71 9.5hp wont stay running

H

Haus

Seaman Apprentice
Joined
Apr 27, 2012
Messages
32
picked up a used 71 9.5hp, dont know how long it sat for.

since getting it, i have replaced, points set, both coils, j6c plugs, impeller, lower unit oil, starter rope....

it has good blue spark from the tester, and has 55psi compression in both cylenders.

it will start up for a second with pre-mix sprayed into the plug holes, and found it will rev up then promptly die when i spray pre-mix down the carb opening.

any ideas on what it might be? im thinking fuel problem, is it time to overhaul the carb?
any sugestions or idea on what it might be?

Thanks
 
R

Rick.

Captain
Joined
Jul 30, 2006
Messages
3,740
Re: 71 9.5hp wont stay running

Sounds like you're on the right track with a carb. kit. Make sure you get every passage clean. I think you are right, it isn't getting fuel. Have you set the slow speed needle correctly? Best of luck. Rick.
 
H

Haus

Seaman Apprentice
Joined
Apr 27, 2012
Messages
32
Re: 71 9.5hp wont stay running

i have not touched anything on the carb yet. it has a slow speed adjustment knob on the front of the engine cover, its the cable type. whats the corrrect position of this knob for easier starting?
 
AEROCOOK

AEROCOOK

Master Chief Petty Officer
Joined
Jul 28, 2004
Messages
872
Re: 71 9.5hp wont stay running

These carbs are easy to remove and easy to clean, the high speed jet is hidden underneath the float bowl drain screw, you will need a very thin screw driver to get it out. I took the carb off of my 1966 last night, complete dis-assembly, clean and re-install in under an hour. According to Leeroy's Ramblings, the initial setting for the slow speed needle is 3/4 turn out from lightly seated but depending on how the motor runs, you may have to go out as far as 1.5 turns.
 
R

Rick.

Captain
Joined
Jul 30, 2006
Messages
3,740
Re: 71 9.5hp wont stay running

A new carb. kit might be a good idea but I would set the slow speed first and see if that does any good. If the P) did a kit you should be able to tear it down and just clean it. Rick.
 
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