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Dreaded zing sounds more like a tooth to tooth engagement. Just like the fiat, the trans is out of the way and the starter ring bolted to the back of the crank is an inspection call. Do I replace the ring and stater gear and this was the zing was a too far out was the static point?
I'm very-very confident you can do this if a fiat was a piece of cake. This is more theory-inspect-spec-meguyveereversengineering. My theory says to rub both hands together, which one stayed cold? My 2 contact points made contact, LI, which one did not evenly wear out as if both hands evenly began to warm up you could not tell who, but worn/warmed evenly it is.
Why, flywheel the flip of the tooth like a sprocket can be installed two ways. I flip my flywheel and starter gear. See the stuck in the desert what do I do scenario no start?
So first thing I'd look for is a lot of metallic in the primary. Those 2 contact points are evenly eating at each other and there has to be a powder or tiny enough chips to warm the bike up and drain that oil onto a clean paper sheet. If you see the oil sparkle... Get it?
Next is the nose is as far as you can go so this is where you jam clay at the back of the clutch basket to ring-tooth. You have to manually install the starter again, push the shaft inside the starter manually. This jams the nose into the clay.
Remove the starter and see how deep that starter sits now? And this is just one of 2 variables I can think of off the top of the head.
1. Starter ring gear wear.
2. Amps is I need more P is the battery. P is power to keep the amps from collapsing or can't lock that push to the starter ring and mechanically lock it magnetically full throw. If there is not too much more left in the battery to keep the amps in that pushed position, then the amp-hour rate is not in the range and all that low battery is moving the shaft back?
3. I doubt it, so say I'm wrong times 3. The full throw of the starter was yeah, fully locked and the throw is all she wrote. How deep in shimming was that engagement? Was it too shallow and now here is the problem?
Understand that dual scenario where do I look first?