Erik,
The chains driving the 2 speed unit are 1/2″ x .205″ and the sprocket supplied to you
measuring 5.1 mm is .201″ giving .004″ clearance.That’s OK.
I think silver soldering parts of the big end assembly was a mistake as the temperature
required to s/s will have softened it nicely.
The final drive chain dimensions are 1/2″ x 301″
If the rivet holes in the flywheel are worn it’s possible to open up the holes to take 7mm
diameter rivets.
Laurie.
