270 Degree Rephased XS65 - Hugh's HandBuilt

Thats right folks, we finally built a 270 Degree Rephased XS650 Engine

Ok, here comes the flood of emails, questions, etc... So I'll just quote Wikipedia for the reason to rephase an OEM Firing Pattern of 360 (which is the stock XS650 engine configuration) to a 277 or 270

"The classic British parallel twins (BSA, Triumph, Norton, AJS & Matchless) had a 360° crankshaft that, compared to a single, gave twice as many ignition pulses, which were evenly spaced.

The Yamaha TRX850 had a 270° crank that allowed a more regular firing pattern than a 180° crank, and less regular than a 360° crank. This configuration has the best possible secondary engine balance for a parallel twin; its exhaust sound and power delivery is identical to a 90° V-twin." - Think Ducati or Suzuki SV Series engines

While we do a TON of 277 engines (it's the most cost effective rephase for the XS650) this one is 270 degrees. I've always wanted to build one. It requires a specially made center pin for the crank ($$$$$) and 2 donor cranks to build a single 270 crank. Then the camshaft and ignition must also match the new firing order of course.

What you see here, is a 750cc 270 Degree XS650 Engine, using JE Pistons, our HHB D-Shaped Ported Head, 5th Gear OD, HHB 6 into 7 Clutch mod, 5th Gear OD, HHB Oil Cooler and all the other little tricks we do at Hugh's HandBuilt

I hope you enjoy it. Go find our Blog, and check out the other cool things you can do with these bikes. They are a blast to own, mod and work on.

Hugh

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