Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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It could be that you are recirculating the exhaust through the intake which would stop the air filter up rather quickly and cause the problem. Being on a roller I could see dust issues as well unless you water a lot before rolling, the dust would also stop up the air filter rather quickly and do the same thing. Did the machine come standard with this engine mounted in it? Can you possibly use a remote mounted air filter that could be mounted in a different area and hoses run down to the engine.