6 HP Rude Fisherman Running Rough

[superflydudebike]

Just purchased a 1972 Fisherman. The guy told me that it had a new impeller and a carb kit this year. I took it out on lake and it revs up in neutal, but when put in forward, it barely accelerates and there is a definite chugging. Either it is missing or it simply is not getting enough fuel. Any ideas on how to isolate problem and fix it? I ran it for about a half hour and it never conked out, but it is not throttling up like it should. Also, I shut it down and I needed to choke it to restart it after it was already warm.

 

[freddyray21]

Re: 6 HP Rude Fisherman Running Rough

could be bad carb rebuild, but more likely one of the coils is bad. With it running pull one plug wire and see if it makes any difference. If it's running on one you can pull one and it will still run. Put it back on and pull the other one and it will die.

 

[tashasdaddy]

Re: 6 HP Rude Fisherman Running Rough

99 % carb is varnished up, do to sitting. or carb adjustments.

http://forums.iboats.com/showthread.php?t=167352

 

[kenmyfam]

Re: 6 HP Rude Fisherman Running Rough

Rebuild carbs and then do a decarb with seafoam.
Just my 2 cents.

 

[superflydudebike]

Re: 6 HP Rude Fisherman Running Rough

The guy put a new carb kit in earlier this year. I called him and he said it ran good after that. I opened the gas thak and saw some rust on the cap. I asked him about it when I called and he said that the tank was full of rust and he cleaned it out by shaking a chain unside of it. Plus, the gas is about six months old. If the carb is varnished up, why would it throttle up well in neutral, but then sputter when in forward. I have two of these motors (same year/model). Are the coils easy to swap out? It would seem like a good way to check this angle.

 

[superflydudebike]

Re: 6 HP Rude Fisherman Running Rough

Is there anybody out there? Is there anybody home? Throw me a line or at least some advice.

 

[superflydudebike]

Re: 6 HP Rude Fisherman Running Rough

One more bit of info. Would a too rich setting cause this problem? It was cranked up to 7 on a 1 to 7 knob. My other identical motor seems to run fine at 3 to 3.5.

 

[Rick.]

Re: 6 HP Rude Fisherman Running Rough

The actual number on the knob doesn't mean too much unless you know how many revolutions the needle was turned out before the knob was put on. Rick.

 

[iwombat]

Re: 6 HP Rude Fisherman Running Rough

Just pull off the knob and put it back on so it reads 3. It'll be just like your other motor that way

 

[superflydudebike]

Re: 6 HP Rude Fisherman Running Rough

Wow. Killer material. You could write for Shecky Greene.

 

[freddyray21]

Re: 6 HP Rude Fisherman Running Rough

if the high speed needle it out too far it will not run out when under a load. As you are running it under a load turn it in until it picks up. At some point turning it in farther will make it run slower so back it out just a bit from that.

 

[Tim Frank]

Re: 6 HP Rude Fisherman Running Rough

T I called him and he said it ran good after that. I opened the gas thak and saw some rust on the cap. I asked him about it when I called and he said that the tank was full of rust and he cleaned it out by shaking a chain unside of it. Plus, the gas is about six months old.

If you haven't checked the fuel filter, that would be a good first step. You can clean those screens, but if it is really badly choked it is sometimes better just to get a new one....they are not expensive.

Also, depress the ball in the motor-end gas line connection and pump a few squirts of gas into a glass jar and see if there is any sediment/water/general debris. That will tell you how good a cleaning job the previous owner did on the tank.

 

[kenmyfam]

Re: 6 HP Rude Fisherman Running Rough

Dump the old gas, run from a known good tank, clean the carbs and filters and try again.

 

[ondarvr]

Re: 6 HP Rude Fisherman Running Rough

You can easily be fooled when running it in neutral, with no load it will rev easily even on one cylinder.

Have you tried what's been suggested so far?

If there's any rust inside the tank, chuck it and get a new one.

Check for spark to each plug, check it when running also.

Clean the carbs.

Check to see if the throttle and timing linkage is moving correctly and together.

 

[samo_ott]

Re: 6 HP Rude Fisherman Running Rough

I say coils. Check the spark asap as that's an easy first step. If not then it's fuel related. BTW, did you check the compressions? What are the numbers?

 

[superflydudebike]

Re: 6 HP Rude Fisherman Running Rough

Thanks for the all the helpful comments and even the mild attempt at humor. No one knows who Shecky Greene is out there? I have not tried anything yet. I think it is fuel related. It feels like it wants to take off, but I get an intermittent spit back when throttle is opened up. Also, playing with the rich/lean knob seems to have no effect. I should have not have bought this turkey w/o seeing it run first. I vow never to do that again. I'll keep you folks posted as I delve into it further. Gas is from beginning of season. I paid $250 for it. I'll hook up a different gas tank to see if it performs better and go from there. Filter screen is likely fouled up as well. Thanks.

 

[ondarvr]

Re: 6 HP Rude Fisherman Running Rough

Running it as is can create very costly problems, buy the carb kit, it's cheap, easy and won't take much time. If turning the knobs had no effect, then it's dirty and needs cleaning anyhow.

Having a dirty carb doesn't mean it's a turkey, they're very good motors and carb cleaning is part owning an outboard. Running old fuel from a rusty tank didn't help.

 

[steelespike]

Re: 6 HP Rude Fisherman Running Rough

If it is chugging kind of like dug dug dug it may be 4 stroking usually caused by too rich high speed setting.If its not adjustable then the float perhaps.
You might check that the stator is advancing as it should.If he had the carb off perhaps he messed up the linkage or something fell off.If you can't turn the mixture knob far enough to solve the problem remove it and turn the needle valve till it sounds right. Put the knob back in the middle position.

 

[superflydudebike]

Re: 6 HP Rude Fisherman Running Rough

Yes, this sounds exactly like what is happening. I take it there are two needle valves, correct. One for slow speed and one for high speed, right? The guy that sold me the motor told me that his cousin replaced the impeller (water is pumping fine) and did the carb kit, so I have no idea if the guy was competent or not. Like I said earlier, lean/rich knob adjustments seem to have no effect on performance of engine.

 

[asdasc]

Re: 6 HP Rude Fisherman Running Rough

Just out of curiosity, what size boat do you have it on?

Could it be that you simply have the wrong prop and that you are overloading it?