Does anybody know what counter-balancing entails? Is the crank different? Or is something (weights) added to the crank?

 

just make sure the tranny is strong enough to handle the extra wheel

 

My uncle, Biff, had a 97 cr250 engine put in his 400ex frame. He strapped it to the front bumper, he said it really didnt matter if it was counterbalanced... he really didnt notice any power gains, and he kept nose diving off every jump really badly, but White-Trash-Brothers makes a kit to even out the weight, it consists of a big wooden block you strap to the rear grab bar, it goes for about 150, and comes with mounting hard ware. Good luck man.

 

BUBBAG...... an awesome frame design???? hmmmm... seems earlier in the "is the 400ex worth the money" post, you called the 400ex the biggest piece of crap ever... i see how quickly you change your opinion....
I love my 400!

 

Lets get educated. The 250R three wheeler did not have a CR250 motor. It had basically the exact same motor that came in the 250R fourwheeler. It was faster because it had one less wheel to push and a lot less weight.

Counterbalancing is a lot more complicated than making a few changes to the crank. The counterbalancer is a completely seperate item from the crank. It consist of a shaft with a weight on one end that is driven by a gear that is located on the end of a crankshaft. It would be virtually impossible to add a counterbalance to a CR motor. To do so you would have to make a completely new crank and completely new set of cases with room for the counterbalance not to mention the counterbalance itself.

You could always just bolt the motor into the frame after some heavy modification by it would crack the frame due to the vibrations. Also, a good used 400EX is worth a whole lot more money than some kind of CR/EX crossbreed.

 

I have read someting about team Kawasaki mounting a counterbalancer of some sort on a stock KX 250 engine for the KXF so why wouldnt it be possible to do the same to the CR motor???

 

Kawasaki did not do any such thing. That is the major problem with William's bike is that it does not have a counterbalance and vibrates like crazy. I have raced a local harescramble on one of Williams bike and ridden them numerous times and the vibrations are so bad it will make your hands go numb if you are not used to it. Just like the CR, there is no place to put a counterbalance on the KX motor without completely redesigning the motor. What they did try was putting a harmonic balancer on the crankshaft to see if it would help but it didn't make much difference so they took it back off.

 

Thanks for the information about the 250r three wheeler not having a cr250 motor in it. I stand corrected. About the kawasaki motor. I do know that the old tecate-4 motor had a counterbalancer on it. It does run the same piston as the kx-250 motor, so I believe the only difference between the kxf-250 motor and the kx-250 motor is that hte kxf had the counterbalancer and the kx-250 did not.

 

Your right on the old tecate motors as they were counterbalanced. I have no clue as to what the differences between it and KX motor were. I never had a Tecate nor rode one that many times.

 

Why does a Bike not need a counterbalancer when an ATV with the same motor require the counterbalancer? Does'nt the counterbalancer aid in low speed engine momentum for less stall-outs? By the way, I had a CR250 engine on a go-cart years back with the shifter and everything working! Fun until the big crash! Later!