Do yourself a favor and swap to the manual petcock. The vacuum type are problematic to say the least. The theory is sound on paper but rarely works long term and will drive you batty trying to troubleshoot.
As for tires they say 22s are the biggest you want. In the front it's the biggest you can fit without rubbing problems. On the rear anything bigger sucks the power out the engine. That said I'm running 23x8-11s on honda atv rims on my kinroad. I was lucky and got a buggy that has the same pattern front and rear so I was able to run the factory rims I pulled off my 4 wheeler. Those just happen to be the smallest you can easily find for the oddball 11 inch rim. They do rub on my front when I turn it hard.
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