[440 Big Bore Kit?] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

Pages:1

440 Big Bore Kit?
(Click here to view the original thread with full colors/images)

Posted by: eXpRo_дїї

Hey is a 440 Big Bore Kit worth the money? And about how much more seed will it add?

Posted by: RiderTRX400ex

it wont add more speed... you will just get there quicker...

unless you change your gearing or tire size.

from reading around here ive heard that 426 or 416 would even be a better choice.

Posted by: Joe400ex

next winter i want to do a bore on mine but i realy want to be safe and get 416 but how much more of problems is the 426

Posted by: 400exrider0004

Both 426 and 416 are more reliable than 440 if done right. I hear 440 have lots of problems

Posted by: prepracing

426 ( .120 over bore, I think ) is just one more bore than 416 ( .80 over bore, I think), only problem if you wear out the 426 is that is the last bore on your stock sleeve

Posted by: Christoph

is borin it out real hard on the engine, i heard it was, but i see most everyone has theres bored out, what would u recommend most 426??

Posted by: prepracing

I bought my EX and it was already a 426, I have ran it for 2 years now ( GNCC racing and Mid-South hare scrambles ) and not had any problems yet and am very pleased with the performance. As long as you maintain your quad regurlarly I would go for the 426 !

Posted by: K_Fulk

I would do a 440 over a 426 or 416. But thats just me.

Just the big bore alone is not going to do a whole lot.

Posted by: prepracing

I will put any 426 with a cam, port and polish, and pipe, airfilter, rev box beside a 440 with exact same setup and win 99% of the time.

Posted by: K_Fulk

You might win all the long drag races, but the 440 will pull harder out of every corner. And over the coarse of the race it adds up.

My tc426 pulls a little harder on top then my 440's did but the 440 had a lot more bottom with less compression.

Posted by: QuadJunkies

Like Ive posted before.. If your 440 is done RIGHT, it will last just as long as a 426 will. Ive had mine for several months now and I havent even blown a gasket

So far so good and IVe been very happy with it. I also like my 426,but Im finding after some gearing changes I like my 440 better

If I ended up doing any further mods to my quad(which I dont intend to do) Ill be doing a Stroker..

The 426 is great also, I have one on stand by in case I ever need it .

Posted by: 2004exrider

cant remember who it is, but someone on theis site said his 440 has lasted 4 yrs so far and still runnin great. but they do get hot faster and sounds like the main problem is head gaskets but they usually put in bigger head studs to help out. i personally would go with a 416 (11:1 so you can still run pump gas) with good mods, youd be happy. im thinkin of gettin 1 myself

Posted by: balls2da-wall

440...just go all the way...costs the same. Mine has lasted 2 full XC seasons and is still going strong! Never had a problem with overheating or blown head gaskets. I have a 440 with K&N filter and open air box with HMF slip-on...thats it! and it is real quick in tight woods!

Posted by: 400ex..xc

[QUOTE]Originally posted by balls2da-wall
440...just go all the way...costs the same. Mine has lasted 2 full XC seasons and is still going strong! Never had a problem with overheating or blown head gaskets. I have a 440 with K&N filter and open air box with HMF slip-on...thats it! and it is real quick in tight woods! [/QUOTE

Your head gasket just blew...but I would still go with the 440, he kicks my stock 400ex all the time

Derek

remember you need more bottom end in tight races like xc, you don't have to down shift as much, but in wide open areas the 416-426 would probly be better

Posted by: balls2da-wall

alright let me re-phrase that...you wont blow head gaskets as long as you have a metal layered gasket like the cosmetic gasket that comes in the kit...dont my metal flake gaskets!

Posted by: sam the brave

how would a 440 be for messing around and racing

i was thinking of a 426 or a 440 i still cant decide

Posted by: balls2da-wall

440...I race the heck out of mine and still take it to the dunes and to the trails! They are bullet proof as long as you dont go with compression higher that 11:1 and dont go wild with cams or porting.

Here it is...only things done to the motor are Wiseco 440 kit, ebc racing clutch and HD springs, K&N(open air box), and a HMF slip-on.

Here is a pic of her in action!
http://www.imagestation.com/picture/sraid169/p3b040b2a6c4066c69a6edd7352030e0d/f40cdf8c.jpg

Posted by: QuadJunkies

Im running the 12:1 and so far no issues!! Kinda sucks running a mix of race fuel though

Any of you tried the VP purple yet??? Ive been thinking of callingVP and asking wha the differences are between that and C-12 other than half the cost