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When are someone going to try to build a bike with a Rotax V-twin 799.9 cc EFI engine

those are belt driven so if a guy was going to go that far wouldn't it make more sense to throw a 800 2-stroke say a rotax or a cat suzuki engine in a sled? weight would be about the same
 
Yes, it would be more power from a 2 smoker, but its much wider than a V-twin.
I know it would be a heavy moster compared to 450cc mx bike.
 
Cooters 700 raptor YZ450 frame bike was pretty impressive. Even more impressive when he put it in reverse and turned around on a tight road without ever getting off the bike. Apparently he will have it built up for next year and putting out a lot more HP. It looks almost factory in that frame he did such a good job.

Whatever gets done in the future one thing is clear: it has to come in under 325lbs ready to ride.
 
The Ski-Doo 600 Eteck would be a dynamite powerplant if it had a transmission.
 
transmission crisis

a nice powerful two stroke in the bike would be great, we know 120 hp or more no big deal.

The issue is finding a good stout lightweight transmission. If you use the belt drive, now you have the deal killer which is 17 lbs of foul play gyroscopic moronic random torque to fight. right back to snowhawk attitude.

4 strokes of all sizes have WAY to much gyroscopic issues to be agile, but that as good as it gets today.

big non vibrating two stroke single with 8 speed transmission, then its time to dig into the mad money account. Day will come. Hope I'm young enough to try one out.
 
V twin

Reliability, practicality, time, & weight can all be defeated if u throw enough money at it. I have seen many hybrids from 750-1000 GSXRs, rotax v twins, variety of 2 smokers, even a Buell Ulysses X12! But the reality of it is power to wieght ratio, that's why Allen, Tillbuilt & many others have gone turbo. One interesting project I am aware of is a 750 cc turbo charged v twin 4 stroke Aprillia.
 
CATSLEDMAN1 said:
a nice powerful two stroke in the bike would be great, we know 120 hp or more no big deal.

The issue is finding a good stout lightweight transmission. If you use the belt drive, now you have the deal killer which is 17 lbs of foul play gyroscopic moronic random torque to fight. right back to snowhawk attitude.

4 strokes of all sizes have WAY to much gyroscopic issues to be agile, but that as good as it gets today.

big non vibrating two stroke single with 8 speed transmission, then its time to dig into the mad money account. Day will come. Hope I'm young enough to try one out.
Click to expand...

I have limited time on snowbikes (radix kit around home on a berg 450,) so bear with me. I ride bikes all summer, street and dirt, and a turbo pro in the winter. But why on the snow would you want a gearbox? It seems like a hindrance if anything. After riding my 450 I of course, like most had all sorts of grand ideas about building the perfect snow bike (also the guy I bought it from was building a TL1000 with a MH kit, inspiring.) But CVT seems like the way to go. I found my with 6 speed berg half the gears were useless. Seems like a wider ratio four speed would be better, but it needs more power, so turbo, but then you just bounce off the rev limiter.

A light 2 stroke (maybe with a turbo,) in a small package with a CVT seems ideal. I realize that you don't manhandle a snowbike on a sidehill like a sled so the cvt isn't as important, but what makes sense about having gears to change in the snow?

Then again I enjoy the degree of skill it requires to throw a sled around, boondocking, sidehilling, downhill descents etc, hence why I have not jumped ship.

Spoken from a mountain riding standpoint only I should add.
 
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I for myself do not want a CVT. Really likes gears with my Rekluse. Makes almost no difference when shifting.

Also my new Husqvarna TE449 is a 6-speed close ratio gearbox.
Should be easier to find just the right gear with this one, compared
to my old wr450 -06 that had a bit to far apart the gears to really work great (or to little power of course to work the wider ratios.. :face-icon-small-hap )
 
Rush44 said:
Who makes a CVT style transmission that fits on a dirt bike? Nobody. That's the problem.
Click to expand...

Not exactly talking about building a conventional dirtbike here are we?? I was looking for some actual opinions on benefits of a gearbox for a machine on the snow, so far it seems 'thats how I like em.' I know personally I would never want a CVT on the street, so maybe I am just missing out on something in the snow?
 
Mx size gearbox is best at
-transfering power
-being small
-being narrow
-being light
-fitting in an existing frame

CVT would be 8 miles too wide.

Just gotta learn to shift. It ain't a big deal
 
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