426 ?

[400exshop]

what is the best way to go about boring the cylinder for the 426 ?

sleeve it then bore it to the 426 or can it be bord then later if need be sleeve it so that the cylinder will still be use able ?

THANKS FOR ANY INFO......

[honda400ex2003]

the ideal way to do it is to put a 426 sleeve in it but they are getting harder to find. it gives more sleeve to help with heat and dissipation of that heat with a thicker sleeve. Im not sure what you could bore a sleeve to though, i dont think ive heard of anyone actually boring a 426 sleeve over to tell you the truth. you could probably get another 426 with over rings on it if it wasnt bad enough to need a bore but there really isnt much left after a 426 up to a 440. someone has a 88.5mm that would work in it with a bore though most likely. JE has one for sure but im not sure what the deal is with them.

99% of the guys running a 426 just bore the stocker out and run it that way. as long as it is cooled well there really isnt a whole lot of issues with them when done correctly.

steve

[DragonGunner]

I bored mine to 428 or what ever u want to call it in the stock sleeve, ran a Wiesco 11:1 for over 2 years, ran an raced it hard. Ran perfect an when I decided to go to a 440 (wish I hadn't) the piston an cylinder was still in great shape, I did run 100 octane aviation fuel, very clean...

[jtalleman]

i have a je 426 12.5 to 1 and stock cooling and i love it never had a problem and i just bored out the stock jug

[400exshop]

Originally posted by DragonGunner
I bored mine to 428 or what ever u want to call it in the stock sleeve, ran a Wiesco 11:1 for over 2 years, ran an raced it hard. Ran perfect an when I decided to go to a 440 (wish I hadn't) the piston an cylinder was still in great shape, I did run 100 octane aviation fuel, very clean...

whats wroung with the 440? I had one till the rod came a part. now we are building a 426 and a 440..... trust me when I say this my 440 would flat out fly..... and put out some sweet mph around 85mph.

Thanks for the info.

[DragonGunner]

Originally posted by 400exshop
whats wroung with the 440? I had one till the rod came a part. now we are building a 426 and a 440..... trust me when I say this my 440 would flat out fly..... and put out some sweet mph around 85mph.

Thanks for the info.

I needed to change to heavy duty studs with the 12.5:1 440 an didn't...messed up my cylinder an now have a 406 which is faster....sorry but I don't trust your 440 goes 85mph....its gearing an not a 440 that makes a ex faster on top...unless your running 16/34 sprockets with 22" tires.....an then your your going to be so slow on bottom...

[tri5ron]

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Originally posted by 400exshop
whats wroung with the 440? I had one till the rod came a part. now we are building a 426 and a 440..... trust me when I say this my 440 would flat out fly..... and put out some sweet mph around 85mph.

Thanks for the info.
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I needed to change to heavy duty studs with the 12.5:1 440 an didn't...messed up my cylinder an now have a 406 which is faster....sorry but I don't trust your 440 goes 85mph....its gearing an not a 440 that makes a ex faster on top...unless your running 16/34 sprockets with 22" tires.....an then your your going to be so slow on bottom...

"Never argue with an idiot, they will just bring you down to their level, then beat you with experience."

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