IIRC, the KQ300 was actually 280 (or maybe 282) cc's. It was a great go-anywhere workhorse and with all the gearing options could claw it's way through almost anything. It's downside as a trail machine is the lack of power for any kind of speed and short suspension.

Jaybee

 

your tire size and all are right on

 

These specs are for an LT-250, the OP has an LT-4WD, which uses 25x12x10 rear tires.