AJS/Matchless Lightweight Gearbox Overhaul

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Ream the layshaft bush to size

If you fitted a new layshaft bush, check the size. It should be reamed to 0.6255-0.6260".
The layshaft measures up at 0.6235", so by my reckoning that's a running clearance of at least 2 thou.
An adjustable H6 hand reamer (19/32" - 21/32") will do the job.
Don't worry too much about getting the size precisely right; just open up the bushing until the layshaft turns freely. Slightly loose is better than too tight.

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