I found out about the tiny filters the hard way, so I thought I'd pass it along. They sort of slip inside the carb hose barb up against the engine block. What a pain to get to, but they don't seem to clog if you are religious about draining the bowls. I *DID* get my motor for cheap because of them, as it wouldn't run right until I fixed it.
So far, mine has been well behaved otherwise- no water pump issues as long as you run it on muffs, the valve lash seems to not wear. I did replace the 14 year old plug wires, and that cured a miss. My mechanic friend says there is a not so well documented accelerator pump that jams. I do have a little bog, but I have never set the ignition advance device properly- the one that works off the throttle cam.
Mine runs ok on E10. It likes non ethanol a bit better if it is really cold out.
And I learned my lesson and run good oil. Marine oil or VR1 with the extra zddp. One year, my non marine oil looked awful after some hard running in July in Buzzards Bay.
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