So does this have an engine mounted fuel tank or do you use a remote tank? A mounted tank may have one of those dongle like filters that could be eliminated. A remote tank may do better with a small tapered body filter or something like the Kohler 2505007s . Or a teeny fuel pump. . .

Definitely fuel starvation while under load . As Tom advised you may require more fuel pressure . Either relocate fuel tank for better flow or install a small electric fuel pump , the pulse units often supply marginal flow and a dirty or restricted filter can compromise adequate fuel under heavy load conditions . You can add a clear fuel filter and eyeball it when your engine begins to stall out to verify full or empty filter at these times !

You know, this is such a cool ride- how about a keg fuel tank? Your welcome.

I don't know about what carburetor this engine has but the problem sounds like on I had on a 76' Dodge Aspin. The motor ran great, except on extreme right turns when it would cut out. I took the carburetor apart and cleaned it every thing like good. no dirt.

After fussing with it for some months, I took it to a mechanic, he took the carburetor apart and found that while the float looked good I was full of gasoline, and consequently did not float. He changed it and the problem disappeared.

A submerged float would cause excessive fuel situation , rough idle , black smoke , lack of power and fouled spark plug . The orientation of the engine cylinder and carb on many 4 cycle small engines cause these fuel starvation issues , I believe with Yt,s experience he probably already checked the float bowl to ensure the float was not hanging up , which would lean out the fuel mixture if the carb linkage was sloppy and predisposed to binding !

It is an engine mounted tank. I pulled the carb off and it was clean and the float moves freely. I am thinking it is an angle issue. I parked the tractor on the hill, pulled the fuel line and the flow was fine. Ran fine but as soon as I hit the PTO it started backfiring and starving for fuel. I guess I have to mow this part of the yard differently.

Here's the carb position on it.

Spark plug color. Drilling the main jet out helped a lot after first getting this engine.

Then the engine was lean set from the get go ! The plug coloration indicates a rather lean running engine .

Yt , as I have stated previously , your transverse engine mounting on the old Bolen,s with the cylinder and carb on the right side orientation is contributing to this fuel issue . This engine model is manufactured primarily for gen sets , water pumps , pressure washers , cultivators all which are normally a vertical engine orientation . When used in a horizontal engine designation elevation changes can effect fuel delivery . Also the pulse style pumps are marginal at best . A above remote tank and electric fuel pump design is much more efficient . As you have indicated you have had this issue from the get go and have drilled out the main jet to increase fuel delivery . Krnuttle , as advised a float filled with gas will not float and sink causing a flooded engine not fuel starved condition which Yt has indicated , further his spark plug coloration verifies a fuel deficient condition . I believe his float is hanging up partially closed during severe right elevation inclined , causing his irratic engine performance !

believe you are right ewalk. One thing I did happen to notice today at work is the golf course top dresser we have has a Honda GX270 mounted the same way on it. I'll definitely watch it when we're top dressing fairways within the next month or so.