[engine mods] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

Pages:1

engine mods
(Click here to view the original thread with full colors/images)

Posted by: the fat kid

ok so im looking at motor parts and theyre pretty cheap for the most part so lets just say i got an athaena 430 kit valves and hot cams both sides am i lookin at a pretty big jump in hp? and is it reccomended to get that kind of work done or just do it with a manual?? im just asking cause a dude that works at a local shop says that he added stage 1 hot cams to his lt400 and it made it slower than his wifes stock lt400

Posted by: drnez

Add DRZe valve springs to that list for reliability. You'll also need a carb to feed that beast. I assume you already have a full exhaust and high flow filter? You can expect to see around 60-70% gain over stock!

Posted by: ltzee

hey you might check out lukes racing, they have the athena kit along with several other kits to choose from that will give you some BIG gains!

Posted by: drnez

quote:
Originally posted by ltzee
hey you might check out lukes racing, they have the athena kit along with several other kits to choose from that will give you some BIG gains!

Lukes sells a replated stock cylinder bored to 94mm. Its not exactly the athena and does not have the larger water jacket. Not saying that its anything bad! I'm sure its still a hell of a kit.

Posted by: the fat kid

wow seventy percent huh? yeah i have a pro flow and k&n stage two slip on but im planning on sellin that and getting a yoshi rs3 full system, is htere a market for used parts like that like my dg nerfs and slip on pipe?

Posted by: jherbie28

i went with the wiseco 440 sleeve kit also have hotcams(inandout) 12 1/2:1 high compression piston, did heavy duty cam chain, barrnett heavy duty clutch and basket, race fuel. runs great no problem with the 450's haaaaaaaaaaaaa

good luck brother
also does the carb make that much of a difference?

Posted by: wild kfx

quote:
Originally posted by jherbie28
i went with the wiseco 440 sleeve kit also have hotcams(inandout) 12 1/2:1 high compression piston, did heavy duty cam chain, barrnett heavy duty clutch and basket, race fuel. runs great no problem with the 450's haaaaaaaaaaaaa

good luck brother
also does the carb make that much of a difference?

cARB HELPS BIG with my friends 400

so can you beat a 450 with a 440 withy everything done to it?

Posted by: jherbie28

yeah man, pull away like nobodys business

Posted by: soberagain150

i got the wiseco 440 kit as well... love it

Posted by: the fat kid

well now im kinda confused the guy at my shop that owns an 04 and an 03 lt400 says his with cams exhaust and intake, 13 tooth front, k&n, full exhaust and all is slower than his wifes stock that just doesnt sound right...

Posted by: jherbie28

does his lose in the over all, meaning that does his loose when they race wound out 5th gear? or does his loose on the take off?

the gearing is a huge factor! i run 14front 41 rear from sidewinder, they told me with the motor work and the tire size that is the right combo $400 later also with a chain and 6 cans of lube.

Posted by: Defiant1585

i have the same set up 440 with hot cams, dont get me wrong its quick but to much work than its worth my oppi9nion just leave it stock my buddy has one 2 days older than mine and he has never had a problem with his. in my oppinion dont go into the engine re-gear it and put tires on it leave it alone in my oppinion

Posted by: jherbie28

it was worth it to me man, the bike pulls hard! real hard

tires, motor work, gearing, and good looks the whole 9yards.

Posted by: drnez

quote:
Originally posted by Defiant1585
i have the same set up 440 with hot cams, dont get me wrong its quick but to much work than its worth my oppi9nion just leave it stock my buddy has one 2 days older than mine and he has never had a problem with his. in my oppinion dont go into the engine re-gear it and put tires on it leave it alone in my oppinion

I built my 434 in a weekend, for a 70% increase in HP over stock? I'd say thats worth it. The thing has been rock solid once I got the stock valves out of there.