I have a 77 Johnson 35 that is just giving me fits. I’m hoping one of you can help out here. When I got the motor it was a non runner. Traced the problem down to the needle being stuck in the seat. Rebuilt the carb and it ran OK for awhile. It has a very persistent lean sneeze followed by konking out at idle. Restart it and it runs about 5 seconds and konks out…over and over. I have spark jumping a 1/4 inch gap on the tester, 105 compression on the top and bottom. If I accelerate the motor it runs great. I have richened the mixture at idle being that it only has a idle mixture adjustment. does not seem to help. now when I try to accelerate it, it is very sluggish not running well there either. I’m scratching my head here with this thing. Bad/weak fuel pump? coil going bad? Anyone have any suggestion where to look next?
Thanks guys,
Wannabe
When you rebuilt your carburetor, did you remove the fixed high speed jet and soak it in cleaner and blow it out with air. Item number 31 in the diagram. Please refrain from sticking a drill bit or wire in the jet to clean it, because you could accidentally alter the size of the jet. It is metered size wise for a specific delivery. As for idling, in the past when the needle was stuck in the seat, it could have damaged the seat and making it much more difficult to dial in a smooth idle.
I did have the carb completely apart, soaked it in acetone. I did not stick anything into jet, wire or drill bit, nothing at all. I may try taking it apart again and see if I missed anything. The gas tank was squeaky clean with fresh fuel and oil at 50:1. I did not blow it out, that I know for sure.