Advantages of Stroking?

[NacsMXer]

Im kinda new to stroking here. I having a heavy duty rod put on my 440 and Im wondering if stroking is worth it. First and most importantly, does this compromise any reliability of the motor? How would the powerbands of a standard stroke 440 differ from a 416 bore stroked to a 440?(Assuming both have fully built valve trains for MX) Thanks a lot, im trying to figure out if this is worth it or not.

[nuttynewt]

huh, huh huh... you said stroking...

[44oEX]

the biggest diff. is torque.

With stroking it you are definatly going to gain torque! you will have more power right off the bottom end. you will not have to shift near as much and you will not want to rev the motor out as much. ride in a higher gear. also the power should be smother. as far as reliability goes as long as you have a heavy duty rod, stroking it will not hurt the reliability as much as boring it. but you are going to hurt the reliability ANY time you add horse power. How it will compare to a 440 bore, basicly you are going to have about the same HP. it will just feel alot more powerfull. in my opinion a stroked motor is easier to ride and doesn't wear you out as much!

[Doibugu2]

GNNCer, did you have like a 465 stroker or something?

Has anyone stroked a 416? Doesn't hat make it a 440 or something?

[kickin440]

I have a stroker that I have ran as a 460 and as a 440 both.
And I would say for mx you would deff. be happy with the 440 stroker I run mine with an fcr 39 and it runs awsome. and I don't even have that much done to the head I ported it and put a cam in it and thats it If you have a proffesionally done head it should really rip!!

[44oEX]

if you want some real power get the FST 500

[NacsMXer]

AMA MX bike here: 440s the limit for me. Thanks for the replies.....basically what I had thought. Stroking = Slower Rev, More Torque off the bottom. Standard 440 = Higher Faster Rev, more HP as RPMs build. So considering this is gonna be a pretty mean MX bike and not a CC racer, I dont think I should stroke my motor because Low end torque isnt the biggest priority in MX. Thanks again for all the info.

[UglyMotha™]

Originally posted by Doibugu2
GNNCer, did you have like a 465 stroker or something?

Has anyone stroked a 416? Doesn't hat make it a 440 or something?



next winter baby :p

[INFANTRY RACING]

gig bore 440's suck.. get the stroker. 4 mm storke isn't huge so it should still rev. my stroker crank just go don today and i should have it next week sometime

if you want some real power get the FST 500

if you want a big expensive motor that cost a ton that is good idea.

If you want a motor with REAL power talk to FDO they have some of the most powerfull motors out there.

I have a 463 stroker. you can get them in all different sizes. mine is 88mm bore witch is the same as a 425 and stroked 6mm to make it a 463. FDO is getting right at 50 horses out a 440 bore right now. I don't think anyone is getting more than that out of a 440 stroker.

just some info. LRD 460 stroker is a 89mm bore/440 bore with 4mm stroke
FDO 493 is a 91 mm piston with 6mm stroke
FDO and TC 463?465 is 88 mm piston with 6mm stroke
Fisher and outhers 440 strokers is a 416 bore with a 4 mm stroke

[NacsMXer]

Thanks man for the nice info. I have to stay at 440cm3 so I cant do a 463 or anything like that. I just shipped my motor off to GT Thunder last week so the work should be good. Do you think one of his 416bore 440 strokers would be good for A-Class MX racing or should I just stick with the standard bore fully built 440. Im just tryin to make a decision on the details of the motor before I talk to Laz at GTT. Thanks again for the help.

[TheChknhwk]

Did FDO ever put up a website?

Nacs
My personal thoughts are that you don't need to stroke a 440. the gains are minimal compared to a fully built 440 bore. again just my opinion. why do you have to stay are 440 I thought all limits were bumped up to 450 now?

Chickn dude:
Three weeks ago somone was supposed to meet with them about building them a site. what has happened with that I have no Idea. I havn't been hanging around there much recently.

[K_Fulk]

Originally posted by GNCCer
Nacs
My personal thoughts are that you don't need to stroke a 440. the gains are minimal compared to a fully built 440 bore. again just my opinion. why do you have to stay are 440 I thought all limits were bumped up to 450 now?



Thats what I was gonna say.

You can go to a 450 bore/stroke combo with a 88mm piston and the 4mm stroke

[NacsMXer]

Hmm. may just have to think about that. I wasnt aware of the change in the AMA rules. Could be a definite option for me. Thanks for the info.

You can go to a 450 bore/stroke combo with a 88mm piston and the 4mm stroke

I was wondering that. 88mm with a 4mm stroke actually puts you just a touch over 450. but it is close enough I didn't think anyone would say anything about it. I that the combo everyone is going with for 450s?

[K_Fulk]

Yeah its just a hair over like .00521. I doubt they would say anything about it.