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.
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If I have to take the carbs off once more...