[Jme250RA]

I just ordered springs and emulators from racetech! This is the first, and probably most important, mod I'll be making to my bike. While I was using the spring rate calculator I noticed the stock rate is 0.490 kg/mm. I'm 180 lbs and the spring rates for my weight were 0.80 kg/mm for street use and 0.85 kg/mm for track use. I went with the 0.80 kg/mm because if I want to lighten the bike ie. muffler and battery, then the suspension will get a little tighter. I can also adjust a bit more by playing with different oil weights. It should make a world of difference.

 

[Jme250RA]

I was a little surprised at the change in springs at first also but then I rode the bike and I think they are right. The bike is sprung way too loosely stock. I can't sit on the bike without losing an inch of travel and the suspension soaks up so much of the braking and accelleration energy. I guess I'll find out in a couple of days.

 

[Jme250RA]

I got thinking about the stock spring rate and wondered what rate 0.49 kg/mm is for but the calculator on the Racetech site only goes down to 31 lbs for rider weight. Even then the spring rate is 0.596 kg/mm. The weakest spring they sell is a 0.70 kg/mm and that is for a rider that weighs in at around 110 lbs! I'm guessing that the stock springs were put in just to keep the bike from falling over while on the kickstand.