440ex

[TRXNIGHTRIDER]

i want to bore mine out to a 440 but ive noticed that more people run a 416 or 426 than a 440. Is it that much more reliable, or does those give out more power than the 440?

[WickedATVer]

depends on what you want to do. you can have the stock cylinder bored to 416 or 426 without replacing the sleeve to get a 440 bore you have to resleeve your cylinder. I have 426/88mm bore and piston and it was a noticable differance from the stock bore. I've read on here that the 426 rev up a little quicker than 440 but its also said to have heat trouble from the thinner piston walls mine hasn't had horrible heat issues yet.

[krt400ex]

the 440 has loads of bottom end, and the 426 and 416 have a pretty even power spread. the 440 is not unreliable if u build it right. the 426 and 416 are prolly more popular because they r easier to build

[PismoLocal]

I have a 440 and I have no complaints what so ever. Im doing a rebuild shortly though because I have a 440kit with a stock cam. I don't have HD headstuds installed right now and I have never blown a head gasket.

[hondamanex400]

I bored mine out to a 416 when i blew the stock rings out. Now, when the 416 goes, (which will hopefully be a couple of years, since it has only 15 hrs on it), i will bore it to a 426, then a 440. when one blowes a 440, they have to get a new sleeve, because it cant be honed out like a stock sleeve.

[bayou boy]

never under estimate the lil 416....it can be a heartbreaker...;)