Reply To: Evinrude Fastwin 18 HP 15032 Leaking Around Exhaust

[Jeff Barsch]

Thanks Fleetwin for your continued assistance.

I will have to figure out how to convert the video to an acceptable format so I can post. I have the carb set in the rich side of the operating window, For both high and low speed. I once it starts it will idle smoothly for about 40 seconds then start to buck mildly a few times then stall. If I lean it out the bucking gets worse and harder and it dies Immediately. I have good spark in my spark tester jumping a 3/8 gap. Attached is a picture of my top plug and the bottom looks the same. Motor runs great at High idle all the way to full throttle. I get it running, warm it up at high idle, back idle off shift and quickly increase throttle To higher rpms so it won’t die. Then it will stay running until I either kill it or try to return to a low idle.

I have not tested compression since the rebuild since I put in new rings In and my friend Had honed and miced the cylinders in his machine shop and said they were well within spec for standard rings. Also the motor runs Well at mid to high rpms so I wasn’t really worried about compression but can get one from the rent a tool If you think the numbers will be helpful.

I did have my spring fall off the choke, I have attached a picture of how I reinstalled in case I did it incorrectly.

I agree with you on thinking it is ignition and will pull the flywheel and check the timing again this week. I guess I can try new plugs also but the fact it was running so well at high idle to full speed had me ruling plugs out.

I’ll report back after ignition is reinspected.

1954 Evinrude 7.5 HP
1954 Evinrude 15 HP
1954 Gale 12 HP
1955 Johnson 10 HP
1956 Johnson 10 HP
1956 Gale 12 HP
1956 Evinrude 5.5 HP
1957 Johnson Golden Javelin 35
1958 Johnson 7.5
1960 Evinrude 18 HP
1973 Johnson 6 HP