So, like I said, just received an email from Matt;
“So I did a bit more work on #101.
As I was rolling it through the shop, I noticed a faint click every so often. Checked the chain as it could be a stiff link but no, chain is good. So I removed the chain and just spun the counter shaft sprocket and I could feel a little 'skip' every so often.
Not being a believer in things scabbing over and healing by themselves when it comes to bikes, I removed the entire primary to get a closer look. With it removed, I found nothing external that could be the cause so next I took the entire gear box apart.
At the very last gear (4th), the lay shaft gear had a broken off tooth !! It was laying in the bottom of the case. Clean break, no metal fragments or oil contamination.
So I replaced the 4th gear lay shaft and sleeve gear (4th main shaft) as a set.
Gear box and primary is all back together. You now have a freshly gone through gear box. A bit of a bonus.
Always an adventure”
I hate to think how this could have all turned out, yikes!!!
Yet again Matt comes to the rescue and further proof, not that any is needed of course, that his reputation is so well deserved.