Backfire/coughing

[MartyNZ]

On 7/1/2025 at 10:07 AM, bzane said:

... Like an aged cush drive so I bought new rubbers and will drill them and install when I next change tires.

I drilled half of the pucks in my bike back in Mar 2018. Six drilled pucks, with the remaining cavities empty. The difference was barely noticeable, but I liked the idea of lowered shock loads on splines/gears/dogs. I have not felt the need to revert to standard over the last 6 years.

An odd effect of rubber is that it does not compress much. If you squeeze it, it will bulge out somewhere, without the volume changing (Poisson's Ratio for rubber is 0.5). This tells me that the pucks will be cushier if they could squeeze somewhat, and squirm in in their pockets easily.

Dry lube in the puck pockets is helpful, and Klüber Staburags NBU 30 PTM grease (or equivalent) on the rear wheel drive spline is essential.

 

Edited July 3 by MartyNZ

[Kiwi_Roy]

I would also check that you're not losing Voltage through a dirty ignition switch that happened to my VII Sport

cleaning and re-lubing the switch fixed that.