Again, if you got a good one it is still going, if not, you would know.
Anyhoo, the first 391s had what seemed to be assembly issues and component quality control problems. These issues would happen very quickly, not caused by fuel, dust, etc.. These were not one off issues,
Fasteners would snap the heads off while during use, starter might fall off, etc.. Broken threaded part stuck in case, etc..
Stub end of crank might snap off during use, clutch or flywheel bounce around busting up parts.
I saw the carnage of three flywheels that came apart, severe damage. At least one minor injury, happened during out of the box check and tach test. Crank would be intact, not to be reused. These went back to VB, supposedly.
Flywheel nut might come off, spin the flywheel. Clutch might loosen, lock up. Both would damage parts.
Busted pistons. Busted cranks. Missing parts. The list goes on.... They were crap.
The 362, very similar list, not as many units affected.
The first 661s were a bag of dicks, pick something that could go wrong and it did. I suppose the handles were well made, and fitted.
The 661s issues were handled the worst, they sat and sat at dealerships waiting for resolution, always blamed on a lack of parts. The others were for the most part quickly taken care of.