Join Date: Nov 2001
Location: Santa Clarita, CA
Motorcycle: 99 GSXR 750
Re: Kibblewhite Titanium Retainers
Stronger springs are good for high RPM and high lift, or if the overlap is very tight. It will make sure the valve closes fast enough to not damage anything else.
Too stiff and you will loose power because it will be harder for the cam to push the valve open.
Lighter retainers make for less moving mass, in effect making the spring have to do less work for the weight of spring. So better valve movement.
That is the basics anyhow... I am sure a LOT more detail into why could be put up, but I dont think it is needed.
99 GSXR750, yosh full race pipe, TRE, Tail light int., 180 rear tire, Almost Illegal Racing suspension, -1 front +3 rear sprocket, flush mount turn siganls, cut fender, 55,000+ miles!!!, Brembo Radial master, 4 pot brakes, balanced crank