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Hey Ya'll watch this!
My 400ex is starting to smoke. So I figure I will probably bore it this winter. Probably to a 406. I want to keep it reliable and run on pump gas. Kinda a budget rebuild. I already have a hotcam stage 2 for it. That is the only motor work done to it. I guess I just want to know what all I will need or your suggestions. Thanks, Kyler
2005 400ex, Razr MX, Douglas Red Labels, AC pro peg nefrs, Moose handlbars, HMF Sport Series slip-on, G-Force +2+4 axle, 450r front shocks, CNC Stabalizer
1985 ATC 125M, All stock except for stock 400ex rims and tires on the rear.
20?? Chinese Atv. Got it for FREE!!
Code Red Racing #23
a 406 will be a nice addition for you then with the stage 2. depending on the gas you want to use 11:1 93 octane, 10:1 89 octane is your choices. you could probably get away with 87 on the 10:1 and 91 with the 11:1 if that is what you need to run cause that is all you can get at the pump. anyway either one you will be happy with in my opinion. steve
2019 Maverick X3 XDS Turbo R
2003 TRX 400EX
2016 HONDA RANCHER
Ride Red
416 IMO still reliable same cost and reliable. i suggest , valve seals, 450 cam chain, and new cam chain tensioner
QUADLESS
2008 450r SOLD
2004 416ex 11 to 1, stg2 cam triple rates SOLD
Senior Member
they make a 406 bigbore? id go with the 416 its plenty reliable if put in right and broken in correctly
-04 400ex
-protaper countor's w universal mounts
-tusk peg nerfs
-swinger skid
-full body skid
-big gun evo r slip-on
-msr levers
-tag clutch perch
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Cornholio!
yes, a 406 is an 86mm piston and bore. why not save a bore? the gains from the extra 10 cc's will be minimal.. i agree on the 10:1 compression though.
~Mike~
2000 Honda 416EX
Senior Member
Kyler mine had the 416 and ran good and reliable. It had the 10.8:1 and I always ran pump 93 with the cam. The valve seals are a good idea and I remember reading about the chain after I did mine.
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Registered User
I just went through the same thing. I had the head rebuilt, valves ground and new seals installed. I bored mine to 406 and I am running 10:1 but with the stock cam.
I dont see any reason to go on up to 416.
And I also swapped to a CRF450 timing chain. Mine acted fine length wise, but you could see where it had started slapping the sides of the case some. I was intimidated about swapping it at first, but it really is a very simple process. The hardest thing about it was sitting there taking the time to clean the old gasket off.
2004 Honda 400ex, 11:1 406, everything else is stock, maxis razrs
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