welcome to the forums. your biggest hurdle ?, keeping the motor cool !. this engine is air cooled, with it being enclosed like it is ?, it will over heat quick !. need a cooling fan on it ?, or some kind of water cooled system.
Pretty sure the mules etc are water cooled, we have a JCB UTV and that is watercooled.
I’d fit two 12” kenlow fans just in front of that engine with a thermostat and on/off switch, better to be over cooked than under. A stock cooling fan justbwouldnt be up to the job IMO.
Here’s a link to the Kenlowe webpage, it appears they no longer do retro fit fans but still offer a good variety and are proven to be an extremely good fan in all weather conditions. I’ve used them myself in the past.
Thanks for the reply and yes I'm aware of the cooling situation lol I plan to cut vents in both sides maybe do like a wrx hood scoop style with fans behind of that's not enough I'll have to try something else my plan for this build is for a fun yard machine I won't be trail riding so hopefully the fans will be enough
I have a ongoing project similar to yours , it was a EZGO Workhorse that was had a Kawasaki 350cc , air cooled , clutch driven cart --------- go to Buggies Gone Wild , then big block /atv engine swops and you will find all kinds of cart and buggy projects
here is a link to my build on this site , also the Buggies site