Pretty sure max rpm is 3,500. Did you acutually count the rear axle sprocket? (48t seems small) I was thinking the stock tires on the rear were 8 X 18" or 19", so if you go taller the speed will increase but bottom end will lag. Mine gps'd @ 34 mph (only change was 6" driven) Can't confirm the 4 X 101, I believe it's a 4 X 110 and it's the same as Yerfdog,Manco and Honda -You can always redrill the hubs for 4 X 4" or if wheels are aluminum redrill them.
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