big bore kits

[quad_man08]

when i get some money id like to get a 440 kit with a hot cam, maybe a rev box, but im wonderin if you gotta change all the jets and stuff or if theres anything else that you have to put in it also and if 12.5:1 or 11:1 is better

[underpowered]

if you go big bore you have to re-jet.

for a 440 you may need HD head studs. for the comp. ratio with the 11:1 you can run pump gas, but with the 12.5:1 you need to run race fuel. it is up to you on whether you want o go with race gas or not.

[sickmojave]

Originally posted by quad_man08
when i get some money id like to get a 440 kit


is there any particular reason you are going with the 440??

[Myrtle150]

440's are a pain

[BlackTrx440ex]

not tru... i put a 440 in mine 4 months ago and it is running perfect not one problem

[ZSK]

Give it time.

[FoxRacing81]

426 or 416 is the way to go IMO...

[quad_man08]

ok, thanx everyone.....where can I get hd studs and now that someone says 426's and 415's are better are they? cause one of my friends just put a 415 in his and he says its faster than the 440(which i dont believe) so im just wonderin

[CHEVYZ]

What makes the biggest difference is how you put your overall package together. A properly worked 416 could be LETHAL. Just walk all over the 440. Same with the 426, and the 440 to the others.... etc. I chose the 440 for the torque I hear it puts out. I will be installing it soon along with my other stuff.......

[xc_racer1]

416 and 426 are way more reliable but the 440 will deff. walk all over them... if u want bottom end then go with the 440 big bore but if u want mid range and top end go with the 440 stroker.. the stroker will walk all over all of them.

it all depends on if u have the right person to do them

if u go 11:1 u can run pump gas but run 93 or else u wont get the power u should outta ur motor

12:1 u can run half and half
i recomend to use just race gas but if ur cheap like me and have no money run half and half
but any higher than 12:1 u have to run it straight
and yes the jets are diff. when u bore ur motor

[FoxRacing81]

Umm...no, 440s will not walk all over them.

416s and 426s rev much much faster then 440. That's why 440s are good for torque, but don't have that instant punch to em. They may feel powerful, but 426 and 416 definatly a lot snappier and take off quicker. 440s you can lug around in one gear all day with the torque, but when you wanna take off, ain't gonna happen as fast as a 426 or 416. You're right about one thing though, 426 and 416 are a lot more reliable.

-Justin

[quad_man08]

ok, now that i know that 426's get more acceleration ill probly go with that.....is there a place online where you can get the whole big bore kit with sleeve and pistons and a hotcam? only place that ive saw them is on ebay, or where can you get a 440 with a stroker and how much is that? thanx

[FoxRacing81]

Originally posted by quad_man08
ok, now that i know that 426's get more acceleration ill probly go with that.....is there a place online where you can get the whole big bore kit with sleeve and pistons and a hotcam? only place that ive saw them is on ebay, or where can you get a 440 with a stroker and how much is that? thanx

Call up C&D Racing. The sponsor of this site. They will hook you up. Actually, I just recieved parts I ordered from them today, and it is where I bought my 426 kit from.

-Justin

[ZSK]

Wow this thread is a boatload of bad information.:rolleyes:

[JOEX]

Originally posted by ZSK
Wow this thread is a boatload of bad information.:rolleyes:
Would that be a bored 440 or a stroked 440?:eek: :chinese:

[QuadJunkies]

Originally posted by ZSK
Give it time.

LikeIve always said... If its done right it can last just as long as a stock or other big bores.
its all in how you maintain it , what kit you intall ,and the person installing it :p

Ive past my 1st year mark and I still am problem free :) heck I even only had to Re-ring my piston!!

I have has a 426 before and had no issues other than it ran hotter . I did like it as well

But I LOVE my 440 over my 426. I still keep it for a back up if ever need be but my 440 runs cooler than my 426 did and I got more power threw out compared to what I had before.
If you can afford to get a Duncans PC4000 I HIGHLY reccomend.

[QuadJunkies]

My 440 is also just as fast of the line as my 426 was. I added a 450R carb to my 440 and I feel they work well together

[CHEVYZ]

Wow, quadjunkies, you rock! It was helpful..... hehe, mostly to me. I have a 450r carb coming from a guy over here to go with my 440 as well. I was actually recommended it, as a guy that I met had tried the 450r carb and for the price, said it worked as well as some more expensive products, so I wanted to try it. With your results, it is making me quite happy I got it. I will also couple mine with other work... the 440 kit of course (12:1), port and polish with the 3 angle valve job ( The works......), a stage 2 hotcam, Big Gun rev box, FMF powercore 4 and powerbomb exhaust, K&N airfilter, jetted, possibly a 16T sprocket. Ummm, what am I forgetting? Anyways, most of it will be going on when I do the work.. so I am looking to see a big improvement ( Fingers crossed).

[QuadJunkies]

Originally posted by CHEVYZ
Wow, quadjunkies, you rock! It was helpful..... hehe, mostly to me. I have a 450r carb coming from a guy over here to go with my 440 as well. I was actually recommended it, as a guy that I met had tried the 450r carb and for the price, said it worked as well as some more expensive products, so I wanted to try it. With your results, it is making me quite happy I got it. I will also couple mine with other work... the 440 kit of course (12:1), port and polish with the 3 angle valve job ( The works......), a stage 2 hotcam, Big Gun rev box, FMF powercore 4 and powerbomb exhaust, K&N airfilter, jetted, possibly a 16T sprocket. Ummm, what am I forgetting? Anyways, most of it will be going on when I do the work.. so I am looking to see a big improvement ( Fingers crossed).

whos cylinder??? congrats!! you will LOVE the 450r carb -I can promise you that!! Expect close to a 4 HP gain if properly Jetted. Yes- the price is too good to pass up and the gains arenot that much dif. on an aftermarket one Im told. . I am now running a JE how about you?? I have also ran Ross before on my 426 with good results.

[QuadJunkies]

Originally posted by CHEVYZ
Ummm, what am I forgetting?

If ya got some good suspention your off to a darn good start!! :blah:
Are you doing all the work?(well, maybe not the P&P) Itsnot that hard to do just take your time and do EXACTLY to spec.;)

[ZSK]

Originally posted by JOEX
Would that be a bored 440 or a stroked 440?:eek: :chinese:

Mine was bored. It was built by a reputable shop and ran flawlessly for a total of 3 months. Blew a headgasket and then all hell broke loose. I changed the oil frequently, and ran amsoil when it became the 440. After one headgasket I put FDO's HD studs and replaced the gasket with cometic 3 layer. It ran good for about a month and chewed up the cam chain supposedally an HD chain. I replaced it with a CRF450 chain and put in a Hotcam. It ran good for another month and then the valves tagged the piston. This time it took the brank bearings, and 3 transmission gears. At this point I cut the losses and put it back to stock and bought a YFZ. :devil:

More than likely starting with a full Duncan or Sparks built motor will help with reliability. I put less than a year on the 440 and didn't get the performance or reliabily that was claimed. For me a big bore is out of the question. Bore an engine that needs it or buy an already faster quad. The YFZ is faster stock, than my 440 could have even dreamed about.

I said that this thread was a boatload of bad information because of the 416 vs 426 vs 440 talk. When built for your application the 440 will be the fastest. Compression, portwork, exhaust, the cam, carb and intake are all factors in how an engine will run. Send it to an engine builder and have them go through it. When you buy the "Kits" you will have the headaches and be disappointed in performance you get.

I'm happier on my YFZ then I ever was on the 440. Put a pipe and filter and it's faster, gets better fuel mileage and is much more reliable, all on pump gas.

[QuadJunkies]

Ous was not a full Duncan built quad .We done most of the work ourself other than the P&P . My Cylinder is custom from Duncan so the gasket issue is not an issue with the PC4000. It costs a little more but it makes it worthwhile if its full proof IMO ;)
A freined of mine gave us another 440 kit we tried to run on here once before the one I have now and it blew a head gasket rightoff the bat.. Again I think alot had to do with who make the kit and who does the work. I no doubt have a FABULOUS kit . I dont do rally anything speacial besides a little more routine maint. and I run good ole honda oil and always have. MY only compaint with built motors is they are def harder on a Tranny . I gave mine a FULL rebuild this winter .I lost nuetral .. lol

sorry to here of your problems :( that sucks

[ZSK]

Why be sorry? This is what I ride now.:D

[QuadJunkies]

I feel my Honda will outlive that Yami... Sorry.
Each to there own. If your happy then thats all that matters ! :)

[QuadJunkies]

How do you like that pipe?

[reichart90]

QuadJunkies,
i have an '01 with a 416 kit in it, that was already installed prior to me buying the quad. all the work was done by a very reputable engine builder in our area. he does all the work on almost all the quads at the local track and all the high performance gokarts in the area. anyway...
... this past weekend while riding, the engine shut off after making a horrible horrible noise in the bottom end (atleast thats what im guess). sounds like someone dropped a bunch of tools on the ground.. all the clinging and clanging when i hit the START button. one of the guys there said maybe a rod went. he was gonna take the engine out this week and check it out for me to see what all happened (the guy knows his stuff). i'm thinkin this will be a good time to do a 440 kit. i THINK its a stage2 cam already installed. i will know by the weekend. i have the smaller edelbrock carb (not the eichner series). could u send me the websites where i can look at pricing on my best setup of stuff for the 440 kit. this way i can get a good feel this weekend when talking to the engine builder... and i wont sound like a complete jack@ss. also do u think i should ditch the edelbrock carb and use a 450r carb?? thanks for ur help. oh yeah and the rest of my mods are in my sig
-tim
<img src="http://i35.photobucket.com/albums/d170/reichart90/MyShiz/19-Photo19.jpg" alt="Image hosted by Photobucket.com">

[ZSK]

Originally posted by QuadJunkies
How do you like that pipe?


Love it. It quieter than if you pull the butt plug out of the stock pipe and makes the power I needed.

[CHEVYZ]

Originally posted by QuadJunkies
whos cylinder??? congrats!! you will LOVE the 450r carb -I can promise you that!! Expect close to a 4 HP gain if properly Jetted. Yes- the price is too good to pass up and the gains arenot that much dif. on an aftermarket one Im told. . I am now running a JE how about you?? I have also ran Ross before on my 426 with good results. That is great to hear! I actually got the cylinder off of ebay, so now I will have two.... one 440, and one for if I ever want to and/or need to change.:D The piston is Wiseco. I have heard various Wiseco vs. JE comments, blah blah... I just went with the Wiseco because the only JE I could find was like 88.5 mm compared to 89 ( Wiseco)? I wasn't sure, so I figured that I was safe with Wiseco, and went with it. Used them, liked them, heard respectable comments, hope I don't have any worries!:p All of the work will be done by me. I love tinkering LOL. I am trying to scrounge up whatever I can for the suspension now actually. I just spent everything I had laid out to put in my bike into my engine.... so I guess it will just take a little time. Do you have any suggestions as to a good, BUDGET type set-up ( LOL, can't afford Elkas ;) )? I heard the 450r shocks work decently, so I was hoping I could find some pre-set-up for the 400 on ebay or somewhere like on here in really good condition. I have seen them going before. Arms and what not, no clue. I haven't narrowed it down yet anyways, as you can see. Hopefully I won't have to spend forever to get some extra money on the side for it ( I am hoping right after the build).

BTW, is there anything else necessary or that I may want to change when I am doing the work? I have no worries, I honestly treat my bikes very well... so, I would think that I would not have any problems on my part. Just anything that may be a weak link in my engine with the work. Also.... I think I forgot, I am not doing the P&P. Have any suggestions? I was thinking C&D sounded REALLY good for the price. I do know that you get what you pay for though... so is there anyone else for not a truckload more that is any better? Thanks... you guys are extremely helpful.

[QuadJunkies]

Originally posted by reichart90
QuadJunkies,
i have an '01 with a 416 kit in it, that was already installed prior to me buying the quad. all the work was done by a very reputable engine builder in our area. he does all the work on almost all the quads at the local track and all the high performance gokarts in the area. anyway...
... this past weekend while riding, the engine shut off after making a horrible horrible noise in the bottom end (atleast thats what im guess). sounds like someone dropped a bunch of tools on the ground.. all the clinging and clanging when i hit the START button. one of the guys there said maybe a rod went. he was gonna take the engine out this week and check it out for me to see what all happened (the guy knows his stuff). i'm thinkin this will be a good time to do a 440 kit. i THINK its a stage2 cam already installed. i will know by the weekend. i have the smaller edelbrock carb (not the eichner series). could u send me the websites where i can look at pricing on my best setup of stuff for the 440 kit. this way i can get a good feel this weekend when talking to the engine builder... and i wont sound like a complete jack@ss. also do u think i should ditch the edelbrock carb and use a 450r carb?? thanks for ur help. oh yeah and the rest of my mods are in my sig
-tim
<img src="http://i35.photobucket.com/albums/d170/reichart90/MyShiz/19-Photo19.jpg" alt="Image hosted by Photobucket.com">

First of all sorry to hear of the break down. let me know what ya find out what went wrong!:scary:
I would ask all your questions to Duncan Racing .Duncan has alot of know how also Sparks would be another good one to call. As far as the Edelrock its a love/hate relationship for many with that carb. I know several that could never get the Carb to work right with there quads and went other routes, and one guy that loves his .I think I would keep your Carb for right now unless you have the money to spare and would like to try something new !you can pick u pa 450r carb for a decent price most of the time .;)

Your ride is pretty sweet !

[QuadJunkies]

Originally posted by CHEVYZ
That is great to hear! I actually got the cylinder off of ebay, so now I will have two.... one 440, and one for if I ever want to and/or need to change.:D The piston is Wiseco. I have heard various Wiseco vs. JE comments, blah blah... I just went with the Wiseco because the only JE I could find was like 88.5 mm compared to 89 ( Wiseco)? I wasn't sure, so I figured that I was safe with Wiseco, and went with it. Used them, liked them, heard respectable comments, hope I don't have any worries!:p All of the work will be done by me. I love tinkering LOL. I am trying to scrounge up whatever I can for the suspension now actually. I just spent everything I had laid out to put in my bike into my engine.... so I guess it will just take a little time. Do you have any suggestions as to a good, BUDGET type set-up ( LOL, can't afford Elkas ;) )? I heard the 450r shocks work decently, so I was hoping I could find some pre-set-up for the 400 on ebay or somewhere like on here in really good condition. I have seen them going before. Arms and what not, no clue. I haven't narrowed it down yet anyways, as you can see. Hopefully I won't have to spend forever to get some extra money on the side for it ( I am hoping right after the build).

BTW, is there anything else necessary or that I may want to change when I am doing the work? I have no worries, I honestly treat my bikes very well... so, I would think that I would not have any problems on my part. Just anything that may be a weak link in my engine with the work. Also.... I think I forgot, I am not doing the P&P. Have any suggestions? I was thinking C&D sounded REALLY good for the price. I do know that you get what you pay for though... so is there anyone else for not a truckload more that is any better? Thanks... you guys are extremely helpful.

C&D would be great . I heard they do great things with shocks too so def give them a call first!! They may have some shock ideas for you:)

Keep an eye on the for sale section on a good set of used shocks that my be for your rider size/valving ect. Thre is sooooooooooooo much up for grabs for an Ex right now its crazy!
IMO I would pass on the 450r shocks and just save for something even better. I have my reasons for saying that its just my prefernce and dont think they are a real good set up IMO.
Hope that helped some ;)

Tina

[QuadJunkies]

Originally posted by ZSK
Love it. It quieter than if you pull the butt plug out of the stock pipe and makes the power I needed. theres a local here that has that pipe on His Yami too that seems to be happy with his also.

[CHEVYZ]

QuadJunkies, THANKS ALOT! Today I finally got some time to strip it down, and have already sent the head off to C&D. I am going to take your advice and pass on the 450r shocks. Anything in particular you find works well for some reasonable amount of cash? I will be on the lookout pretty soon....

[QuadJunkies]

Originally posted by CHEVYZ
QuadJunkies, THANKS ALOT! Today I finally got some time to strip it down, and have already sent the head off to C&D. I am going to take your advice and pass on the 450r shocks. Anything in particular you find works well for some reasonable amount of cash? I will be on the lookout pretty soon.... Ive had Works shocks before my Elkas but I have to say.. My Elkas are far more superior than my works ever was.Ive rode some quads with TCS and they worked nicely as well.You shouldbe able to find a good deal on TCS shocks,maybe post in the wanted section when your ready to buy and see if you cant find some TCS. :)

[CHEVYZ]

OK, great. My piston came in yesterday, so I installed all of that part of the engine. Come to find out I will be running a 12.5:1 piston, as that is what they shipped me instead of 12:1. I was kind of happy though. Can't wait untill I get everything!:D

[QuadJunkies]

Originally posted by CHEVYZ
OK, great. My piston came in yesterday, so I installed all of that part of the engine. Come to find out I will be running a 12.5:1 piston, as that is what they shipped me instead of 12:1. I was kind of happy though. Can't wait untill I get everything!:D 12:5:1 is very standard actually, thats what I have (and we had in our Predator) most people wouldnt even know the difference in the piston Ive been told

some people refer there 12:5 to there actual 12:1 too ;)

[CHEVYZ]

Ah, I see. I really didn't think it mattered but I figured the more the better. I am waiting on my throttle cable though. I asked them to ship it in the same package... and they agreed, but well, I guess they forgot. It is OK, my carb isn't here anyways, and my head won't be back for at least about a month I am guessing.

[bayou boy]

CHEVYZ are you josh?

[CHEVYZ]

No, sorry. I do know ALOT of Josh's from all around though..... anything in particular that I may reconize him by?

[bayou boy]

just wondering...I met a guy named josh at the spillway and he had talked to us about the 450 carb I put on my friends 400. thought it may have been you.