[you can change 440 to 426?] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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you can change 440 to 426?
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Posted by: Toyorider

it might be a dumb question but im picking a used 440ex and read that you can use a 426 piston is that correct? i heard the 426's were a lil bit better than the 440. and can you still run pump gas on a 426 cause i already have to carry enough race fuel as is with my other quads. sorry new to the 4 stroke world. still rocking my 2- 250r's (1 with ct330 kit!)

Posted by: Dupontster

You'll have to resleeve to a 426 bore...440 bore is bigger so a 426 piston wouldn't work...You can run pump gas but ours runs better on camll....It might run hot on pump so watch it close....

Posted by: underpowered

waht gas you run depends on your compression. i have an 11:1 426 and run 93 pump gas in it. it runs great and i only get a little pre-det on the hottest of days.

Posted by: Toyorider

how much is a new sleeve and is it something i can do myself? can i change it to a 416?

Posted by: Dupontster

Yes, you can get a 416 sleeve but you should get a machine shop to put it in....They will need to hone it to your piston too...Not sure exactly what a new sleeve would run...