Thanks for the feedback, guys!
I regard to bearing speeds, I would probably grease it every time before use (as opposed to about 3 times a year, with my 1/2 acre lot) to cut down the risk of burning them up. I've got to think that my 50 year old deck bearings are still better than the china crap in new tractors...
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I've also thought about the belt friction problem on a "super speed" pulley... The simple answer to that would be to add another idler to increase the wrap on the pulley. I have a parts 44A (rusty like you've never seen) that could donate an idler to the cause.
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I'm still on the fence on this one. I mowed again with the 4" pulley and it sure does cut nice... When I get in really heavy stuff (6" of wet grass, up hill) I still have to slow down to a crawl.
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