I've been having some issues with my prairie 700 for about 6 months my a tv has been bogging down after about on minute at full throttle, some times even completely stalling and not starting back up for about 30 seconds. But when just putting around doing yard work it ran great. Then I parked it for about two weeks and started it so I could haul off some stumps when I stopped to unchain the stump I smelled burning oil and gas so I looked at the engine and there was a oil/gas mix pouring down from out the rear head exhaust where my hmm pipe slips on and isn't completely sealed. I turned it off ad checked the oil and the same mix seeped out the dipstick hole I drove it home very slow only about 30 feet shut off and coasted down hill to my garage. I tore down the carb all the jets are clean and no stuck float I've drained the oil and am replacing the plugs they were full of carbon but I saw no oil on them and my inline fuel filter was full of some red powder stuff so I'm replacing it too but have no idea why the crankcase filled with gas any ideas
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I also have ordered a compression tester but doubt it's the rings I poured some seafoam into each head a waited to see if I came out the oil drain and it din not

 

did you check the choke cable, #1 problem with these units.

 

Well...there's only 1 way for fuel to enter the crankcase and that's leak-down past the rings...but that would suggest excess fuel is entering the cylinder...

 

Save yourself some headaches and rebuild the carbs,don't just clean them. Worn float needles are the main cause of fuel getting in to the crank case even if the float level is set correctly. Gas can bypass the worn needle and seat and either drip from the over flow tubes or go straight into the cylinder or both.

 

I got my compression tester and have 75 PSI on front and rear cylinders is that right? Seem ok to me I did the test with the pull start.

 

Way too low, but did you test with throttle open, and why not test on the starter motor, or even one cylinder running?

 

I had no oil in the engine and the battery & carburetor removed I have since added oil with a small amount of seafoam and replaced the in line fuel filter. The red stuff in the filter was from having 30%+ ethanol at some point in the fuel mixed with water idk how that happened but I believe the bogging down at full throttle was from the clogged filter restricting flow. I also have new plugs so later tonight I'll vacuum the spark plug holes and put new plugs in. But I want to replace my pump strainer and carburetor needles but can't get 3 of the screws out some I'ma use my dremal to cut a slit in the screw heads and remove them with a flat head and replace the Philip screws with hex head screws I'll report progress tomorrow

 

I also was aware that the compression was a little low but because I did not have more than a 10% difference between the front and rear cylinder I'm considering it to be okay because of the fact that I did not use the starter motor or with the throttle open and did not have any oil in the engine other than the oil that was left coating it from draining

 

Get a small pair of "baby" channel lock pliers to remove those soft headed carb screws. Most good hard ware stores will have them.A useful tool that I used often. Then you can change to allen head screws if you wish afterwards.