how should i start out my rebuild ? give me opionis on wut 2 get done

[speedfoxracing]

my 4wheeler smokes a good amount and is a stock bore so i,m goin 2 a 406 with 10:1 comp and i,ll get a timing key prob stage 1 cam. is there anythin else u recomend doing i have exhaust and its jeted. and i,m just tryin 2 get the most power out of it and i dont have 2 much money 2 work with so give me some ideas thanks

[rideracelivemx7]

ehh youve basically have all the bolt on upgrades. everything else is pretty much engine work from there. 406 kit? i dont htink youll feel much from that. id say atleast 416 kit and its not that much more.

[speedfoxracing]

i,m not getting a kit i,m taking the cylinder somewhere 2 get bored and then get the piston. and the way i look at it is that the 416 will prob run hotter and not be as relible. i do mostly trail ridin and slow and my 4wheeler runs hot so idk yet wut i,ll get unless u think the 416 will be fine

[rideracelivemx7]

hte 416 kit is actually the most prefered for the reliability. your not in danger of blowing hte head gasket like the 440s. and its not a huge amount off the stock sleeve so it will still be reliable. and a kit would be a piston rings clips gaskets and wrist pin. so its a kit lol and heat deff wont be an issue. i have a 440 and ive never over heated and ive ridden close to 100 out all day and still the hog ran fine. honestly i don thitnk youll see any difference with 6cc. on a 2 stroke youd notice it but not in a 4 stroke.

[F-16Guy]

Originally posted by rideracelivemx7
ehh youve basically have all the bolt on upgrades. everything else is pretty much engine work from there. 406 kit? i dont htink youll feel much from that. id say atleast 416 kit and its not that much more.
With such a small increase in displacement, there really isn't too much power difference between a 406, 416, or 426. Where the extra power comes from is the increased compression ratio. I think going with a 406 is smart since you'll be leaving more material for a future rebuild.

I personally would go with the 11:1 piston since you get a little more power but can still get away with pump gas, but a 10:1 piston will still be a noticeable difference.

[speedfoxracing]

well if i get a 11:1 i cant get the timing key

[DementeD]

yes u can...its pretty much anything over 11:1 that u cant use it (timing key)

[RaginRedneck]

I'm no expert by any stretch of the imagination, but don't forget that you will be going from a stock motor that is smoking (i.e. tired) to a motor that is fresh and new. Regardless of bore, you should notice quite a difference.


-Good luck with the rebuild-

[UNBROKEN]

with a 11/1 piston and CSR timming key theres a dam good change u will need need race fuel , and with the added heat maybe headstuds, 10/1 with the csr key is the saftest route to go with 93 octane