Dupree Maximus
New member
2007, 50 hrsp, 4 stroke. Was wondering if bad/old gas can also be a problem. I filled up around Labor day with 87 octane which probably contains up to 10% ethanol. I take the pontoon out the other day and it was running fine, then after 20 minutes of continuous running, the motor would increase RPM, then decrease, increase, decrease from 50RPM to 40RPM, increase, decrease back and forth until it finally leveled out @ 40RPM and never picked up speed at full throttle, BUT never cut off on its own either.