SOURCE: Coleman generator OHV3000
The carburetor is probably clogged up. Mix a bottle of carburetor cleaner with the gas to see if that would help. Also check/replace the fuel filter.
SOURCE: lost manual 6250 watt coleman generator what oil to use and were
If it has the Tecumseh engine..
Above 40°F Straight SAE 30W
Below 40°F down to -20°F Straight SAE 10W or SAE 5W30 or
Below 40°F down to -40° SAE 0W30 Synthetic
Using multigrade oils above 32°F will increase your oil consumption. SAE 10W40 is not recommended.
Per the manual, all the oils should be marked A.P.I. Service SL/SJ, but you may have to use something to a newer standard. E.G.: Service SM.
The oil sump capacity is 1-5/8 U.S. Pints or 0.76 Liters.
Hope this helps.
SOURCE: Need to know about this
To find a manual for this generator go to powermate.com and search your model and serial number. Good luck!
SOURCE: three year old coleman 5000/6250 generator. High
Your RPM's are too high. There is no voltage regulator in coleman generators (generator is actually made by generac) and is 100% dependent on engine speed. There is a screw under the tank when your looking in from the recoil side. It controls the governor arm. Screw it in and it incresses the rpm, out decrease. Plug something in that draws a decent load while setting the rpms since you want it to put out 120 and 240 underload. Your idle voltage does not matter.
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