Go Back   ATVConnection.com ATV Enthusiast Community » Brand Discussions Area » Honda
Sign in using an external account
Register Forgot Password?
Search

Welcome to ATVConnection Forums!
Welcome to ATVConnection.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the ATVConnection Forums community today!


Reply
  #1  
Old 07-28-2009, 07:21 PM
Range Rover
2003 Honda 400EX
 
Join Date: Aug 2008
Location: Huntsville, Al
Posts: 179
Question 400ex 416, 426, or 440?

Hi,

I really want to rebuild my 03 400ex top end, (and up some hp's) and I was wondering what kit I should use if I still wanted to use pump gas.(I know it has to be the highest quality) I've heard bad things about the 440 kit, so I'm not sure what to do. How does this look? 426 cc 11:1 Big Bore Kit Honda TRX 400EX TRX400EX XR400:eBay Motors (item 270371507998 end time Aug-06-09 16:14:32 PDT)

Please give me any opinions or tips, or even links to the best kit. Thanks
Reply With Quote
  #2  
Old 07-28-2009, 07:43 PM
scrambler400enoge's Avatar
Shapeshifter Rider
Garage is empty, add now
 
Join Date: May 2008
Location: Mishawaka,Indiana
Posts: 4,033
Default

The 440's blow head gaskets and overheat. The 426 can be tuned faster than a 440. You should be good running regular gas with 11:1 compression. If you have the cash, go for it.
__________________
Gary Johnson 2012.
Reply With Quote
  #3  
Old 07-28-2009, 11:30 PM
Range Rover
2003 Honda 400EX
 
Join Date: Aug 2008
Location: Huntsville, Al
Posts: 179
Default

Thanks. Regular gas as in REGULAR, or like high octane?
Reply With Quote
  #4  
Old 07-29-2009, 10:15 AM
scrambler400enoge's Avatar
Shapeshifter Rider
Garage is empty, add now
 
Join Date: May 2008
Location: Mishawaka,Indiana
Posts: 4,033
Default

You could safely run anything from regular to premium. Any higher compression ratio, say like 13:1, you would need to run strictly 100 plus octane race gas.
__________________
Gary Johnson 2012.
Reply With Quote
  #5  
Old 07-29-2009, 12:26 PM
RallySoob's Avatar
Trailblazer
2005 Honda TRX450R
My Garage
 
Join Date: Apr 2009
Posts: 27
Default

I ran my 440ex hard as f' for atleast 2.5yrs with just regular oil changes. Never head a blown anything, never had a reliability problem period. I just used the basic IMS Kit with stage 2 cam and titanium valve springs. It was fast, probably 48-52hp. definately a banshee beater up until the banshee hit 6th gear on the flats ofcourse but hill shooting was it's specialty. gear down with 10 paddle haulers ftw
__________________
Reply With Quote
  #6  
Old 07-29-2009, 03:32 PM
Range Rover
2003 Honda 400EX
 
Join Date: Aug 2008
Location: Huntsville, Al
Posts: 179
Default

ok thanks for the info.
Reply With Quote
  #7  
Old 07-29-2009, 05:57 PM
Red Rider
Honda, accept nothing less!
Garage is empty, add now
 
Join Date: Dec 2002
Posts: 12,734
Default

If you want longevity, go 416. If you want a timebomb, go 440. If you want a compromise, go 426.

If you need a rebuild you need a rebuild.....but to hop up an old school EX makes no sense in this day and age when there are so many higher performance machines out there!
Reply With Quote
  #8  
Old 07-29-2009, 06:57 PM
91Warrior357's Avatar
Pro Rider
1994 Jeep Cherokee
My Garage
 
Join Date: May 2008
Location: Purcellville.
Posts: 1,860
Cody Burbage Codizz88
Default

426 would be my pick they can be tuned in real well and still be pretty reliable, ive seen a few of those that flat out hauled a$$, the 440s "can" also be good but they are prone to head gasket probs and overheating if not done right, some people have 440s that are just fine with no problems its just that they are known to run into problems sometimes with 440s.
__________________
2001 Banshee: Bored .020 Over, Vitos SS Pistons, Toomey TR-6 Pipes, K&N Pro Flo,Pro-Design Head 21cc domes,+4 Timing, Modded Shift Star...Etc etc.
2003 Banshee: Bored .080 Over, Wiseco Pro-Lites, F.A.S.T. Coolhead 21CC Domes,28 PWK Carbs, DMC 916 Pipes, Ported, Hotrods True/Weld Crank, VF4 Reeds, +4 Timing, UM Alum Airbox, K&N Pods /w Outerwears....blah blah too much to list.
2005 Rancher 350 4x4
Reply With Quote
  #9  
Old 07-30-2009, 08:59 AM
Koopa's Avatar
Pro Rider
Is addicted to 4 wheel'n!
2004 Yamaha YFZ450
 
Join Date: Apr 2007
Location: Chickasha, OK
Posts: 1,805
Default

I agree with recon. Do the 416. If it wears down go 426. The differences between 416 and 426 is so little that it's not worth it.
__________________
2004 YFZ450
Barker Full exhaust
Dinged Rim
Scratched Plastics
Custom blood stains
Now with cam mod!
Reply With Quote
  #10  
Old 08-09-2009, 01:53 PM
Weekend Warrior
Garage is empty, add now
 
Join Date: Aug 2009
Posts: 1
Default

Are the 440s still unreliable if you go with a whole new aftermarket cylinder?
Reply With Quote
Old 08-09-2009, 01:53 PM
Reply

Tags
400ex, 416, 426, 440kit, blown, cam, cc, dyno, honda, hot, jet, jets, kit, piston, rebuild, stage, tips



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On