I'd try loaning a motor first, either a Checkpoint or an Orion. The Reedy KR's are very inforgiving and require lots of maintenance to keep then running well in my experience. I gave up on them some time ago as they just ate brushes, they were rapid, but only for 1, possibly 2 runs then they needed new brushes.
I reckon it's the KR that's letting the side down. Are you sure your speedo is hitting full power too ? Does the transmission run smooth without the motor in too, i.e no binding ?
Andy.
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