Johnson 6hp won't throttle up all the way

[Perspective]

http://ww2.iboats.com/Carburetor/dm/...iew_id.1546130

And…the roller has to contact the cam at the indentation/mark — carb throttle plate should begin to open at that point in the timing advance (the “link and sync”)

oldboat1, you're awesome, you clued me in to my problem. I'll get to that in a second.

So I fixed the high speed issue. When I replaced the small hose in the carb I cracked the bowl and replaced it. While doing this I missed the small gasket under the high speed nozzle. Well the high speed issue is resolved but now I have stall when idling down.

After reviewing your post I realized that I had a nice gap between the roller and the cam around the notch and made the necessary adjustment. Much improvement but still stalling when idled down. I guess I lost adjustment when I disassembled it or someone in its past life adjusted it as the carb got out of adjustment.

Is it ok to keep adjusting the roller cam until I get no stall or is there a better way to prevent the stall?

Thanks!

 

[oldboat1]

Not the roller cam if you have it on the cam mark. I'll guess the low speed needle on top. 1 1/2 open from lightly closed as an initial setting, but adjust from there -- stalling usually indicates a little lean (correct by turning just a bit counterclockwise).

(wow. awesome. feeling the pressure now..... )

 

[Perspective]

Thanks I'll try that next time I work on it. I got tired of working in the 100% North Carolina humidity. I'll update in a few days once I get it.

 

[Perspective]

Not the roller cam if you have it on the cam mark. I'll guess the low speed needle on top. 1 1/2 open from lightly closed as an initial setting, but adjust from there -- stalling usually indicates a little lean (correct by turning just a bit counterclockwise).

(wow. awesome. feeling the pressure now..... )

BTW, I just looked at my last thread from a few months ago and you solved that one too. I really appreciate your help.

 

[oldboat1]

You're welcome. Hope the heat and humidity breaks!

 

[Perspective]

Not the roller cam if you have it on the cam mark. I'll guess the low speed needle on top. 1 1/2 open from lightly closed as an initial setting, but adjust from there -- stalling usually indicates a little lean (correct by turning just a bit counterclockwise).

(wow. awesome. feeling the pressure now..... )

I think I have it close. I did have to tighten the roller a slight bit to prevent stall. It no longer sits on the idle screw and the low speed is a lot further in than before I cleaned the carb. I am starting to wonder if the plastic top of the carb got scratched by the low speed screw. Also, once I put the air delete back on it stalls at idle. I think I'll remove the top of the carb a clean the low speed out again. Other than that it's good. Definitely usable now.

 

[capt obvious]

Try a new fuel hose, or borrow one from a bud. sounds silly but my father-in-law gave his '64 6hp and it ran great until one trip it just bogged down. pretty much rebuilt this motor but nothing helped. then one day i noticed tape unrolling off the hose at a connection. he's not that handy and tape is his go to and he did a real good job because i couldn't tell it was on there. anyway, i bought a new hose and low and behold, it runs like new. i recently got a boat off my brother with a 115 hp, and same thing ran rough. then i noticed when priming, gas spewing out of the connector on the motor. changed it and again, runs great now.worth a try.

 

[Perspective]

Capt obvious, thanks for the suggestion. Unfortunately, all the hoses are brand new connected with c clamps. Absolutely no leaks.