StephenRC45 wrote:Honda say none of the RS cranks cane be rebuilt, however we are able to supply all the bearings and seals for the NF5 range and a good number of parts for the NX5 and NXA. Things like big end rollers, seals, cages and bearings etc can all be replaced and serviced rather than buying new cranks.

We can often true the cranks to even smaller tolerances than HRC supply them new. In the passed we've even had Arrow rods made for some NSR/RS cranks.

Hi - your statement above that Honda say RS cranks cannot be rebuilt and that you are able to supply all of the required bearings & seals...and that big-end rollers, cages etc can all be replaced rather than buying a new crank has me very, very surprised and intensely interested.

Just so you are aware - Honda (HRC) used to have a crank-rebuild service for all RS model owners where you could send them your used cranks and it would be returned to you fully rebuilt and balanced! I have personally used this service for an RS250 and RS500 triple. I admit it was quite some time ago and Honda ceased the service after 5 years as at the time, the Japanese Yen was not competitive against most currencies so it was more cost effective to buy a crank rather than have it rebuilt.

Due to the extreme shortage of NF5 cranks, I have been researching crank parts availability for quite some time now (5+ years). RS250 cranks can be rebuilt and rods, big-end rollers and the bearing on the ignition side can be sourced but the main issue is sourcing the inner labrynth seal as well as the next-to-impossible to obtain, primary drive side outer bearing pictured below.

My research finally took me to the primary Japanese supplier of bearings and seals to most of the Factories. They have a significant amount of 'surplus to requirement' bearings and seals that suit the NF5 range of bikes but here's the choke-point........
The parts are made under license so they cannot release them for retail sale until receiving authorisation from the Factory. I managed to get a reply to many letters sent stating it would require legal department consideration but I've yet to get any further reply regardless how many times I chase it up..

So may I please ask......Are the parts that you source OEM or after-market? Can you source the clutch side bearing that has the orange nylon insert (Pic below)? If you are not using this bearing - are you experiencing bearing 'skip' in the cases?

Your assistance in giving me some indication of parts and availability would be greatly appreciated and also provide me with some closure on many quiries I have been chasing.
Thank you!