I get 20mph top speed with 12" wheels and standard tires. It pulls pretty well but not as good as my F350 6.7.
I have never had or driven a vanny before and with reading this forum it just got me thinking that I must be able to get some more grunt. Top speed is not my priority but I will be towing a boat and sometimes a work trailer and it is very hilly so I am after the low end power.
Is the Governor the round bit with a short shaft and a pin through it that is a couple of inches away from the dip stick. If it is then yes it is still attached to the engine.
I will have to get a rev counter and check the rpm and get back to you. I will not be back where my buggy is for a week or so.
From what I have been reading on the forum it looks like I will gain some top speed from the 22" tires I will be putting on with a lift kit and loosing some bottom end so I really want to get that bottom end back and up it a bit. seems like I am talking in riddles here