9.5 hp coughing at low speed

[Tony031273]

Hi,<br />I have a 1965 9.5hp Johnson. At idling speed it coughs and kicks a few times then dies. What would be causing this?

 

[OBJ]

Re: 9.5 hp coughing at low speed

Sounds like it's running to lean at idle speeds Tony. Turn the low speed needle out and see if that helps...maybe 1/4 to a 1/2 turn to start.

 

[henning_dt85]

Re: 9.5 hp coughing at low speed

have the same problem, turns and turns the low-speed-knob out, doesnt help much. Tried to change the plugs, runs pretty ok at idle (coughs a little), but after an hour on those the coughing and kicking is back

 

[henning_dt85]

Re: 9.5 hp coughing at low speed

not ok after new plugs, but a bit better....

 

[wayne h]

Re: 9.5 hp coughing at low speed

maybe its time for a total tune up ? mine did the same thing untill i changed the points, condernsers, and coils, plugs and wires also cleaned the carb but did not rebuild it . i am not sure what 1 was giving me the problem but i change it all since i was underthere.

 

[wayne h]

Re: 9.5 hp coughing at low speed

o yaa and by the way if u are trying to tune it in a barrel good luck u need to take it out on the water and see what it does sometimes at low idle it will cough on exhaust gases.mine will do that but on the water she will idle on the river for hours

 

[Tony031273]

Re: 9.5 hp coughing at low speed

Well thanks for all your input. I won't be able to try adjusting the jet till next weekend when i get to the lake. I'll post back after i try it out.

 

[Tony031273]

Re: 9.5 hp coughing at low speed

oh sorry, i meant needle not jet

 

[henning_dt85]

Re: 9.5 hp coughing at low speed

to wayne: could it bee the points that fails at the low rpm?

 

[wayne h]

Re: 9.5 hp coughing at low speed

i guess it could be. it could be alot of things but even the manual says that u cant get a good tune on the engine in a tank without a test prop and the right conditions. i replace my points and condencers every 4 seasons and clean and adjusted them every 2 seasons

 

[OBJ]

Re: 9.5 hp coughing at low speed

Wayne.....henning has a good point. Quick way to check spark, put a cut off nail in the spark plug wire an set it about 7/16" from a clean engine ground. The spark should be a hot white strong spark. Try this for both leads. No spark means possibly new points or coils.<br /><br />Weak spark will cause the engine to idle bad at low speeds.

 

[henning_dt85]

Re: 9.5 hp coughing at low speed

runned it at the water on my 10ft. boat. Started it up, started at first pull ( trottle at "start"). The idle speed adjustment are sat at "slow" (lower makes it die). setting it to "slow" make it coughs and kicks a few times then dies. Starts it again (it is warm, but have to use choke). Then shifts and setts trottle wide in a couple of minutes, but at idle it coughs again and stopps. Starts it again, turns the lowspeed knob 15 times, but no result....HELPHELPHELP, no dirt in float chamber, spark is good

 

[henning_dt85]

Re: 9.5 hp coughing at low speed

cant get the lower unit off, BIG PROBLEM (3 of the 4 bolts broke off under the head), so i cant check down there

 

[OBJ]

Re: 9.5 hp coughing at low speed

Guys!! We gotta get this thread sorted out. Tony was the original poster for a problem. Now we got henning and Wayne in here. I even got mixed up. Please post your problems in a separated thread.

 

[wayne h]

Re: 9.5 hp coughing at low speed

OBJ....i dont have a problem i was trying to help with the original post i DO post my own threads everything i wrote was to help the original post not to help me my 9.5 all run like a top.maybe u are alittle confused i think we are all just trying to help him