Stroker 440 ?

[badA$$440EX]

I have 99 400EX with an FMF Powercore 2 pipe, Stage II cam, K&N Air Filter, and I want to make it a stroker 440 ... what all do i need im not really looking for drawbacks or anything id just like a list of what i need

[badA$$440EX]

my last 400 i had a bored 440 and i know well i kept the stock rod and well ... you all know what happens... so i dont want to go that route again

[Extremeracer167]

To get a 440 stroker motor, depending on how the engine builder does the crank. You should use the stock bore, and the stroker crank gives u the extra 40cc. To go to say a.......465 then u would go 120 over and that would give you the 460-465cc. DOnt know the exact size

[Dave400ex]

I thought for a 440 stroker you bored it over to a 416 and then they stroked it to a 440? I know that's what TMM does but not sure about anybody else.

[Extremeracer167]

It just depends on what mm crank u get. I think the TC crank is a 6mm. And stock bore with the crank is 440

either way you do it you will need a new piston an the crank stroked. Most builders will not build a stroker with a stock rod so you will need a rod too. and if you only stroke it 4mm you will need to bore the cylender .80 over

[Sparks425Ex]

Originally posted by WarriorMan
I thought for a 440 stroker you bored it over to a 416 and then they stroked it to a 440? I know that's what TMM does but not sure about anybody else.

I don't think anyone strokes to a 440 on stoke rod. You are right.

[badA$$440EX]

what does it cost to have all of this done ... to have all of this done... could you tell me individual cost like.. piston ... crank .. labor...etc...

[mikeboone]

Every time I see a post like this someone says "and you have to buy a new crank..." The crank in your quad is stroked itself; you DO NOT buy a new one. I would go with Carillo when replacing stock connecting rod.

[mikeboone]

Here is what you get with these combos::: stock 85 mm piston and 4mm stroke=420cc ---- 85 mm with 6mm stroke=431cc******(416 bore) 87mm piston and 4mm stroke=440cc---87 piston and 6mm stroke=452cc

www.powroll.com

they have a kit that uses a new rod, crank, and piston kit thats made to work together.
then for 500 the have a modified stock crank with a heavy duty rod and uses a normal 416 piston unlike the kit above.

[badA$$440EX]

if the 85 mm with a 6mm stroke would be 431 ... then what would an 85mm with a 7 mm stroke be ? or is this an option ?

[badA$$440EX]

well I aint really sure yet but i think im gonna go with mx#132's suggestion ... the 87mm (416cc) bore with a 4mm stroke ... sounds like one of the best to me .. thanks for the help guys

thats what i'll be doing soon:D

[BadA$$440]

Call up some of the engine builders and talk with them to find out what you want. I would say bore it to a 416 then stroke it to 440 would be your best bet ( i might even do this someday). Im not sure about prices, but if your able to do most of the work yourself then it would be ALOT cheaper.

[badA$$440EX]

I think i could do most of the work my self im not sure what all needs to be done ... i mean what machine work .. or perfection ( percision) grinding or and thing.. everything should just go back together after its bored right ? or am i wrong ?

[Bean]

boring to a 416 or 425, and stroking to 440 would be your best bet, more sleave left for heat transfer, and better revvin cause of smaller piston, and saying you have a stroker motor makes it sound more hardcore

[2 QuicK]

What would u say the reliabilty is of a 416 bore stroked to a 440....I know it's better then just a straight bore to a 440. But would it be the same as a 416's reliabilty or more like in between that and a 440..?

i would think due to increased crank angle from the crank it may need rebuilt more often but i am not sure on that. i would say it's more relible than a 425 bore though

[Dave400ex]

Yeah I think the 416 bore and stroke to a 440 is the way to go. That or 425 bore and stroke to a 465.

[TrX465]

im doing a 4mm stoker with my 92mm piston.... its so funny i i have some much compression i blew 2 of the head studds out i thought it was kind of cool myself....we had it fixed...