Honda 400EX Dyno Runs

Stock 400EX with aftermarket exhaust and no air box lid compared to same with White Bros. cam. To make the cammed engine run right we had to go to a 160 main jet but I left this run with a 155 main jet.

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My latest 400EX setup compared to a 1999 YZ 400F.

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Modified TRX400EX with stock exhaust compared to same with Graydon Proline exhaust.

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Modified 400EX with stock cdi compared to same with White Brothers cdi. Note I chickened out at 11,200 RPM.

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All stock 400EX compared to same with 425 big bore, 88mm Wiseco piston 11/1, GT cam, Intake kit and Garaydon proline exhaust.

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All stock 400EX compared to 440EX (89mm 12.5/1 Piston), cam, custom header, intake kit and mild porting. Note: Stock carb

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TRX 400EX with intake kit, new cam and slip-on silencer compared to same adding 30mm LECTRON carb.

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TRX 400EX all stock compared to one with intake kit, new cam and slip-on silencer.

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All stock YZ400F hitting rev limiter at 11,600 RPM compared to a highley modiried TRX400EX hitting rev limiter at 9,200 RPM. It's a shame that you have to spend mega bucks on the Honda. If you want detailes on the TRX mods, feel free to contact me.
LS

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O-ring chain compared to Non-O-ring chain

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Stock TRX 400 EX as received from Honda compared to one with GT Thunder intake and jet kit installed.

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Stock TRX 400 EX as received from Honda compared to one with the air box lid removed

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