.0 kg/mm

With proper sag you want the WRF to bottom just once or twice per ride but I know for a fact at your weight and the stock spring you are bottoming a lot more, the bike may understeer and you have too much sag. This is happening with and without the YamaLink because the 2003 WRF comes sprung for a ride weighing around 180 pounds."

Setting up WRF Yamaha suspension lowering link kit with YamaLink

Ty, a WRF rider out of Montana, asked for setup tips when installing his YamaLink.....

"I'm 5'6" with 30" inseam. Weigh about 165 lb. Anything you want to recommend before I start the install would be great."

Our reply.....

"I'd follow the simple install instructions which are included, and set you sag at around 94mm for starters.

Turn the shock's high speed compression (the big knob at the top of the shock, not the flat blade) IN clockwise about 1/4 turn for starters. Then turn in your rear shock's rebound (flat blade at bottom) a few clicks IN.

Slide the forks tubes up about 4mm. Test ride. Make adjustments to rear first. Then fine tune. You'll notice a huge increase in traction and plushness over the square edge and braking bumps. Your main goal is to only have the rear bottom once or twice per ride. You also want controlled rebound due to the extra leverage."