2moto

Innovation on 2 wheels

Norick Abe YZR-500 Replica

Find out more

The spiritual successor to the RD-350

Find out more

95Racer: 95bhp and 95kg

Find out more

Norick Abe YZR-500 Replica

Find out more

The spiritual successor to the RD-350

Find out more

YZR-500 Frame Kit

Find out more

The spiritual successor to the RD-350

Find out more

Login Form

Latest Updates

Search

NC35 (RVF400) cush drive conversion

Running the TZ350 close ratio gearbox in the RD350 engine without a cush drive made us a bit nervous. As the NC30/35 swinging arm hub doesn't incorporate any kind of cush drive, a solution was needed. The goal was to be able to use standard sprockets so that sprocket replacement and gearing changes would be straight forward using off-the-shelf parts. We looked into using a Triumph and VFR800 style cush drive, but didn't like the bulk of it. Plus, it wasn't going to be a straight bolt-on conversion either. So, after a bit of thinking, we decided to produce a new part, a "spider" that would hold six cush drive rubbers and bolt onto a revised standard NC30/35 sprocket carrier.

The cush drive rubbers are Honda RS125 parts. While the RS125 uses only three cush drive rubbers, we decided to use a full completement of six for longevity reasons. Plus, the standard sprockets have six mounting holes. The spider is small enough in diameter to accomodate down to a 38 thooth sprocket. Here is what the complete cush drive conversion looks like.

And here are the piece parts:

  1. The cush drive spider
  2. The modified NC30/35 sprocket carrier
  3. The sprocket with the cap head bolts to locate the cush drive rubbers
  4. The six nuts bolting the assembly together

And finally, this is what it looks like assembled on the bike. Hopefully, this will be adequate protection of the gearbox internals.