WR 450 Dyno run.

21 replies to this topic
  • MrBlahh

Posted June 09, 2004 - 04:59 AM


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

How many people here have had them fail?

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  • Rich_Rohrich

Posted June 09, 2004 - 05:28 AM


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.



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