3hp Sea Horse not idling,..

perry mason

Recruit
Joined
May 5, 2007
Messages
2
Johnson 3hp Sea Horse:
JW-17
B41504
Year?
Made in Belgium. It's kind of an off white. I really like it.
This was a freebee and was siezed up. Marvel Mystery oil and some pursuasion freed it up after couple of days but it shows 65lbs compression per cylinder. Is that anywhere in the ball park?
The ignition all looks new and this was suppossedly a well maintained engine until it was layed up 3 years ago.
After cleaning the carb which was rusty outside but clean inside, it started first pull but stops running after about 10 seconds. The cork float was fine and set correctly. The air intake is not plugged up. I used 2 cycle oil and followed the mix ratio printed on the engine cover.
It will only start and run with the choke out. I messed up the H/L settings removing the carb but have them set L: turn and a half out from seated. H: 3/4 turn out. You set them from the seats and then get the knobs in the middle of the range so it has about a half turn of adjustment either way?
Also, there is almost no H20 coming out of the water exhaust. It's just kind of a mist. Some of the holes look plugged and the cover screw won't come out yet. The head is pretty hot when you touch it.
Any ideas on how to get it running smooth.
Thanks and keep up the good work, p.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 3hp Sea Horse not idling,..

it's a 1961-62 it does not have a tale tell for water to come out of. it comes out the exhaust, do you have good spark? on both cylinders, those engine are known for the coils to crack, and fail. they are under the flywheel. you will need a harmonic balancer puller, and 3 #8 1/4x20 bolts to pull the fly wheel. do not use regular bolts, as the will strip leaving the threads in the flywheel, complicating matters. laingsoutboards.com has all the parts for that engine. i restoring a 1958 35 presently. here's carb settings.
http://www.iboats.com/bbboard/bbBoard.cgi?a=viewthread;fid=28;gtid=818798;gpid=818802
 

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: 3hp Sea Horse not idling,..

Won't start and run without the choke pulled out? Get yourself a carb kit here at iboats and disassemble and clean the carburetor.
 
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