Question about Coleman Powermate Premium Plus 6250W Portable Generator
Filled new generator with oil and fresh gas then started engine. The engine loaps with the carb linkage moving back and forth on it's own.
I also do not see where engine speed is adjusted eventhough the Tecumseh manual says it should be. Any suggestions?
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.
Posted on Dec 14, 2008
I've never been a big fan of the 180 OH family of engines in these things, but here goes.
1 - If the engine will stay running while it surges, close the choke a little at a time and see if it settles down. If it does, there is something amiss in the carb. The carbs on these engines are very picky about tiny bits of dirt. The good news is that they are fairly simple to take apart and clean, the bad news is that lots of the parts are plastic and break easily. At least they aren't too expensive.
2 - I've seen 2 ways to adjust the governed speed on these engines; a spring that connects to the governor arm at one end and a tab bent up from the sheet metal that mounts on top of the engine at the other - bend the tab so the spring is tighter to speed the engine up, and (b) a jam nut and screw mechanism that presses against a lever that pulls on a spring that connects to the governor arm - screw the screw in tighter to raise the engine speed.
Note that in either case the mechanism adjusts the tension in a spring that pulls against the governor arm, this is helpful in finding out where to make the adjustment.
Here in the US we want our 2 pole generators like this to run at 3750 rpm at no load so that we get very close to 3600 rpm at load. If you're using a DMM to measure the output of the generator in Hz, you want 61.5 at no load.
If nothing you can do with the choke makes the surge go away, you might have a misadjusted governor. The Tecumseh service manual has a great procedure for making this adjustment, essentially what you do is loosen the retaining nut on the governor arm, twist the governor shaft to its minimum speed position, then hold the throttle assembly at the idle stop and tighten the governor arm jam nut. Always keep a finger near the kill switch when running the engine the first time after this procedure, it's easy to mess up and have a runaway engine.
Please rank me if this was helpful,
Posted on Dec 02, 2008
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