450 hp numbers

[MP250r]

I was at work today and our shop is right beside a Mcdonalds, a big White Brothers Honda Peterbuilt truck pulls up in the parking lot. The driver jumps out and opened the side door, the whole truck was full of crf450s. He was headed to london, ky for a race. I talked to him for a few about the 450s, he said they run stock cams and pistons in thier bikes and run white brothers pipes and have some "head work" done to them and they make 58hp at the rear wheel. The truck had a california tag on it, they race a 4 stroke series. but im wondering if anyone else has gotten any dyno numbers on the 450s with some mods?

[norcal.z400]

no that guy is wrong!! its more like 65-70hp and if you add the HRC kit you will get another 20hp ... so you will be pushin 90hp.

but dont tell Windham .... cause his bike isnt near that much even with Hondas builders

[norcal.z400]

ok ... im done with the sarcasm ....

a stock CRF450R dirtbike has 55hp at the crank which means around 46hp and the rear tire. The stock pipe flows damn well and you can get 1 hp out of a pipe ... maybe

so ..... 11hp from head work is unlikely

Originally posted by norcal.z400
ok ... im done with the sarcasm ....

a stock CRF450R dirtbike has 55hp at the crank which means around 46hp and the rear tire. The stock pipe flows damn well and you can get 1 hp out of a pipe ... maybe

so ..... 11hp from head work is unlikely

What's a Z400 put out?

And, What does yours put out?

And, How much did it cost to get it to put out that much?

[Bretmd94]

im calling bs

[norcal.z400]

my Z400 put out a lot of HP for not that much money. I parted out my mods though and am selling the bike. I had 45-50 rwhp for under $1500

look on Z400central for some videos that I posted smart guy. I was intending to get a 450R .... but now am going with the YFZ

or just click here ....

[trueblue450]

Originally posted by norcal.z400
my Z400 put out a lot of HP for not that much money. I parted out my mods though and am selling the bike. I had 45-50 rwhp for under $1500

look on Z400central for some videos that I posted smart guy. I was intending to get a 450R .... but now am going with the YFZ

or just click here ....

Good choice!

Originally posted by norcal.z400
my Z400 put out a lot of HP for not that much money. I parted out my mods though and am selling the bike. I had 45-50 rwhp for under $1500

look on Z400central for some videos that I posted smart guy. I was intending to get a 450R .... but now am going with the YFZ

or just click here ....

Cool. Enjoy your YFZ. They are a real nice machine. And fast when modded too. WHat made you decide to sell the "ALMIGHTY" Z?

[RoadkillerRyan]

58 hp?? on the new 450 quad w/ hard work and a pipe??

[robby26wi]

take like 10 or more away then u are close