WR 450 Dyno run.

Wow, this is the first I've even heard of gearbox failures on WR's

How many people here have had them fail?

what did you use to build up the floor of the port?

Hamish - You can find a two part A/B epoxy putty in the Moroso catalog that works really well for doing intakes port floors. I've had it running in a number of 1340 Evo Harleys, and a handful of old singles for years with no failures. IMO, metal prep seem to be the key to good adhesion. Proper pre-cleaning is critical, and in a high vibration environment like the Harleys I usually channel the floor and preheat the head to 120F to give the epoxy something to grab onto when the head cools and contracts.

The epoxy hardens to a grindable surface so it can be reshaped to get the proper short side radius. It's a really nice product that is easy to find at speed shops.


Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now