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Carb and voltage adjustments for Echo EG-750 portable generator .4cycle gas engine

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SOURCE: Powermate 6250 loaps.

I took a new generator out of the box, filled it with oil and gas then started it. The govenor /carb linkage was moving violenting back and forth and the engine was backfiring.

I was able to get it to settle down by holding the linkage and closing the throttle plate a little but it would resume surging and backfiring when I let go of the linkage.

I tried again several weeks later. This time, after babying the linkage to get it to settle down, I moved the linkage about a 1/4 inch (which closed the throttle plate slightly) and lightly secured it in place with a ty-wrap. After running 10 minutes it finally settled down to where the backfiring stopped and the linkage stopped moving.

It was still okay after powering a heater motor and light.

I'm thinking that the problem with this engine is just that it needs a long warm-up time. I know very little about engines, so I could be wrong.

Bill

Posted on Dec 14, 2008

  • 63 Answers

SOURCE: generator hard to start and backfiring

Sound like you've done things in the correct order, tecumseh's are notorious for carb problems if you let as sit in them. Backfiring is timing related (flywheel key) or valve problems. I would take a closer look at the exhaust valve I don't believe it is closing all the way.

Posted on Mar 16, 2009

mydogisk
  • 49 Answers

SOURCE: Guardian generac 10kw model 5502 does not output correct voltage

the instructions says the voltage regulator is automatic/digital. when you check the voltage is there any load on the generator? if applying load to the generator doesn't help, you can manually change the motor speed where the governor connects to the carborator, but it may change the frequency, but the regulator may fix it

Posted on Apr 13, 2009

  • 4088 Answers

SOURCE: troy bilt gas portable generator not producing

First thing to check is to see if the generator is actually turning--couplers sometimes fail. You need some electrical skills and a voltmeter to trace down problems in the generator beyond checking the health of the two brushes that supply current (< 115 volts DC) into the rotor field circuit. You can find wiring and schematic drawings on the Troy-Built web site, just look for the 030248 model. Another person that I worked with had a similar unit with the same problem. It looked like the voltage regulator board was the problem, but haven't heard back if he had fixed it.

Posted on Sep 26, 2009

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Briggs & Stratton Briggs Stratton 6200 Watt Portable Generator voltage adjust


Usually the cause of slightly low voltage like this is that the engine is not running at full operating RPM. Find the high speed adjusting screw on the govenor linkage and adjust the engine RPM until the output is 220V - 240V

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Generator surges even under load


Make sure all the springs that go to the carb and govenor are in place. some of them are just used to keep the linkage tight so there isn't any play. Another possibility is that the mixture on the carb is not set right. If you have an adjustment for the mixture, you can try to adjust it. With the engine running and warmed up. Turn the main jet adjustment screw (usually located at the bottom of the bowl) in till the engine RPM's start to drop. Then back it out til the engine runs smooth again. I would back it out another 1/4 turn and try it there. They tend to run better if they are set a little on the rich side.

Another possibility is bad gas.

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The problem is related to the engine. When a load is put on the generator, the engine's throttle will want to open to maintain RPMs. If your carburetor is misadjusted or gummed/varnished, when the throttle opens, you will get a fuel starvation and the engine will die. If the generator is used regularly and hasn't sat for a while, first check to make sure the spark plug is good since you don't want to make a carb. adjustment using a worn plug. After you adjust the carb. manuallly flick the throttle to ensure that the engine doesn't 'stutter' or die out. If it does, increase the gas in the air/gas mixture and if that doesn't solve it, remove, disassemble and clean the carburetor.

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With starting fluid, it runs, so this means spark and compression and valves closing properly. You mention gas flow, so gasolene is getting to the carb. This would then leave the problem being in the carb if indeed fuel is present at the carb. If you take apart the carb right now, is there fuel in the bowel? Or, remove the bottom screw on the carb, does gas flow out? Does it flow continuously or does it quit? This will indicate if the float valve is indeed opening. The only thing if you have fuel in the bowel and no start, even with the choke closed, is that the main jet must be plugged. Had the unit been sitting for quite a while with gasolene in it? Gas can "varnish" after a few months and this can cause plugging of the jets and other passages. How old is the gas in the unit? Old gas won't burn in the engine and this can also be a problem. Drain the tank, and carb, put some new gas in the unit and try it. You might have to take the carb apart again and use some carb cleaner to blow the **** out of all the carb passages. This should get it going again. Now, most important, when you get it running again, you need to adjust the engine speed so that you do not burn out any electrical equipment. If you have access to a frequency meter, plug it into the 120 volt outlet on the generator and adjust the speed so that the frequency with no load is 62 - 63 hz. This will allow the generator to drop to 60 hz under load. The adjustment is a 5/16 nut, right side of the upper engine, facing you.

Jan 31, 2011 | Briggs & Stratton Power Products 5,550...

1 Answer

I have 5700 Mcculloch generator and when I open the fuel line it starts leaking from a hard black rubber next to the carburator


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Nov 09, 2009 | Briggs & Stratton Power Products 5,550...

1 Answer

Generator doesn't start


Hi

Check the spark at the plug,compression and carburation.Priming the engine,putb some gas in the cilinder and start the engine.If the engine runs only the gas you puted in the cilinder you have a delivery problem to find and fix.Remove the carb,disassembly and clean it,check and clean the air and gas filters.

best regards savumihai71

Jan 11, 2009 | Briggs & Stratton Power Products 5,550...

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