Hi Guys just built my K1, and it sounds like a bag of nails. All electrics are new so now dirty motor or and grit ect in the car. The noise is coming from the Mesh on the spur pinion. the spur looks to have very blunt teeth it doesn't look to mesh well at all. It looks like the Spur gear has been poorly machined or cast.
If one plays aound with the mesh it will quieten down but not as quiet as one might expect. I think it is down to the Shape of the teeth on the Spur.
Its only doing laps round the living room at the moment.
So is it a case of needing a RW gear?
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