G'day Brock,
and thanks for replying, now this is not hard but this is my problem, I built an ST1100 powered Morganesque Trike, 2 front 1 rear with an automotive style drive shaft, it's two piece with 2" tube.
The spline on the engine output is in my opinion too short, way shorter that the CX500, so at 100kph the front UJ vibrates which means I need a support bearing but that's no go on a 2" tube.
However the ST1300 had a much more simple drive shaft than the 1100 and I could modify one with a support bearing and stop the UJ flapping around, but will a 1300 shaft UJ fit onto an St1100 engine output spline, that's all I need to know, see pic
Cheers Joe.