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Old 10-20-2012, 01:36 PM   #1 (permalink)
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Talking 400ex bored out to the max

So my 99 400ex is almost done it rebuild, its bored out to the max. It has the biggest piston you can get for it, and it is bored to .80 over. I'm just wondering how much more power will it have over the stock engine?
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Old 10-20-2012, 03:29 PM   #2 (permalink)
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You should see a significant gain in power, but if you haven't changed the cam, carb or exhaust you are robbing the engine of its full potential
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Old 10-20-2012, 03:44 PM   #3 (permalink)
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It has a slip-on yoshumara pipe and a k&n filter how much extra will you get from that?
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Old 10-20-2012, 08:40 PM   #4 (permalink)
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you should get a carb for it to. The carb really holds a 400 back i put on a 450r carb and it really woke it up and they are not that bad to put in.
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Old 10-22-2012, 08:41 PM   #5 (permalink)
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what are you running for compression..
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