Runs rough when choke pushed all the way to run position
The generator starts easy when in full choke. When the choke is pushed half way back, it runs well. However, when choke is pushed further towards run position, it begins to choke out. At first, it cut off, and now it runs rough in that position. Generator only has 2-3 hours of run time.
Also, I bought this generator from Home Depot--it had previously been returned and had no manual. Where could I get a manual for this Coleman Powermate 5500 which has a Yamaha MZ300 motor.
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This generator is equipped with an auto choke. What is likely occurring is as the engine warms up the choke is returning to the normal choke off run position leaning the mixture two lean to maintain operation of the motor.
This is occurring because the residual fuel that was left in the carburetor has evaporated and the gum residue is reducing the fuel flow through the carburetor. When the choke is applied the mixture is rich enough to support running and as the choke returns on its own to the run position the mixture leans out and the generator stalls..
Override the choke when the engine is starting to falter to confirm the problem. Continuing to attempt to run the engine possibly adding a carburetor cleaner additive to the gas will likely return the unit to normal operation.
If attempting to enrich the mixture by applying choke when the engine begins to falter does not work then a fuel flow problem to the carburetor may be the root cause. I would look for a plugged fuel filter or restricted fuel flow from the tank to the carburetor. What is happening is when the unit is at rest the carburetor is filling with gas and as it is running because of a restricted fuel flow the level lowers in the carburetor bowl resulting in a mixture to lean to run.
If it runs for hours under the same a mount of load then, chokes down, make sure fuel lines are fully clear, it may operate with a full tank of gas then when the weight of the fuel in the tank gets less has a problem. When it chokes out fill the gas back up and see if it works again. Also make sure the choke butterfly is not closing again whilst hot. I don't know how many hours are on it, but a decarb may be in order, especially if it runs for hours no issues
Hi Joe, I had asked for a little clarification and have not received any information. I will answer this question based on the generator is in good working order and it is a recoil start. Open the petcock, (this is the fuel valve) and give it about a minute to fill the fuel bowl on the carburetor. If your generator has an engine an on/off kill switch, set to on. If the generator has an auto idle switch set it to off. If the engine has a throttle lever located under the carburetor, push it all the way down (full throttle). Pull the choke knob out completely, there is a detent on the choke for half choke, pull it past this for full choke. pull the recoil starter rapidly. As soon as the engine starts running push the choke knob to half choke, this will allow the engine to run smooth while it's warming up. Depending on the climate that you are in, warm up time will vary. After a minute or two in cold climates start pushing the choke knob in, if it starts to run poorly pull it back out too the half position and let it warm up some more. When you can posh the choke in without the engine faltering it is ready to go. In warmer climates you might be able to start the engine without the choke or in the halfway position. Robin Subaru makes some of the finest small engines available. I would choose a Robin over a Honda every time. I hope this gets your generator going, and once again this is based on the generator being in good working order. Good luck, Michael Burke.
if you are running the engine at full CHOKE, then it is flooding the engine, but if you meant off full choke, then the carb is still stopped up. Try soaking in carb cleaner overnight after removing jet & all rubber goods. HOPE THIS HELPS.
1. Fuel selector: ON
2. Start run sw: ON
3. Oil Level : Full
4. Choke selector FULL ON for no more than 2 pulls initially The half choke then off
5. Spark at the Spark Plug YES? NO?
a. No spark suspect low oil level sensor is grounding the ignition either due to low oil level or it just is not working properly.
After doing all of the above...
Spark Plug WET or DRY? Dry and still won't start check fuel supply. If you use the choke with the start run switch in the off position the spark plug should get WET. Spark plug does not get wet... with choke on and ignition off. Fuel supply problem.
At this point I suspect either the Oil Level is incorrect or... that the FUEL SELECTOR is OFF.
If you need more help just respond here and we can press on.
This sounds like a problem with fuel settings or dirt in the jet.
If you can find the carb adjustment screws, with it runing on full choke - screw it in fully untill it stalls, then back out to original position, then restart.
Take off choke and adjust setting untill it runs well when warm with choke fully out.
You can then try and make it run leaner without stalling.
Fresh fuel? Does carburetor have adjustable jets? Turn the high speed jet (at bottom of float bowl) about 1/4 to1/2 CCW (looking at bottom of bowl). If no improvement, carburetor should be torn apart and cleaned. This also applies if there are no adjustable jets. Is there a fuel filter anywhere?