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Hey Bill – Thanks for the info! That rubber cap, part #27, has gotten so hard, I thought it may be rubber coated steel. The hardness of it may be causing it to bind up on the brass part #23 that has to slide through it.
I noticed a subtle thing about the design of the carb. It appears that each time you use the choke, a small amount of gas/oil mix stays behind to lubricate the choke’s piston where it slides in the carb body.
The farther I look, the more small things I’m finding – like somebody put the wrong carb mounting gasket on that did not have a cutout for choke fuel to pass through from the carb to the engine. I think I can finish the carb now and then move on to the next problem which is why the mag plate moves so hard to advance the spark. The only reason I’m sticking with getting this piece of junk working is that the owner came along and stopped to help when my ’51 Buick (another hobby) was dead on the side of the road, so I want badly to help him out. He pushed me home with his old car. This 3.6 has been used so much, the molded mounting bolt holes for the gas tank have busted out and somebody put a big adjustable metal clamp band around the whole tank and part of the engine to hold it on. I will also check gear oil before I try to start it. Fortunately the thing has spark.
The one feature I like about the motor is the easily accessible knob for adjusting steering tension.
Your reference to the 4 HP reminded me that a friend gave me three old motors in trade for one nice one a few years ago and one of them is a 4 HP Mercury that I haven’t touched yet. I’ll have to see just what it is and if it’s the “gnat” you described.
Thanks again for the info!
Dave