rebuild to 416ex

[UNBROKEN]

hey guys im gettin my topend done i think ill be going to a 416 wondering how reliable this is im wondering if i should go with the high comprssion 11to1 piston , i trail ride and dont want overheating are head studs required and were did u guys get all ure parts from im looking to keep this rebuild as cheap as possible, and is rejetting required , thanks ryan

[drew416ex]

a 416 is very reliable and you shouldnt have problems over heating with 11:1. You can get the parts anywhere for roughly the same price, maybe within 10-15 dollar difference. You will have to rejet but that will depend on other mods you may have and where you live.

[morse250r]

my buddy did a 416 high comp for his wife put a stage 2 cam 450r carb and a 450 can with the hrc end cap she doesnt like loud exhausts the thing runs great and it was done cheap he ran it at a local dirt drag and was getting 440 kits

[UNBROKEN]

well im getting my liecse so im tight on money so i wont be getting a 450r carb, i already have a procircut slipon, i was just wondering if the stock rod could handle the bigger piston and high compression,

[morse250r]

yes youll be fine keep an eye out you can get a 450 carb for under 75.00 look on trx450r.org good luck

[400ex28]

Get a 416 kit 11.1 comp, stage 2 cam and u will be set, you will feel a difference for not much money.

[TRXRacer1]

11:1 is fine but I went 10:1 because I'm not afraid to get mine mudded up and mud doesn't exactly cool an engine down if you know what I mean. Either way you will be fine with the stock studs and rod. If all you want to do is a budget top end job and everything looks good you can easily do this for $200. Toss in a little extra if you can and get a stg 1 hotcam, they have great all around power delivery. As far as jetting it should always be checked.

[UNBROKEN]

TRX racer do u think that will be a problem the 11/1 piston cuz i do alot of ridong in mud tight technical trails and again i dont realy have the money for a cam so the stocker is stayin , i guess it will have alot more lowend torgue and run alittle flat on top but wut i do it wont be bad at all

Originally posted by morse250r
yes youll be fine keep an eye out you can get a 450 carb for under 75.00 look on trx450r.org good luck

I know a guy that was selling 1 for $50 but I didnt have the cash nor time to put it on so I had to pass :( Evn if I bought it I could have sold it for more. And why are people on this site so expensive most of the time. They think their 450r stuff is gold and people are buying it. I see oter sites 450r shocks average $100 and 450r carbs are anywhere from $50-$100

[TRXRacer1]

Originally posted by UNBROKEN
TRX racer do u think that will be a problem the 11/1 piston cuz i do alot of ridong in mud tight technical trails and again i dont realy have the money for a cam so the stocker is stayin , i guess it will have alot more lowend torgue and run alittle flat on top but wut i do it wont be bad at all You should be fine. 11:1 is kind of the max you'd want to run on pump gas. I'm a heavy dude and a lot of the time when I ride I could be out for hours with a coated or sometimes caked engine. Add that caked engine plus the added weight my 400 carries and I have a hotter then normal engine. The 11:1 was just not a smart choice for me. I have zero regrets though because the 10:1 is a nice little bump from stock and I do have the stg1 cam too. The question is what is going to work for you. More compression will yield more power. If you're an average rider that won't be riding extended periods with a mud coated engine then go with the 11:1. If you're like me and tend to ride trails that only 4x4's run then you might want to go with 10:1. I could have still gone with the 11:1 with my riding style but I would have needed race fuel or at least a blend.

[UNBROKEN]

yeah i think ill go with the 11/1 im only 140 pounds , if i go mudding and dont want to get stuck ill take my ttr230 i sometoes take my 4 wheeler or dirtbike out in the bay by my house , but if the 11/1 detonates ill hear it and run octane booster when i plan on muddin

[morse250r]

in the 4 sale section theres a 450 carb 75 shipped or best offer great upgrade cheap

[UNBROKEN]

i saw that 450r carb i was drooling at that price but now is a tough time im 16, unemployed for another month and getting licsese so i need insurence and gas money , ALSO i having doughts how many people run the 416 with the 11/1 cuz i read back on a old thread that i should install headstuds, if this is the case i will go 10/1

[UNBROKEN]

well i gave it alot of thought and endded up going with a 406 and a stage 1 hotcam with 10.5 piston. the valves are getting recut and the whole head is getting rebuild labor is going to be 250 dollars, parts i think was 450 bucks and the machine shop to work the head and bore was 140 bucks, and i still have a bent rim thats epoxied and 4 worn tires and old chain to say the least this is going to be one expensive 4 wheeler that im not going to get my money out OWELL, but with the 406 and the hotcams will my increase be noticable ? will i lose any lowend,

no the hotcam gives you power all around really. 406cc isnt didily-squat and you probally wont notice the extra ccs much but there will be a gain. The piston and hotcam will give you a pretty good gain though. either way a 406 with a hotcam and different piston will be faster than a 397 with a hotcam and different piston.

[UNBROKEN]

i got one last ? wuts the max u can bore a stock cylender to without resleeving, is it a 426

[UNBROKEN]

the reason i say this because the dude that buiding my motor is saying his boring it 30 over and he said it be at least a 420 or over , now 2 and 2 arent making sence so wut do u think of this guys

[hornetgod13]

Your mechanic sounds a little shakey if you ask me. Do you now what he mean by 30 over?
Did you give him the new piston before he did the bore? He needs it to do it correctly.
Once you get to a 440 you need a new sleeve.

[TRXRacer1]

Originally posted by hornetgod13
Your mechanic sounds a little shakey if you ask me. Do you now what he mean by 30 over?
Did you give him the new piston before he did the bore? He needs it to do it correctly.
Once you get to a 440 you need a new sleeve. X2, make sure he has a piston in hand before he does any boring!

[UNBROKEN]

well wut is 30 over would that make it a 406

[Brauap]

Just an off topic question, what is the stock compression? is .5 or 1.0 a noticible difference?

I am thinknig of a rebuild, to a 416, and I was also think os 11:1, stage 2 hot cam, and port in polish. But I run long and hard, and I dont want to get into mixing gas. Would it be fine? Also is there a big difference between 10.5 and 11:1? Why would you have to mix fuel w/ octane booster?

Thanks!

X2, I'd give him the piston first. If he bores too much, then your screwed. You'd have to get something bigger than you may want.

1 more question. What is a 416, like how many over, .40 , .50?

Thanks, again!

[drew416ex]

a 416 is .80 over. A 406 is .40 over

[UNBROKEN]

well the guy whos building my motor works at a dealership and doing this on the side he telling my dad crap cuz he always disagrees with me and my dad is making me pay the money for him to build it 30 over i guess my motor is going to have no ballz , brapp probaly knows were im coming from

[JOEX]

Originally posted by UNBROKEN
well the guy whos building my motor works at a dealership and doing this on the side he telling my dad crap cuz he always disagrees with me and my dad is making me pay the money for him to build it 30 over i guess my motor is going to have no ballz , brapp probaly knows were im coming from
'30 over' is a common over bore for automotive motors. At least from what I remember:p The overbore numbers for the 400ex and I assume other motorcycle motors are different.

The largest bore on the stock sleeve comes out to 426cc. I don't remember what the .000 number is though.


Originally posted by drew416ex
a 416 is .80 over. A 406 is .40 over
It should be .080 & .040:)

[drew416ex]

Originally posted by JOEX
'30 over' is a common over bore for automotive motors. At least from what I remember:p The overbore numbers for the 400ex and I assume other motorcycle motors are different.

The largest bore on the stock sleeve comes out to 426cc. I don't remember what the .000 number is though.


It should be .080 & .040:)

Thats what I meant. Im kinda out of it today.

[TRXRacer1]

Originally posted by UNBROKEN
well the guy whos building my motor works at a dealership and doing this on the side he telling my dad crap cuz he always disagrees with me and my dad is making me pay the money for him to build it 30 over i guess my motor is going to have no ballz , brapp probaly knows were im coming from This is a fairly easy rebuild and if you have any patience at all this would be a great time for you to learn how to do it yourself. If I were you I'd get a book, acquire some basic tools plus a torque wrench and feeler gauges, find a reputable shop to bore the cylinder and give her a shot.

As far as this old standard way of stating overbores goes, 20 over (.020) would be .5mm. So 30 over would refer to an 85.75mm piston. It's a system that should be forgotten when dealing with metric sizes.

[UNBROKEN]

i kinda wanted to do this my self but the head needed rebuild and the valves were trashed and thats some i knew was going to be out of my league plus its like 30 degres her and i dont have a gargae :mad: so it sucks

[UNBROKEN]

well since the bike will have a 10/1 piston and a stage one hotcam will i be able to use a sparks timming advance key , if so will i gain more lowend power if anyone on here runs one feel free to share ure thoughts,

[drew416ex]

Sparks says you cant run it with more than stock compression because it will cause too much heat.

[JOEX]

Originally posted by UNBROKEN
well since the bike will have a 10/1 piston and a stage one hotcam will i be able to use a sparks timming advance key , if so will i gain more lowend power if anyone on here runs one feel free to share ure thoughts,
You might be able to if you run a higher octane fuel.

[Brauap]

I thought 440 was .080 over.. So, whats a 440?

Also, whats
i guess my motor is going to have no ballz , brapp probaly knows were im coming from supposed to mean?!

And if its about me, it's Brauap, not braap

1 more thing, COULD YOU NOTICE 11.5:1 over 10:1?

[UNBROKEN]

yes BRAUP im talking to u i wasnt saying ure quad had no ballz lol i was saying that parents think they no everything when realy they dont , so after reading this thread if 40 over is 406 and the no it all mechanic is boring mine 30 over well it must be like a 401 , insted of the 416 that i orignaly wanted, cuz my dad said the mechanic says it will cause to much heat, like he even nose cuz he dont even have a borekit on his own 400ex!!! :mad:

[Brauap]

Oh! I thought you where saying I have no balls, lol. And yea, I know where you are comming from. Hey, also, if you look on the Honda Parts, on here, there is a jug, and piston, already installed, for 150. I would buy it, if I had the money. :mad:

[Brauap]

Oh! I thought you where saying I have no balls, lol. And yea, I know where you are comming from. Hey, also, if you look on the Honda Parts, on here, there is a jug, and piston, already installed, for 150. I would buy it, if I had the money. :mad:

[UNBROKEN]

ik man i saw that cylnder and psiton 416 kit i wish i had known about that befor hand now im tring to get a white bros e series slip on or full system those pipes sound mean i like my procircut t4 but theres no quiet core for when i ride on public and i need quiter

[drew416ex]

Originally posted by UNBROKEN
yes BRAUP im talking to u i wasnt saying ure quad had no ballz lol i was saying that parents think they no everything when realy they dont , so after reading this thread if 40 over is 406 and the no it all mechanic is boring mine 30 over well it must be like a 401 , insted of the 416 that i orignaly wanted, cuz my dad said the mechanic says it will cause to much heat, like he even nose cuz he dont even have a borekit on his own 400ex!!! :mad: \

Yeah a 416 wont cause really anymore heat than stock. Compression Is the thing that causes more heat, but you wont have a problem with 11:1 on 93 octane.

[TRXRacer1]

Originally posted by Brauap
I thought 440 was .080 over.. So, whats a 440? .080 over is a standard term and shouldn't even be used with metric pistons but what it's closest to is a 416. The 440 would be (cringing even using this method) a .160 overbore.