Has anyone changed valve springs in order to increase rev limit to 7000 rpm? How did you overcome the ECMs rev limiter? Any other modifications?
07 XL-50 #870 Stage 1
06 VRSCR "Hyper-fast Touring"
Kansas City Missouri
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My ignition has adjustable rev limit, but I hate to rev my motor past 6500 and even that makes me cringe. It's the thought of the piston speed that worrys me. How often do you want to rebuild your motor?
I don't think you need to change the valve springs to rev the engine to 7K rpm. I think the stock valve train can safetly rev to 7K rpm. If you look at the SE catalog they have a chart where they put in SE E cams and increased the rev limit to 7K rpm without changing the valve springs.
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The XB's have a 7K rev limit stock. I would think the motor can handle it.
Don't forget the XB's are a different animal. You guys can correct me if I'm wrong but I think the Buell's have a lighter flywheel asembly and the stock valve trains are different that a Sportster's. So going to 7k with one is easier.
I think that if H-D thought a stock Sportster could go to 7k they would of allowed it from the factory. Performance bike selling point, yes? I know that the SE ignition lets the motor rev but I'm sure they felt that the usage of that unit would be for modified motors not stockers.
Plus I have to agree with Lager why would you want to rev a stock motor to 7k it's not like it's going to make any more power. If you are racing you try and shift within the power band not outside of it.
2004 Vivid Black 883 Custom, CONVERTED With NRHS 1212 Cylinders, 10.5 to 1 NRHS Dome Pistons, Stage 2 NRHS 1200 XB Heads, SE .551 Cams, TC88A, All the Right Stuff