A CRF/KTM hybrid 201lb 250cc Two-Stroke motocrosser

[vmx42]

Hey Guys,
Don't you wish that the factories would make something like this...









"I just wanted to share this amazing project with all of the two stroke fans out there. We just finished this factory level 2 stroke build after a year and a half of R&D, testing, changes, etc. The end result is amazing and we ended up with a 53hp rocketship that weighs 15 lbs less than the AMA minimum weight limit for that class! 201 lbs, ready to ride with an empty tank. We used a Varner Motorsports modified KTM 250 sx powerplant in a 2011 Honda 450 frame with production based Showa suspension including a SFF Showa fork, modified, valved and set up by MB1 Suspension. The entire engine cradle and billet engine mounts are hand fabricated and machined to accommodate the KTM powerplant. Racetech Titanium was instrumental in helping bring the weight down with all of their titanium fasteners, axles, brake piston and pivot hardware. The bike also utilizes many one-off titanium or alloy parts and heavily modified OEM parts as well. DLC coatings were utilized in many critical areas including the shock shaft, brake hardware and pins, brake pistons, select transmission parts, titanium linkage pivot bushings, and swingarm pivot bolt to name a few. It took over 500 hours of trial and error, testing, changes, extensive mods and many hours of scratching our heads to get it perfect but I feel this is the most refined 2 stroke conversion build anyone has ever done. "

You can follow the build at: http://twostrokemotocross.com/forum/general-two-stroke-talk/crfktm-250sx-hyrbrid-drool-worthy/

VMX42

[Rusty]

Works for me 

[Davey Crocket]

And me.

[Nathan S]

Cool, but what does it achieve above and beyond fitting a linkaged KTM250SX with lots of titanium bits?

[Viper79]

It won't suffer from head shake....

[vmx42]

Cool, but what does it achieve above and beyond fitting a linkaged KTM250SX with lots of titanium bits?

I would have thought by now that you would have understood that logic has no place on this forum!!!

The guy who constructed it did actually answer that question... from his measurements, the Honda based bike is 5lbs lighter than the equivalent KTM. Beyond that I think it was his dream bike and he is proud of the results...

I reckon its great and a terrific alternative to the wave of 4-strokes in the marketplace. It just shows what the Japanese could produce if they put their minds to it. Afterall they are all complaining about new bike sales being down, but all they do is recycle last years 4-stroke with minor evolutionary updates. If one of them was brave enough to lobby the rule makers and produce up-to-date 2-strokes they might just surprise themselves with the market response.

And if they don't I for one will continue to celebrate somebody doing their work for them!!!

[Nathan S]

Seems like a lot of work for 5lb, especially when you end up with a shitty aluminium frame...

Look at Yamaha - they haven't touched their 2T YZs in EIGHT years now (god-awful 2013 plastics aside), and yet the bikes are still just as competitive against their opposition (both 2- and 4-stroke) as they were back in 2006. *shrugs*

[vmx42]

Seems like a lot of work for 5lb, especially when you end up with a shitty aluminium frame...

Look at Yamaha - they haven't touched their 2T YZs in EIGHT years now (god-awful 2013 plastics aside), and yet the bikes are still just as competitive against their opposition (both 2- and 4-stroke) as they were back in 2006. *shrugs*

I will pass your details onto him and next time he wants to construct his dream bike he can give you a call for permission... 

[Slakewell]

If I was going to go to that much trouble I would have chosen a KTM 380 engine 

[35elsinore]

 Great bike, I for one would line up for a new honda 2 stroke if they seen the light. The most modern bike in my shed is a 98 WR250 2 stroke, its such a fun bike to ride. After all his time and effort, I hope he wares it out with a grin from ear to ear.

[firko]

As the self appointed chief batton twirler for the hot rod dirt bike movement, this bike rings my bells. Who cares about the logic of it, it's one mans concept of the perfect dirt bike and I respect his right to build it.
The cookie cutter sameness of the modern dirt bike design bores me shitless, this bike gives me hope that the good old hot rod, DIY mentality still exists out there in McMansion suburbia.

[Iain Cameron]

MMMM 490 Yam  in a modern frame that sounds like a good idea . But I love this bike looks like a shxx load of dollars have gone into it .

[TooFastTim]

I think it's a thing of beauty but I don't like aluminium frames!

[holeshot buddy]

Hybrid = good shit

best of both worlds

[Nathan S]

Honda parts prices and ?

I'm not trying to be negative, but I just want someone to explain why this is "better" than a 250SX with titanium bits?