So I removed everything I could of the old bushing from the carb. Now the motor will start and idle just fine. Adjusted idle appropriately, motor responded to changes in low speed needle. Took the motor out on the lake. Only issue is that the throttle is really jumpy. I'll very slowly give it...
I checked in there. The old bearing had come apart and was in pieces. I fished out everything I could with a dental pick. I think I got most of it out. The hole for that jet is so deep it was hard to be sure. I put the new one in and installed the needle valve. Screwed in to a gentle seat then...
I actually totally missed the ls needle bearing. Didn't take the old one out (if there was one) or install the new one. I'll tear into the carb and check that. I did remove all three welch plugs and replaced with fresh ones after soaking. I didn't remove the high speed needle from the bowl (I've...
Recently got a 1976 25hp Johnson from a friend. He used the motor for several years fishing local lakes. The lower unit blew up on him. Clutch dog came apart and took out most of the lower unit. Chowdered up the gears and put a hole in the side of the upper housing. He got a bigger motor and...
cc67: That is an absolutely beautiful motor! Someone spray painted my motor green, probably to use on a duck boat at one point. Planning on using some gas and a scotch brite pad to take the spray paint off without lifting the original paint after I get it running. I'll have to come to you for...
Update!
Rebuilt the carb and got the motor running great in my trash can back in late December. We've had a lot of snow and below freezing weather so it'll probably be spring before I can lake test. I love this motor!
Tried to run the motor today. Would only start with a lot of throttle, then die pretty quickly. Couldn't get it to run more then a couple seconds no matter what I did.
Started digging into the carb. Carb was a little dirty and actually still had the original cork float. Removed welch plug and...
racerone:
I misunderstood your message at first and only checked that the throttle plate was closed at idle. My throttle plate stayed closed way past the mark on the throttle cam. In fact, the throttle cam was soo off that the throttle didn't start to open until I put the motor in gear and...
Buster7:
I don't have an owner's manual for this motor. I did some googling and it seems most forum posts/sources I could find recommended 24:1 with modern TCW3. I decided to bump it up to 20:1 just to be on the safe side.
Crosbyman:
Great catch! The throttle cam was way off! I adjusted it so...
iggyw1:
It normally starts on one or two pulls with the throttle set to "Fast". Sounds like a chainsaw, revs like crazy, and smokes a lot. I try to rev it down as quickly as I can. Hopefully revving a cold motor like that won't score cylinders or make problems down the road.
Update #4 Boat tested the motor today. It was hard to start cold, but ran fine once I got it going. The motor seems to only want to start when I give it a lot of throttle. I'm having to choke it and twist the throttle to "FAST" to get it to start. The little motor idled down and shifted perfectly.
Thanks for all the suggestions! This is my first time working on a 50's motor. I love how almost everything on the motor is metal!
Checked the throttle plate. When the motor is at idle the throttle plate is closed. The plate only opens when the motors is in forward and the throttle is past...
Before I tried to start it up I turned the high speed needle out a full turn and the low speed needle out one and a half turns from a light seat. When the motor was running I tried to turn out the mixture screws and the sneeze/jerk didn't really go away. I probably ran the motor for 7 minutes in...
Finally got my new water pump installed. After some considerable pulling and fiddling I got the motor running and it pumps water no problem! It does run a little rough though. Probably in need of a carb kit.
I do have one question. The motor jerks every five seconds or so. Sorta like a stutter...
