Hi Bill, my crank has .002" runout on the timing side mainshaft, it could do with being a lot smoother running. Tony Maughan always reckoned .0005" max runout for a smooth engine. Cheers, Stu.
Ah the real world ! Stu, I always aim for perfection, But never get it.
The standard Vin crank is not the best in the world, People have been trying bigger pins and press fit with no nuts for years, My L/ning was so smooth when I first built it, But after it's first race, Not any more !.
If I can get .002 on my 560 Comet, I will be thrilled to bits !!.
I know you liked Bird Watching Stu, But what about Fishing !!, I asked Dear old Big Sid from USA about vibration, And he told me a trick about putting 1/4"or was it 3/16 ths, lead weights up the handle bars, He could tell a good story but I thought it's worth a try, My vibes were around the 65/ 70 mph ish and it's much better now, I think it was before you were on the Forum.
Another good trick is to drill and fit a small roller, Half in the flywheel and half in the main shaft, So the shaft can't turn. Cheers Bill.