Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
I would expect there to be specifications in the shop manual for ride height..... that would be the first place to check IMHO.
After that, talking to a suspension shop about it would be the best course of action. You could also check on a suspension website and see if they offer any advice, there are also on line magazine articles which describe proper setup -- I think SportBikeRider has done a comprehensive list covering near 20 years of bike models...
Very few Japanese motorcycles are sold with springs which are appropriate for riders who weigh more than ~ 150 lbs. Odds are good, whatever is in there is likely not the optimum choice to begin with.
If you can, I would recommend raising the bike back up to the OEM height, and while you are at it add in springs that are of the proper rate for your weight. Whilst doing these things, it's always a good idea to refresh the fluids in the fork, as they become contaminated over time and change viscosity -- that will hose up the damping rates, which are what fine tune the response from the springs.
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