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Don't need a cam driven ignition. I made mine with a double cdi ignition. 83° rephased heritage special. Just connect up a second cdi plus a second pickup coil 83° earlier on the housing. Works perfect together with 2 coils of an Aprilia rsv1000. These are very small, and powerfull, and fit snug...

You're right! I made a high level 2-1 for mine, with an oval racing silencer(laser/booster) of a dr-big, and it sounded awesome!

Sorry, mate, don't know the definition. Love tinkering with engines. Always room for improvement. Long-bang 4, crossplane 4, without innovative thinkers, we'd never have those. 😜

Indeed, crossplane is good for a V8, not an inline four.(a 270° twin imo isn't a crossplane crank, because it is L-shaped from the side) An inline four should be rephased to two pairs(L+R) of 180° twins, that in turn are 90° out of phase to each other. Like Helmut Fath did with his URS engine...

I rephased an xs 15 years ago, to 277°. Big 750cc block on it, reworked head and cam. Ran great for years, and many miles, and happy smiles. Wanted more, so i sold it to an xs enthousiast, who loves it. I bought myself a Triumph Thruxton 1200 R, which i absolutely love, and it has the...