XR400 hp?

[twsnow]

How much hp does a stock XR400 have.

 

[highmileage]

In Gordon mod trim it is right in the area of 30.5-31.5 hp with it making its horsepower and torque below 7500-8000 rpm with a complete drop off to the limiter. They put out the same as a 250F with about 2x the torque. Generally, the 250F's need to be above 6000 rpm to make there power/torque.

The best mod on the XR 250/400 (bar none) is additional cc's.

 

[Patman]

I think moderate additional displacement with a good exhaust and some head work make for the best combination. The stock head pipes leave a bit to be desired for flow especially before the welds being cleaned up. Going nuts trying to make the XR4 or XR250 for that matter competative with the new F bikes defeats the purpose of the XR which is to run for 100 years after the sun burns out with just oil & filter changes. :)

 

[SFO]

do you want a bone stock dynojet chart?

 

[Patman]

Sure, that would be interesting to see. :cool:

 

[twsnow]

That would be awsome!!

 

[SFO]

My friend Dyno Dale is waylaid via team suzuki DT fuel injection work.

http://groups.msn.com/JGPhotowerx/greenvilleohioamanational.msnw?action=ShowPhoto&PhotoID=489

I'll have him puruse his vast databank upon his return.

 

[RCJ81]

Any 250f these days is putting out around 35. Stock XR around 33.