How often do you have to change the oil on the Coleman 6250

SOURCE: oil type and capacity

Use 10/30 weight oil fill till : " if it has a "dipstick" fill to middle of hash marks" if not, There in the hole for the oil filler cap their is a knotch cut out of the theads for that cap. fill to just below the top of that knotch . drain plug on bottom of crankcase

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: 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.

SOURCE: Coleman 6250 Generator won't turn over

try removing the air filter and try starting if it dirty or to oily , no vacuum is created to pull the fuel into the carb

Testimonial: "I removed the air filter,then put air filter back on,it started for 2 mintes.I shut it off, but then allot of gas just spewed out of the air filter?"

SOURCE: where can I get a manual for a Coleman 6250 Generator

go to the coleman web site here is the site for the free manual. http://lawnandgarden.manualsonline.com/manuals/mfg/coleman/coleman_portable_generator_product_list.html