400ex 416, 426, or 440? - ATVConnection.com ATV Enthusiast Community



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  #1  
Old 07-28-2009, 08:21 PM
Range Rover
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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
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Old 07-28-2009, 08:43 PM
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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.
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Old 07-29-2009, 12:30 AM
Range Rover
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Thanks. Regular gas as in REGULAR, or like high octane?
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Old 07-29-2009, 11:15 AM
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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.
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Old 07-29-2009, 01:26 PM
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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
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Old 07-29-2009, 04:32 PM
Range Rover
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ok thanks for the info.
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  #7  
Old 07-29-2009, 06:57 PM
Red Rider
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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!
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Old 07-29-2009, 07:57 PM
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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.
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Old 07-30-2009, 09:59 AM
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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.
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Old 08-09-2009, 02:53 PM
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Are the 440s still unreliable if you go with a whole new aftermarket cylinder?
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