lt80 Top Speed upgrade
 

Is there a kit to increase the top speed of my atv without having to build an engine.

yep,

LT80 Hop-Ups

Get yourself a 13 and a 26 sprocket in 428 chain size. I then use #40 chain, it rolls so much easier.

that's industrial non o ring roller chain, right? do you have any problems keeping the tension in check?

Nope. It's cheap enough that as soon as it starts to stretch you throw another one on.

thanks