400ex rebuild - Club700XX - Honda TRX700XX Forum
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post #1 of 14 Old 12-06-2011, 08:05 PM Thread Starter
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400ex rebuild

So i bought the 400, it needs rings and a swingarm bolt. Out of the pile of parts I got that are the things I know I need. Well I wanna ask you guys who have them some questions. I have a white bros full exhaust and the rest of the big 3. My question is what would you do to the motor to have a nice reliable trail rig that will give a z400 fits. What should I replace or modify while it is in pieces. I have 2 other atvs so it doesn't matter when it gets done.


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post #2 of 14 Old 12-06-2011, 08:10 PM
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put a ims 440 kit an get the head ported an polish mine get as!!! forgot also got a new carb been a few years it will be a rocket
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post #3 of 14 Old 12-06-2011, 10:11 PM
 
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DO NOT GET A 440 kit!! Stick with a 416 or 426. They are more reliable and cause less vibrations throughout the bike. Do some sort of web cam with new rockers and valve springs and some port work. Stick with an 11:1 piston so you can keep it on pump gas and you will have a nice machine.

Pro Armor Fatpeg Nerfs
Pro Armor Skidplate
Razr 2's all around
Dynojet PCV
Curtis Sparks X6 Exhaust
PRM Desert II Bumper
CP 11:1 piston
WEBB 290 Cam
Ported +1 head by Bo White
HDD +3 Throttle Body

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post #4 of 14 Old 12-06-2011, 10:44 PM
 
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416 kit, carb job, and call it good. The 440 isn't a bad kit, but are known to not be nearly as reliable as the 416. The 426 I'm not too familiar with, but my 416 ripped.

2008 700xx; Power Bomb header with power core 4 exhaust, Power Programmer III, pro armor nerfs, prm products control front and rear bumpers and full skid, 10" ITP rears, ITP Baja's fronts, RZR 2's all the way around, Uni filter, 13t sprocket, CCP steering Damper, DS450 shock swap, Dual Gasser Throttle, bar risers and Moose barkBusters. 730XX kit plus other engine mods!
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post #5 of 14 Old 12-06-2011, 11:23 PM
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A bigger cam, 450R carb, 10 or 11:1 piston, plus the exhaust and filter it already has would be a great combo. That should be enough for a piped Z400, but if you think you'll need more then the 426 kit should be plenty.

2008 Honda TRX700XX
*Curtis Sparks X-6 Full Exhaust
*Power Commander V
*Pro Design Air Filter
*Elka Stage One Shocks
*Pro Taper Evo Bars
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*MSR Clutch Perch
*Powermadd Handguards
*ODI Rogue Grips
*IMS 5gal Tank
*Pro Armor XC Bumper
*PRM Full Skid Plates
*Maxxis Razr II Tires
*ITP Aluminum Rims

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post #6 of 14 Old 12-06-2011, 11:24 PM
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Don't get a 440! It's not that they're unreliable, but they kinda are and get way too hot, too soon. If you want a trail quad, the 440 is not the way to go. I have a 426 on mine, and love it. A good cam will open it up real well. By the way, there's a kit on ebay (have to look for the link) for a bolt and bushings real cheap.
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post #7 of 14 Old 12-07-2011, 06:10 PM
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Makes me wanna buy another 400ex! So much cheaper to build compared to the xx.


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post #8 of 14 Old 12-07-2011, 07:52 PM
 
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Quote:
Originally Posted by BuckeyeXX View Post
Makes me wanna buy another 400ex! So much cheaper to build compared to the xx.
That all depends on what kind of parts you buy.

Pro Armor Fatpeg Nerfs
Pro Armor Skidplate
Razr 2's all around
Dynojet PCV
Curtis Sparks X6 Exhaust
PRM Desert II Bumper
CP 11:1 piston
WEBB 290 Cam
Ported +1 head by Bo White
HDD +3 Throttle Body

Loud Pipes Save Lives
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post #9 of 14 Old 12-08-2011, 07:43 PM
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Originally Posted by jfdanie2 View Post
That all depends on what kind of parts you buy.
Very true but parts for the 400ex are a dime a dozen which means you can usually find deals on parts. The XX parts are few and far between when it comes to deals.


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post #10 of 14 Old 12-08-2011, 08:58 PM
 
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True true, parts availability is alot better for the 400ex and there are lots of things that are interchangable with other honda bikes.

Pro Armor Fatpeg Nerfs
Pro Armor Skidplate
Razr 2's all around
Dynojet PCV
Curtis Sparks X6 Exhaust
PRM Desert II Bumper
CP 11:1 piston
WEBB 290 Cam
Ported +1 head by Bo White
HDD +3 Throttle Body

Loud Pipes Save Lives
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