400ex bored out to the max - Honda ATV Forum
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post #1 of 5 (permalink) Old 10-20-2012, 01:36 PM Thread Starter
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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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post #2 of 5 (permalink) Old 10-20-2012, 03:29 PM
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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

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

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post #3 of 5 (permalink) Old 10-20-2012, 03:44 PM Thread Starter
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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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post #4 of 5 (permalink) Old 10-20-2012, 08:40 PM
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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.

92 honda 250x
99 honda 400ex
400ex upgrades
440 big bore kit
11:1 compression piston
stage 3 hot cam
04 450r carb
P&P head
LRD full system pipe
EHS racing outerwear filter for air box
Kn air filter
4" spal fan
nerf bars
ac front bumper
tech 4 tires
itp rims all the way around
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post #5 of 5 (permalink) Old 10-22-2012, 08:41 PM
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what are you running for compression..
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