Who now this engine

[Shnapsou]

Hello everybody!
Who now this engine?
Thanks

 

[Quinc]

Early atp 800 setup? Or maybe wdk?

 

[TheBuzzard]

That's a Polaris Octane adaptor plate bolted to what is obviously the 3 bolt pattern of Polaris cylinders. Not sure what cylinder that is with the powervalve blanks and bolted on those yami cases. Polaris cylinders are individuals as far as I've seen

 

[Shnapsou]

Ok thanks.
The seller says is power factor engine with snow bike cylinders. I search more info before to buy

 

[Storbeck]

Super intriguing. Those look like polaris MSX140 cylinders modified to fit on a yamaha case.

 

[800750]

Let us know what he tells you, very interesting motor. I'm almost positive the jukishes ran something identical to that when they won amateur freestyle

 

[Big Kahuna]

Let us know what he tells you, very interesting motor. I'm almost positive the jukishes ran something identical to that when they won amateur freestyle

Think the EME motors that Mark Baxter use to setup were Polaris based...

 

[Storbeck]

I happen to have one of those cylinders handy and taking a couple of measurements that's a very custom motor. CTC is stretched out bigger than stock Yamaha, estimating from the picture I'd say around 124mm ctc. Very cool. Nice looking ports in the Polaris cylinder, probably makes a lot of power but that's going to be WAY custom not easy if you need any parts! I wonder what bore and stroke is.

 

[TheBuzzard]

Ok thanks.
The seller says is power factor engine with snow bike cylinders. I search more info before to buy

Mark Baxter was power factor and he was the Polaris guru so that could be some of his work. I had his phone number and talked to him years ago about an octane I got and he worked on. Maybe you could track him down. It couldn't have been much of a beast with that single carb setup on there

 

[Shnapsou]

inside.
Thanks for all of this answer.
I continue to search more information

 

[Storbeck]

Have you measured the bore and stroke?

 

[TheBuzzard]

Yea with those tripple exhaust ports it kind of looks like 140 cylinders but I'm not sure. Some fool running a single carb on that makes zero sense