Hectic testing session...
Started with a normal garage session.
First, checked the valve clearances. They were closer to .07 than the .05 they should have been, but I was only checking to make sure they were not less than that. Figured I would not adjust them yet.
Then tested idle using the battery from yesterday without charging it first. She started and ran a solid idle for 10 straight minutes.
Would have swapped the carb but only now realized that the gas line is not only on the left, but angles DOWNWARD! Would make for a very awkward fuel line.
Decided to just take it on a run. Immediately got the slippage issue. Did two laps that way and then boxed.
Changed and went back down for garage session #2. Started off by draining the oil, then removed the exhaust and foot pegs to get the clutch cover off.
Found that the oil filter was almost clogged by a combination of gunk and also metal shavings!
Had intended to just swap that clutch for the one from the model engine, but ran out of time, so just brought them back up for inspection. Good thing, too...
Took the clutch apart upstairs and it was DEMOLISHED! The friction plates were fragments. So mystery solved.
More concerning was that the clutch outer cover was very badly scored. That could have explained the noise I'd been hearing at first (which disappeared once it was worn down.) Also explains all the shavings. That can't be good... Hope the filter caught them all.
Took apart the pin-type clutch from the model engine to double check it. Friction plates were 2.5mm and looked in good nick. All the big springs were exactly 26mm as they were supposed to be. Stole the little outer springs from the new eBay auto clutch. Should be good to go.
Need to check what it was that scored the clutch outer cover and if it caused any damage internally.
Also, don't forget to add OIL!!
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