[Manic]

I think I finally found a permanent solution to the rattle found in Kartboy style short shifters. Previously, I had been applying grease inside the shifter where the reverse lockout spring was and this would do a decent job until the grease inevitably squeezed out. I'm not sure if it's the same on the Kartboy shifter, but on the DNA Motoring clone, there appears to be a small hole where the reverse lockout housing is pinned to the mechanism and grease would start to push out of it.

Now I've been sure that the rattle has been coming from this spring having too much slack against the inner walls of the shifter and the resonant frequency from the transmission was making it rattle at higher RPMs. I decided to take the spring out and put some heat shrink on it to snug up the fit. I've covered about 2/3s the length of the spring and it gives it just enough diameter to snug up against the inner walls.

I've been running it this way for a week now with zero rattles.

P.S. The DNA Motoring clone has held up perfectly for the last 3 years with no issues apart from the rattling!