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Old 03-22-2010, 08:15 AM   #1
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Generac pulses

Good morning. I've done minimal searches for this with little luck. This is on a '75 Argosy 26' MOHO that's been sitting a few years. It starts after tuning over several times and starts pulsing or lobing and barely holds an idle. I can see a link arm moving, I assume a governor, that seems to be controling it. It starts easier and runs much smoother if I hold the choke closed manually. One "local expert" says the carb needs to be cleaned out if it takes extra choke to run smoothly.

I haven't spent much time on this, any advice would be appreciated.
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Old 03-22-2010, 08:29 AM   #2
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Greetings from the Florida Panhandle

It sounds you are dealing with a couple of issues that maybe causing the engine running the way you are describing. All are related to the fact that this engine has set dormant for a long period.

The carburetor most likely does need a good cleaning. First, try it chemically. If it's really bad, you may need to remove and disassemble the carburetor for a complete cleaning.

Check the points and make sure that they are clean. Also replace the condenser as it's hard to tell whether it's good or not..

Stale gasoline could also be a problem. It is best to drain the tank, clean it out and use fresh gasoline.

Brian
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Old 03-22-2010, 09:26 AM   #3
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I Concur with Brian.The surging is or can be caused by two things
1 OLD FUEL
2 Dirty Carb
It would be best if you were to drain the fuel tank and refill with fresh fuel.If the MOHO is to continue to set fro any period of time I would suggest adding 2 oz. per gal of Sta-Bil Fuel Stabilizer.
The carb is actually not dirty,but is gummed up inside.There are a number of small gallies or channels drilled thru the carb body.They are also orifices or jets in the carb that become clogged,when the gasoline part of our fuel(I call it Designer fuel) today evaporates and leaves a brown,gummy residue that cloggs the ports,jets and atmospheric channels.The result is what you are experiencing.
I deal with this all the time in small engines,its the same only on a large scale.
So get that carb cleaned and readjusted and some fresh fuel and you should be fine. Check all vacuum hoses also.
Good Luck
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Old 03-22-2010, 10:11 AM   #4
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Thanks guys. She came with less than a quater tank, and luckily sat long enough that there was no ethanol involved. I put 5 gallons of fresh gas allong with a bottle of techron and some octane boost, and have been running it through the main engine to try and clean things out. The generator isn't doing as well. As a priority it's down on the list but I would like to run it while working on other things just to get everthing up to par. thanks again.
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Old 07-21-2010, 05:43 PM   #5
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bad fuel!

Bad (old) fuel causes the majority of poorly running generators, it gums up the carb and fuel lines, plugs filters etc. Also check the fuel lines swollen rubber causes a closing of the interior of the line and restricts the amount of fuel the generator gets.

The condenser either works or not no in between, points wont make it surge. Dirty carb or possible broken governor spring.
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Old 01-28-2011, 11:15 PM   #6
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I'm having the exact same problem on my 75, any updates?

I actually stuck a small rock in there to keep the speed steady, worked but obviously not a great solution. I have the manual for disassembly of the generator so I may tackle that soon, it also needs a new exhaust so the question is, is it cheaper to just upgrade?
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Old 01-29-2011, 07:36 AM   #7
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Pour-in cleaner and new fuel mixed with old will not solve the problem of a dirty carb. The carb will have to be removed and then stripped and probably soaked in something like BM-12 Chem tool or other liquid carb cleaner over night. Get a carb kit, and put it back together. It will run like a champ.

Not a tough process.

Good Luck
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Old 01-29-2011, 08:18 AM   #8
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Quote:
Originally Posted by projector View Post
Good morning. I've done minimal searches for this with little luck. This is on a '75 Argosy 26' MOHO that's been sitting a few years. It starts after tuning over several times and starts pulsing or lobing and barely holds an idle. I can see a link arm moving, I assume a governor, that seems to be controling it. It starts easier and runs much smoother if I hold the choke closed manually. One "local expert" says the carb needs to be cleaned out if it takes extra choke to run smoothly.

I haven't spent much time on this, any advice would be appreciated.
Hi projector;
Your "local expert" is 100% correct. Surge is a definite indication of low fuel supply to maintain power. Clean out the carb including passageways and fuel jets. Do not forget any fuel filter or tank drain screen. Be sure your fuel is fresh. Thanks, "Boatdoc"
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Old 01-29-2011, 10:05 AM   #9
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Immediate problem sounds like bad gas but it probably would not hurt to put in new points and plugs.

You may already know but..

Once you do get it up and running OK then always run with a load on the generator to prevent carbon build up.

When the main tank gets to 1/4 or less the generator will run out of fuel. The generator fuel pick-up is designed that way.
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