That's the best way to ruin the cranks and a downshift by mistake to the wrong gear when not paying attention can do the job real quick from the shock load.
Bubbie, It's not the RPM that hurts or scissor the crank. It's the sudden stopping (or attempt at stopping) the Hi inertia flywheels. Any RPM can scissor a crank. If the bike is going 40 MPH and you accidently drop it into 1st, you will scissor the crank BEFORE the flywheel reaches its terminal RPM.
Doing 5000 RPM then dynamite the rear brake
signed....BUBBIE
Then someone asked me if I had seen the heavy self-adjusting shoe system in My 09 FLHR bike... Stating"Now,Heavy built and okay to use high speed to slow bike down"... No, was my answer, as I only saw the New Unit in a breakdown in the HD Book.
signed....BUBBIE
Does this look really heavy duty ?:small3d007:
07 Primary Chain Tensioner Pics - Harley Davidson Community