Does This Look Right?

5 replies to this topic
  • honda_best_789

Posted March 01, 2009 - 07:54 PM


Im looking for a bike for my older brother and came across this spec sheet....

the horsepower spec is what i saw and what didnt make sense to me but i dont know about these bikes so maybe im wrong? thanks

  • FinchFan194

Posted March 01, 2009 - 09:18 PM


Pretty sure stock was 48 not 58 either way its not 58. Probably somewhere between 48-51 at the most.

  • erickdj

Posted March 01, 2009 - 10:21 PM


I'm thinking more like 45hp. 50+hp is newer 450 territory.

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  • grayracer513

Posted March 01, 2009 - 10:59 PM


If those were Yamaha's original spec's the power given is measured at the crankshaft, and may have been 58.

  • honda_best_789

Posted March 02, 2009 - 09:55 PM


yea i was thinking crank hp aswell ok well since this would be his first bike (wont go any smaller because he thinks he has to have a faster bike than my yz250) 48 is too much for him im thinking a 250f as his starter bike because he would foul any two stroke he rides


  • matt4x4

Posted March 03, 2009 - 05:22 AM


Grey is correct, Yamaha rated the 400 to be 54 HP - and for those numbers to be correct they have to be taken at the crank, not the wheel.

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