When I still had my 400EX I went riding with a guy I know who has a V-Force. My 400 had a White Brothers full system, K&N air filter and jetted with no air box. He was bone stock. We never raced but I rode it and it didn't seem all that fast. I'm sure he would have beat my 400 but it didn't really feel like it was that fast. Since then he changed the clutch springs, full exhaust sytem and sent the engine out to be built. It has cams, big bore and porting. I haven't seen it since but suposedly it dyno over 70 horse at the motor. I'm sure the belt/shaft drive absorb some of that plus he pulls a lot of weight around. Still bad ass I'm sure.
08 Outlaw 525s
07 CRF70
04 Harley FLHRCI
04 TRX90
03 XR650R
03 400EX- XR650R engine
02 XR100R
01 Banshee
00 XR50R
00 XR70R
99 PW50
99 JR50
96,95 Sportsman 400
95 Xplorer 400
94 Indy XLT
87 Trail Boss
86,86,86,86,86 Scrambler
86 TRX70 x2
85 ATC350X
85,84 ATC250R
85 Red Tecate
85 LT50 x2
84 XR500R
84,84,84,84,83,82,80,79 ATC70
82,79 XL500R
83 ALT50
79,78,77,77,76 XT/TT500
76,75,74 XL70
72,71,71,71 SL70
72 Harley FX
72,71,70,70,70,70,70 CT70H
72 SL100
70,69 Z50