So I just bought an ARGO (see vid below not me but one just like mine.) This thing has an 18hp Vanguard V-twin, it uses a CVT trans. It's a 2004 model that has been neglected, and i'm trying to resurrect it. It needs a little "wake up Call" if you know what i mean. It's bone stock, it has poor throttle response, but seems to have decent power. I'm not wanting radicle, I just need low end grunt. Mid range pull would be good too. I'll be using this thing to climb hills, go through muddy rice fields, and haul dead animals out of the woods.
However, I can't have this thing too extremely loud, because it's a hunting vehicle. However, Its so quiet now you can barely hear it at idle.