My buddy has a 400 ex that he got bored out to a 440, it was done professionaly by a guy named dave marty. his 440 has everything imaginable done to the motor and his bike looks pretty good too. I have a 450r that has a stage 1 LRD power up kit. we have about the same experience. I weigh 160 lbs. and he weighs 185 pounds. well anyway he says his 440 is faster than my 450 and when he gets it broken in he wants to drag race me. he thinks his 440 is so fast he bet me 200$ to whoever wins this dragrace.

 

Take his $200 bucks and him him a beer and blow the other $198. You'll toast him.

 

u never know those 440s are quick. lol wait a minute you have a 450 dont worry about it u will take him to skul

 

Put me down for $10, on the 450r!

 

if hes a good rider put me down for 10 on the 440 other wise 10 on the 450r

 

450r should take that 440 my buddy has a 450r its vary fast. he even gread it down. but hes like 130 lbs.

 

not knowing the riders it's hard to say, but go 2 out of 3 so you know whats up, and no bad shifts cost you some money.

 

today me and a couple of friends were racing on my MX track and i got the holeshot and i won the 15 lap race agianst his 450r it had a HMF pipe but we switched and i won on his 450r so i guess the driver does has something to do with it

 

Hey YFZ, it depends on what is done to the EX. If it's just 89mm (435cc) with the stk cam and no porting you'll smoke him. If it's got a descent exhaust, stgII Hotcam or larger and some good porting your in trouble.
One of our 426cc EX with our porting, cam and exhaust (44rwhp on pump gas 11:1) was beating the TRX450's with various exhaust pretty bad last weekend at the drags. He was also beating the YFZ's. He won the 400-500cc mod class and finished second in the 500-600cc mod to an 400 Scrambler with and HPD power-Max full race engine (80hp) full race 400 two stroke can't run in the 400-500 class