since 2003, I've built or had built an 800cc motor twice and one 840cc, for a kawasaki kfx 700, the stock radiator worked fine for that, but that quad weighed 500 lbs. the teryx being 1300 pounds might require a bigger radiator, although it does have a bigger fan and radiator than the quads do,if you were going to be riding it hard in temps above 80, I would say a bigger radiator is a good idea. 800cc by it self is not going to give you much, you need to port the heads change cams.
sincity
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Muzzy 800cc kit
Linear Mode
