johnson 9.5 doesnt run right

[scotty1969]

well, my son and i got a small fishing rig a couple weeks ago . its a 14' flat bottom which we had to replace the wood in the transom (thanks to some of the articles here) which went very well . then we moved on to the motor
(a 1965 johnson 9.5 MQ11) , i found,with some help from some of the folks here, that it needed a fuel pump which was pretty much a straight forward operation . we got it running pretty well in the driveway (little hard to start though) i had to set the idle a bit higher than i thought it should be . it ran in the barrell .

then today we took it to the river , got it started and off we went . when we ran up stream about a quarter mile and it died . before it died it was "loping" sp?and was a real bear to get re-started. once we did i just kept at a slow pace and it ran great we went about 2-3 miles upstream( figuired if worst came to worst we could just drift back to the truck ) we ran that motor for three hours or so at a mid throttle or less speed and it did great . but if i tried to run it either at the high end of the throttle it would die also if i turned it down to idle it also would die . i hope this is just an adjustment issue . but i am lost when it comes to small motors . i can replace parts pretty well , but i dont know where to begin . this motor has an exterior adjustment for the low speed mix which seems to like the lean side a bit .

does it need a new carb ? need adjusted ? as mentioned before i am a newbie with small motors .

 

[Rick.]

Re: johnson 9.5 doesnt run right

It is difficult to get it diagnosed from a distance. Here are some things it might be. Un-vented gas tank.
Bad coil/s
fouled plugs
dirty high speed circuit in carb.
exhaust leak in cowling
improper setting on carb.
That's just o name a few. I'm thinking you need an OMC service Manual to assist you. Next time it happens you need to check for spark right away just to see if one or both cylinders is getting good spark. A carb. kit/cleaning is never a bad idea for an engine you purchased used. The high speed jet orifice can get plugged. Have you pulled the flywheel and had a good look at points and coil condition? Rick.

 

[scotty1969]

Re: johnson 9.5 doesnt run right

well , i have narrowed it down to the carb. now the question is where do i find the re-build kit for it ? it is a 1965 9.5 model MQ 11. all the sites i have found parts only go back to '68 . any ideas ?

Scott

 

[Rick.]

Re: johnson 9.5 doesnt run right

I would try to find an OMC dealer in your area and buy direct from them. You should have no problem getting the parts. Rick.

 

[scotty1969]

Re: johnson 9.5 doesnt run right

i found an internet dealer that has what they say is the correct kit for my carb , but it says its for all 9.5's from 64-73 , does this sound right ? is it the same carb from 64 to 73?


has anyone had experience with "maxrules.com" i just have a hard time trusting sites with no prior dealings and would like to hear if anyone has delt with these folks before

Thanks , Scott

 

[scotty1969]

Re: johnson 9.5 doesnt run right

i found an internet dealer that has what they say is the correct kit for my carb , but it says its for all 9.5's from 64-73 , does this sound right ? is it the same carb from 64 to 73?


has anyone had experience with "maxrules.com" i just have a hard time trusting sites with no prior dealings and would like to hear if anyone has delt with these folks before

Thanks , Scott

Bump

 

[Daviet]

Re: johnson 9.5 doesnt run right

Most after market kits service multiple carbs, there are usually parts left over that you don't need.

 

[scotty1969]

Re: johnson 9.5 doesnt run right

got the carb kit and there are two little plugs on the side of the carb body . what are these for ? should they be removed ? i have the replacements ,but, dont know whats behind them and if they should be removed

 

[scotty1969]

Re: johnson 9.5 doesnt run right

well , it is amazing what you will learn if you read the directions......lmao.

just was reading the manual and found that my motor doesnot have a high speed adjustment... i am glad cause all i could find was the jet with no way to adjust .... still didnt find anything about those plugs. the drawing in the manual just calls them expansion plugs with no futher explaination . so any input will be appreciated

 

[ezeke]

Re: johnson 9.5 doesnt run right

There are no aftermarket carburetor kits for the 9.5 motors.

The OE kits are suitable for both early and late model carburetors though they are different; the kits have parts for both types.

Maxrules.com is a highly respected BRP authorized dealer among others.

The carburetor repair kit is part # 0382048.

The larger core plug on the side provides access to the three idle openings in the carburetor throat. On more recent models it is blocked by a nylon plug, but on the 1965 carburetor it makes cleaning the idle circuit much easier.

 

[scotty1969]

Re: johnson 9.5 doesnt run right

yea , already got it . found a really cool local dealer in the process . sold me the kit for about half what maxrules wanted for it . and he stocks alot of other parts for this era motor .

still cannot find any info on the expansion plugs .....

 

[ezeke]

Re: johnson 9.5 doesnt run right

Are you speaking of the lead shot that is used to seal the small openings in the carburetor body casting? If so, there is no reason to do anything with them.

 

[scotty1969]

Re: johnson 9.5 doesnt run right

update ; today got the carb reinstalled and got the low speed mix set new plugs installed fired right up when i tried to run at a higher rpm it would stutter and then eventually rev . it didnt quite die but acted like it was going to . it does idle at way lower rpms now as opposed to before i started

what next ? points and condenser? what else is there ? ( btw did a compression check and both cylinders are good )

 

[bradmond]

Re: johnson 9.5 doesnt run right

If the motor was new to me, I would replace points/condensers, plugs, water pump, and gear oil. = peace of mind.