Thursday, August 25, 2011

Marc's WR250F WR450F spring rate and sag for lowering YamaLink

Yamaha WR UK rider Marc writes "I weigh 13 st 6 lb hope to be able to set up suspension to suit."

After Googling the conversion from stone to pounds we replied.....

I believe 13 stone 6 lb is about 187 pounds in the US measurement. With the stock setup you are fine at 187 pounds and should be able to set your suspension up with 100mm sag.

With the WR250 and WR450 YamaLink and its extra leverage we take your 187 pounds and ADD 10% which is 18.7 pounds. Total weight you should spring your bike for is 187 + 18.7 for approximately 206 pounds.

To get perfect balance and handling I recommend going UP in spring rate for the rear to a 5.6 kg/mm spring to achieve the great handling and not have excess bottoming and understeer.
You can try to reset your sag with the stock spring and the YamaLink but I
bet you'll have a difficult time getting anywhere near 94mm to 100mm.

How to lower the WR 250R WR250X shock mount

We presumed every dealer knew about this. We thought Yamaha WR250R and WR250X riders knew about this from online forums. So we took the tutorial off our site. Maybe we should put it back up since we've had a few calls this week about "how to lower the rear that other inch other than the YamaLink.

It doesn't take an hour. Maybe 15 minutes. Okay, more like 10.

Dean's Yamaha WR250 lowering link question about sag

Dean, a WR250R/X rider, emails with.....

"I guess I do not understand why one would loosen the Lower Shock Block versus adjusting the larger threaded flange nuts at the top of the shock assembly. Also, assuming I follow the prescribed method, should/can the Lower Shock Block be loosened until it won't loosen anymore, or is there a risk of the entire shock assembly coming apart? I am 170 lbs., 30" inseam."

Our reply.....

Threaded nut flanges at TOP of shock allows spring to be loosened or compressed for sag only. The shock mount nut at the bottom allows the shock block/clevis to move up or down ONLY. Has nothing to do with sag. The shock mount should come in the most "loose" position from the factory. Riders are moving it UP to lower it. You move it up until it almost contacts your black rebound dial.