Monday, February 3, 2020
I am still toying with the idea of buying an old, beater tractor.
Mr. Pepper, my expert, is a big fan of gas motors. Since the vintage I am looking at is the 1960s we are talking about fifty-to-sixty year old tractors.
My brother, who is complicit in egging me on these Quixotic quests, knows some people who use tractors of this vintage on working farms. He shared that they often have hot-start issues.
That got me to thinking, is there any percentage in flipping from the factory carburetor over to Mikuni carburetors?
Mikunis are inexpensive. You can buy 34mm, round-slide Mikunis for $30 all day long. They are tunable and the more recent ones are made from materials that can tolerate 10% ethanol in the fuel.
That same 34mm carburetor happily passes enough air-and-fuel to make 35 horsepower in a Polaris 500cc engine. On paper, it should be able to do the same for a 35hp ag engine.
A 65hp engine, like that seen on a Massey 85, is a bit more challenging but a plate that mounted two 34mm carbs would meet the demand and would be cheaper than one, HP 38mm or 40mm carb. Also, if you look around you can find motorcycle guys claiming they can squeeze 70hp from a single, 34mm Mikuni.
Fun things to think about.