thumper racing 440ex?

[exatak199]

ok I'm looking into thumper racings 440kit for my ex. right now my has a K&N and that's about it engine wise. any way I've looked at duncan and sparks ext ext but there I little too costly for me.(I'm 13)

here are the things that I would get if I do go with the thumper 440 kit.

-Big Bore Sleeve-
-Piston kit-(rings ext)
-Valve cover Gasket-
-Base Gasket-
-Head Gasket-

oh and I want to stick with 10:5:1 so i dont have to run race gas.

but I think that I'll go with a XR400 cam instead of there cam.
and I'll do the porting myself (I've done 3 rebilds already but not on the ex)

does any one has there 440 kit?
any problems?

all so for a pipe I was thinking of going with a fmf powerbong header and a pro circuit T4 Silencer or should I just go with a fmf Ti4??witch one is bedder??


thanks:D

[K_Fulk]

No problems with mine.

Want to buy it.

[exatak199]

no problems with what?:confused: and how much?

[exatak199]

bump

[K_Fulk]

I havent had any problems with m 440

Mods include Weisco 11:1 piston, new hot cam Stage 2, port job, stainless valves, shorter valve guides, stiffer valve springs with titanium retainers, stiffer clutch springs. Can also include a bored stock carb.
I would like to get $1200. If you did it this way you could keep yours for a extra motor or sell it.

[exatak199]

hummm 11:1 is too high for me how many hours on it?
$1200 is a good deal but shiping and the canadina dollaris what would make ir hard.
thanks for the offer tho:)
what pipe did you use?

any one else?

[K_Fulk]

I used a dmc then switched to the sparks x-6 this year. Hour wise I have no idea on the whole motor. Piston was new maybe 20 hours on it, cam is brand new. I have been able to run pump gas just fine but usually run a mix. I think the weiscos are lower on compression then advertised.

[exatak199]

wellI think I'll bild my own tho.
good luck selling it hope it goes soon!

[sparks400]

exatak u can run 11:1 w/o race gas just run ur highest pump gas ya'll got up there, that what im doin i might put a lil octane booster in there, to pull up the octane, and clean out there motor.

[cals400ex]

be careful with the octane boosters. you will be fine if you run a wiseco 11:1 with premium fuel more than likely. why do you automatically want a 440?? did you ever consider a 406 or 416?

[hondaexryda]

hey for exhaust go with Pro Circuit T-4 , im 14, and t-4 is fast and sounds nice, soon im getting headpipe too...

[jshtex]

Thumper did the machine work on our 416 (bore, file fit the rings etc.) they also did our head work. They do good work and they have a lot of experience.

[exatak199]

Originally posted by cals400ex
be careful with the octane boosters. you will be fine if you run a wiseco 11:1 with premium fuel more than likely. why do you automatically want a 440?? did you ever consider a 406 or 416?

I whant a 440 b/c I whant more bottom end and I dont whant to go to high of a bore(465 500 ext). From whant I've herd from guys with 440s I think that wut I'm gunna go with and the highest octane gas I've seen around here is 94 (small town) I could probly go with 11:1 but I think that I'm gunna go with 10:5:1 with a XR 400 cam and some porting that I'll get done by the local machine shop. At fist I was thinking of going with a sparks pipe but there a little to costly$$$.
should I wait a while longer and go with a sparks of just fmf or pro circuit pipe??:blah:

[cals400ex]

well the sparks x-6 is a top end pipe. i am running 10.8 compression piston with thinner gaskets just fine on pump gas. personally i don't think you will gain too much bottom end power with a simple 440 build over a 416 for example. the key is going to be the compression ratio. i am just wondering for the extra cost of the sleeve and getting it installed, will it be worth it. i personally would go smaller on the bore and put a low end sprocket on if you want more down low. its mainly personal preferance though.

[exatak199]

well from what ive herd 416s make most of there power at high rpms.
I know that the sparks pipe is more of a top end pipe but what pipe does give bottom end?? do you think I should go with 416/426 insted of 440? I'm just trying to get the best bang for my buck ( yes I have more than a buck)

around here there are lots of Z/kfx and they think that EXs are POS's so I dont whant to just beat them I want wast them good so they shut there mouff:devil: and my ex is gett'n due for a rebild

[cals400ex]

Originally posted by exatak199
well from what ive herd 416s make most of there power at high rpms.
I know that the sparks pipe is more of a top end pipe but what pipe does give bottom end?? do you think I should go with 416/426 insted of 440? I'm just trying to get the best bang for my buck ( yes I have more than a buck)

around here there are lots of Z/kfx and they think that EXs are POS's so I dont whant to just beat them I want wast them good so they shut there mouff:devil: and my ex is gett'n due for a rebild


are you racing on a tight track, open track, drag racing (if so, how far).

i personally think the 440 is just going to give you a little bit more power than a 416. it should be alittle better on the bottom end. i know the sparks x-4 is made for low to midrange power, but i would get the x-6. the x-6 will flow a lot better with not quite as much down low, but more from mid to top. i have the x-6 on my 406. i would just call C&D and tell them your situation. tell them what you want to beat. i don't know how many mods these z's and kfx's have on them, but if they are stock you won't have a problem. i am running a simple 10.8:1 ross piston in a 406, stage 2 hotcam, x-6, with jets and i will beat a piped z/kfx. however, it does want to rev high. for the power to be best, keep the rpms high. with the stock rev box i don't beat them as bad. with an aftermarket box, the piped ones i raced don't have a chance. there are many people running 440's with great success. maybe i am just to stringent and want a small bore. i like the idea that the small bores create less heat. that is important for myself because i don't want to run race gas. i can tell you that the compression ratio is going to be more important than the bore size in my opinion. just call colby at C&D and tell him what you need. he is a great guy and they have some of the best prices around. good luck

[exatak199]

I ride mostly open trails and I have a gravel pit behind my house and my friends have there own privite mx tracks both are fast 4-5 gear mostly but i do ride tight trails and i dont whant to be working the clutch all the time so it dont stall.
and I do som drags just with my friends just for fum.

I whant a good fast engine that still is cheap so I have more $$ for shocks and a-arms tires ext.
and wit the dollar differance things cost more for mee:blah:

[cals400ex]

the 440 will definately cost more because you will be buying a new sleeve and getting it installed and bored. call C&D, they will give you some suggestions.

[440C12]

[QUOTE]Originally posted by K_Fulk
No problems with mine.

Want to buy it. [/QUOTE



Hey K_Fulk want to sell your X6 Pipe?

[K_Fulk]

Originally posted by 440C12
[QUOTE]Originally posted by K_Fulk
No problems with mine.

Want to buy it. [/QUOTE



Hey K_Fulk want to sell your X6 Pipe?

No just that motor.

Originally posted by exatak199
I'm 13

and I'll do the porting myself




:eek2: :eek2:

[xc400ex]

I think you'd be really happy with a 416 JE piston 10.8:1 with stock gaskets. That would run on pump gas. You could also buy an xr400 cam or hotcams stage 1 along with the 416 piston and still be below the cost of just the 440 bore. Oh yeah do not do any head porting leave your head just like it is for maximum performance :cool:

[cals400ex]

i am with rico on this one. i say leave the porting to the pro's. horsepower can be lost really quick with porting the wrong places.

[440C12]

Originally posted by 440C12
[QUOTE]Originally posted by K_Fulk
No problems with mine.

Want to buy it. [/QUOTE



Hey K_Fulk want to sell your X6 Pipe?

I'm looking for a used X6. Heard good stuff about it. My Yoshimura setup is too restrictive for my 465 setup.

[K_Fulk]

i got mine out of the wanted forum here on exriders give it a try someone might have one they want to sell. Also look into hetricks and gt thunders pipes. The hetrick is very simialr to the sparks and GtThunders is also good for modified motors.