Horsepower estimate

7 replies to this topic
  • 76Datsun280z

Posted December 25, 2006 - 12:12 PM


I was wondering if I could get an estimate of what the horsepower might be on my 99' Honda XR650L. It's got Dave's carb modification to it and also has a White Brothers E2 exhaust on it, and those are the only two modifications to the engine. What kind of figure would you guess it would bring?

  • oldKTMer

Posted December 25, 2006 - 03:24 PM


I don't have the numbers right off hand, but I think I recall somewhere in the ballpark of 5 to 10 percent over stock sounds right with intake opened up, rejetted, and a good exhaust. Numbers don't matter much to me, if it is fast enough for you then it must be enough

  • rebelventurer

Posted December 25, 2006 - 07:43 PM


Depending on elevation, at least 38 maybe 40

  • frankiewhipit

Posted December 25, 2006 - 08:04 PM


my '99 is set up the same way, i always wondered what the actual HP is. whatever it is, I'll take more :thumbsup:

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  • BWB63

Posted December 26, 2006 - 03:19 PM


Rear wheel horsepower on a dyno was 38.4 for a bike almost just like this one. Stock just off the show room floor was 29.7 1996 XR650L Later with a 10.25:1 102.4mm piston cam, open header/muffler was 48.7

  • tommyj92028

Posted December 26, 2006 - 07:31 PM


PROBABLY ABOUT AS MUCH AS YOUR DADS 86 XR600 DID!!! :confused: :crazy: :lol: :confused:

  • oldKTMer

Posted December 26, 2006 - 07:37 PM


PROBABLY ABOUT AS MUCH AS YOUR DADS 86 XR600 DID!!! :confused: :crazy: :lol: :confused:


  • 76Datsun280z

Posted December 27, 2006 - 11:40 AM


[QUOTE][Probably 1/3 less than your dads 86 xr600 because a 650l holds a 1/3 less oil than your dads xr600. Don't take it personally, just kidding./QUOTE]

My dad does not own an 86 xr600, he did own an 84'xl600 that he sold last summer.

I'm just going to leave this forum if you guys keep this up.

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