Improved torque?

3 replies to this topic
  • Ramcc4x4

Posted December 18, 2005 - 12:18 PM


I was having a conversation the other day about horsepower mods for the XR650R and it got me thinking: are there specific modifications that will significantly INCREASE the bottom end torque of the XR650R?

All I can really think of is a big bore kit or lowering the gearing which would obviously not increase torque output from the engine but would increase torque multiplication. From what I understand there are a few slip-on pipes that might improve torque across the entire powerband.

Any other ideas? Dyno proven?

  • roadcam

Posted December 18, 2005 - 12:57 PM


most pipes tend to increase the mid, and upper rpm ranges ... very seldom hear of anyone looking for more low-end torque on these thumpers, hard enough to stay on one as it is ...

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  • TimBrp

Posted December 18, 2005 - 04:40 PM


The only pipe I've read that added some bottom end grunt was the White Bros. E-series...

  • xrmoto

Posted December 19, 2005 - 04:35 AM


Going to a high compression piston will give you more torque.

My xr650r with Hotcam stage 1, Mikuni TM40 Full Ackrpovic and 11.1 piston, with ported head makes 47 footpounds of torque

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