Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)
HRC Works bike crank
sandblaster:
This is the HRC RC500 snap-ring crankshaft that is talked about in my book "Legendary Motocross Bikes." These cranks are tunable for different power-band characteristic's by altering the rotating inertia. Steel, tungsten and nylon inserts were available and gave the tuner the flexibility to adjust the power-band simply by changing the weights. The process to change the weights is very simple as they are held in by snap-rings located in the crank flywheels. This along with all the other available options that HRC offered, made the RC500's some of the most competitive motocross bikes ever produced. Ask any factory Honda rider that ever used one of these crankshafts and he will tell you this was the biggest improvement on the bike. Even though the crank flywheels look like they are made from billet, they are actually made from several machined pieces that are hollow in strategic areas and then electro laser welded together. Very few of these were made and the cost was well over $10,000.00 in 1980's dollars.
PJSMAN:
Has anyone ever seen this done ....outside of Honda HRC ?
mun:
If you change the HRC crankshaft weights, you should split the engine.
If you do weights holes in the outer edge of the crankshaft, so you only need to take off the cylinder. Easy.
It's my 5 cents.
Bad picture, but you see the principle.
RoostiusMaximus:
hrc weights could be accessed in the ignition housing and clutch case :wink:
sandblaster:
--- Quote from: RoostiusMaximus on October 17, 2013, 09:57:58 AM ---hrc weights could be accessed in the ignition housing and clutch case :wink:
--- End quote ---
Pipe plugs or freeze plugs?
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