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A little update on my 1938 Handitwin. First off…thanks Tubs, your were right about the valve bumper…went to Ace Hardware and purchased some cork stoppers, fit one to the valve top cover and filed to the correct spacing. Motor still started and stopped so I removed the rear exhaust housing to check for carbon…found none. The pistons looked fine and the rings were loose. Put it back in the test tank without the exhaust tube and it did the same thing. Soldered in a new condenser I got from a buddy…same thing. Finally ran the adjustment needle all the way in and backed off 1/4 turn and it started right up and ran great. So A note to anyone else trying to figure out where to start the needle…..1/4 TURN OUT!!!! Doesn’t like to idle well yet but I have a temporary fuel system hooked up to run it while I’m in the middle of removing the rust from the fuel tank….while it starts with one pull I have to lean and richen it at different rpm’s. Cool little motor. Will get it running better before I consider cosmetically restoring it.