i was woundering waht the top spedd of a 400ex is with a k&n filter and an hmf slip on pipe like how fast does it go
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Senior Member
i was woundering waht the top spedd of a 400ex is with a k&n filter and an hmf slip on pipe like how fast does it go
Tom
i got a stock 07 400ex
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will only go as fast as stock unless you tinker with gearing or tires. so about 67-68mph.
At least mines paid for!
pipe and filter dont give you more speed, they just get you to top speed faster. A guy I know rode his down the road past one of the radar things that the cops set up to let you know how fast your going and it said 67.
Junior Member
Most of the replies you have gotten are fairly accurate. The top speed on a stock 400ex is 67-69. But my buddy bought one that we clocked with his dad's police radar gun and it runs 71. Some motors just come out of the shop that runs faster but my 400ex ran 68 when it was stock.
04 400ex( Duncan CDI Ignition, Ex-treme Racing lowering kit, wheelie bar, a-arms, 6+ swingarm, K&N(of course) Jet Kit, 86mm 10:1com piston, Hotcam stage 2, Fatboy4 full exhaust, nitrous kit, 16 tooth front sprocket, stock rear sprocket,HD valve springs, 8 plate clutch assembly) little bit more but not much
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