awd cr500 afc

tweav · Post by **tweav** » December 18th, 2007, 1:22 am

how close do you think christini's crf450 kit would come to fittting on my 2006
crf 250x chassis ? here's a link to their site.

http://www.christini.com/awd-technology.php

I was just thinking It might be fun

dannygraves · Post by **dannygraves** » December 18th, 2007, 8:17 am

if you have that kind of $$$ go for it, it comes with a frame, you should be able to put the rest of your stuff on, and convert the frame. the bike would be worth $$$ afterwards, an AWD cr500af

I just hope the system could handle the 500 power

ShanMan · Post by **ShanMan** » December 18th, 2007, 9:48 am

I agree, you should be very worried about how much more torque the CR500 can make over that of a 250cc four stroke. I guarentee you that his system has very little margin due to weight control. The good news, is that they have already developed a system that works on a 450, which is a better match power-wise.

britincali · Post by **britincali** » December 18th, 2007, 10:07 am

I wonder if it would torque steer due to the gears and stuff mounted on one side of the tripple.

dannygraves · Post by **dannygraves** » December 18th, 2007, 10:24 am

I would think so since it looks like both sides spin the same direction, so it would pull the steering in the same direction.

TJC510 · Post by **TJC510** » December 18th, 2007, 10:59 am

The specially coated drive shafts are telescopic and incorporate linear ball spline bearings. They are counter rotating to eliminate torque effect. They run the length of the fork to the front hub.

i thought about this, thinking it would be a ultimate offroad bike. tweav, they do make a 250x kit, infact it was what they used for their prototypes.

Post by **AlisoBob** » December 18th, 2007, 11:01 am

When you gas a 500, the front gets so light, front tire traction must be an issue.

dannygraves · Post by **dannygraves** » December 18th, 2007, 11:09 am

this thing would be great for really rocky rutted out ST. Whenevere the rear tire would start spinning the front would grab, I imagine it would take a lot of work out of it.

britincali · Post by **britincali** » December 18th, 2007, 11:13 am

dannygraves wrote: I imagine it would take a lot of work out of it.

Unless it tries ripping the bars out of your hands every time it bites.

ShanMan · Post by **ShanMan** » December 18th, 2007, 11:15 am

dannygraves wrote:I would think so since it looks like both sides spin the same direction, so it would pull the steering in the same direction.

As I understand it, the shafts actually counter-rotate and thus eliminate the effect of torque-steer. The design has been seriously scrutinized and seems to be holding up pretty well.

I personally still like the hydraulically driven setup developed by Ohlins and Yamaha (several bikes of this configuration have competed in Paris-Dakkar) but understand that the cost is astronomical by comparison to the mechanical Christini design in smaller quantities (for each).

dannygraves · Post by **dannygraves** » December 18th, 2007, 11:16 am

britincali wrote:
dannygraves wrote: I imagine it would take a lot of work out of it.
Unless it tries ripping the bars out of your hands every time it bites.

sounds like fun to me

Nodge · Post by **Nodge** » December 18th, 2007, 11:24 am

It doesnt torque steer.
There are two shafts down the front forks; one on either leg.
They turn in opposite directions to cancel out the rotational forces.

The front hub is driven at a reduced speed and free wheels as long as the back wheel has traction. Once the back wheel is spinning and you start to slow down the clutch in the front hub grabs and puts power down through the front wheel.

The november issue of Dirt Rider has a small write up on the 250f version.

Sounds like the reliability of the front hub still isnt spectacular, and the weight is still a down side.

It nearly doubles the price of a CRF 250.
I'd love to try it out.
Just think of how fun it could be to run TWO paddle tires in the sand!

tweav · Post by **tweav** » December 18th, 2007, 1:49 pm

I called them today. they said they have to think about if they'll do it or not . on top of it all it makes the fuel tank even a harder fit , because of the drive shaft. they said they want to have it before I put the 500 motor on it so their frame jig fits the motor mounts. Do you guys know how close the cr500 output shaft is to being in the same location as the crf250x's ,in relation to the to the swingarm?

BannedCR500Riders.com

awd cr500 afc

awd cr500 afc