We have a old 1947 Johnson HD-25 that we recently got restored and running again. It runs fine for about 10 seconds, then floods out. Turn off the gas for about 4 hours, then try again and same thing..runs for 5-10 seconds then floods out. I've cleaned all the caked-on residue out around the float pin and bottom of carb and the pin and float seem to be working ok. No gas comes out the top of float pin, but there is some gas that leaks around the primer valve. Set low speed valve at 1.5 turns open and high speed at 3/4 turn open.
Could the leather seals in the primer valve be letting too much gas into the carb or what do you think I should look for? There's also a what looks to be a choke valve on that carb that is supposed to be connected to a spring loaded rod...this was not connected when we pulled it out of the shed, i think it was broke on the end of the rod where a pin was supposed to attach it to this choke valve. Guess I'm not sure if that could possibly be part of the problem also. Any help would be appreciated. It's on old motor, but holds some family significance and would like to get it running right again!
Could the leather seals in the primer valve be letting too much gas into the carb or what do you think I should look for? There's also a what looks to be a choke valve on that carb that is supposed to be connected to a spring loaded rod...this was not connected when we pulled it out of the shed, i think it was broke on the end of the rod where a pin was supposed to attach it to this choke valve. Guess I'm not sure if that could possibly be part of the problem also. Any help would be appreciated. It's on old motor, but holds some family significance and would like to get it running right again!