try posting this question on the MH/MF discussion board here. That's where the MF experts reside. I have a MF 135 and 165, and you could first check the breather tube that comes out of the top of engine. If the tube is crimped or clogged it will create too much backpressure. Its happened to me. Disconnect breather tube and clean out and make sure the tube exit point is clear. Also, after cleaning try blowing into tube to check obstruction in cover screen where tube originates - but you must remove oil filler cap first when doing this. Like I said, post this question on the MF board and there are many good folks there to help you with your MF 150. Good Luck.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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