1) Thanks for the advice Robert but the impulse part of the mag seems to be working just fine (and why would it cause a problem at low crank RPMs?). I've tried shifting the timing probably a good +/- 20 degrees all to no avail. As for 'wet' plugs after repeated attempts - no they aren't, but read on...
2) I like you 'back to basics' advice jimg, but I don't think fuel and/or spark are the problem - compression on the other hand...
3) ...seems to be an issue. Much to my surprise the only cylinder that pushes my thumb off the spark plug hole with a lot of force was the one I was most worried about - #2 with the custom-made valve holder! While that gives me confidence that my repair to #2 cylinder was a success, it makes me wonder what's up with the other 2 as the engine was running fine before cylinder #2 swallowed that exhaust valve.
I'm going to try adding a tablespoon of oil to cylinders 1 and 3 to see what happens - if there's no obvious compression change I'll assume the exhaust valves on those 2 aren't sealing properly and then have to figure out what, if anything short of tearing the head off, I can do about it.
Dr.sportster: do you have an eBay account if I decide to take you up on your offer?
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
... [Read Article]
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