I believe the venturi is bigger on the hd12. I bought a used 372 with an hd6 and I replaced it with a brand new hd12 and it ran better/stronger. But also I’m comparing old, used to brand new.
But I would guess the bigger Venturi would help make more power.
I just bought the super jolly last month. Still getting used to it. But it’s a nice grinder. I bought it from maverick mower, recommended on here. The 2 grinding wheels were broken on arrival so I called them up and a week later I got 5 of each in the mail. Now that’s some good customer...
Not 100% sure but I think a member here was talking about putting a 357 top end on a 359 case. Which would essentially be the same thing. They said it made a broader power band.
Yep craftsman lawn movers been running on old gas for years. Old boat gas (mix), old generator gas, chainsaw mix that’s been around to long. I almost think the extra lube has kept it going this long. Same 12hp Briggs has been bolted into its third lawn tractor.
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