440ex

[Dustin075]

I have started to install a 440 bore kit, stage 2 hot cam and a 450r carb. Do i need to start thinking of how to cool this thing down? I do alot of trail riding. I was reading that post about that fan. Is it a good idea?

[TRXRacer1]

Originally posted by Dustin075
I have started to install a 440 bore kit, stage 2 hot cam and a 450r carb. Do i need to start thinking of how to cool this thing down? I do alot of trail riding. I was reading that post about that fan. Is it a good idea? What compression piston are you using?

[Ruby Soho]

put in HD studs.

[79400ex]

you shouldn't have any trouble cooling that motor. Just run a go quaitly oil.

[Dustin075]

11:1

[TRXRacer1]

Originally posted by Dustin075
11:1 At 11:1 you should be fine but watch out for detonation. If you ride it hard you might start getting some pinging without a little higher octane fuel. There's a million factors that people can bring up but you're safe enough here to go out and try it.

[Dustin075]

so some 110 octane or so and good oil. what do you recommend for oil? i have been running gn4. what are hd studs?

If your breaking it in doent use synthetic but if you already broke it in I highly suggest runningsynthetic for 4 strokes. Mobil Synthetic is great to use

[Dustin075]

is gn4 ok for the break in? i am going to finish putting it together this weekend so i would like to gather up all the stuff i am going to need.

[TRXRacer1]

Originally posted by Dustin075
so some 110 octane or so and good oil. what do you recommend for oil? i have been running gn4. what are hd studs? 110 is over kill, I doubt you'll need 100.

As far as oil gn4 is perfectly fine. Conventional oil has GREAT protection qualities so if you change it frequently don't waste your money on something fancy. I run Valvoline 4-stroke motorcycle oil with a Fram filter and just had to service the engine for the first time in 5 yrs.

HD studs refer to the cylinder head studs. When you go big like you did the stock ones like to pull out. A lot of guys buy bigger studs but all you really need is for a machine shop to install steel inserts.

[Dustin075]

where can i find the steel inserts at? i am kinda nervous on building this thing. i dont want to get it all together and ride it for a hour and break down on me. so iam trying to gather all the info that i can, and do it right.

[XXXRACER165]

I say you should be fine I got a 440 and running it on 92 octane pump gas, and GN4 oil. Just what I do during the summer is use Bel-Ray 20w-50 wich is a thicker oil for more wide open riding.

[Ruby Soho]

i run a 440 on 11:1 on pumpgas/93 with usually 20w50 in summertime, and i have never had any kind of problem besides the studs. i blew 2 gaskets and got the GT studs installed and its been great ever since

[Dustin075]

how do these studs work? do you have to retap the head to insert them or have a machine shop do the work.

[TRXRacer1]

Originally posted by Dustin075
where can i find the steel inserts at? i am kinda nervous on building this thing. i dont want to get it all together and ride it for a hour and break down on me. so iam trying to gather all the info that i can, and do it right. I've always just had the machine shop pick them up when I've needed them.

[416exfreak]

At 11:1, just mix 1 gallon of 110 octane with 4 gallons of 93 or 94 octane.

And HD studs are bigger head studs that allow you to put more torque on the Head, which will keep you from blowing a head gasket and messing up your engine. If you dont have them, I highly recommend them.

I tried running a 440 kit without them. It didnt work.

You shouldnt have a problem keeping it cool. If you feel that its getting to hot, then just pull over and let it cool off for a few minutes.

[TRXRacer1]

Originally posted by 416exfreak

And HD studs are bigger head studs that allow you to put more torque on the Head, which will keep you from blowing a head gasket and messing up your engine. If you dont have them, I highly recommend them.
The reason you install hd studs is because they are bigger allowing a larger bite into the aluminum. You don't need more torque, you just need that bigger bite to hold them from pulling out. Steel inserts do the same thing and they're way cheaper then the rip off $60 HD studs.

[Dustin075]

will my local honda dealer have them or will i have to order them off of a wedsite? (the studs)

[TRXRacer1]

Originally posted by Dustin075
will my local honda dealer have them or will i have to order them off of a wedsite? (the studs) Go to GT thunders site but I'm tellin' ya, they're a rip. I've built many engines over the years and this is one of those products that people sell because your average guy doesn't know better. That's all I'll say on that........

Didn't you buy this jug with the 440 kit already installed? Maybe it already has the studs. Go to GT Thunders web site and look at the differences between stock and HD.

[Dustin075]

yes i did buy the jug with the 440 kit already installed. i never thought to look. i know that there are no studs in the jug. i was just going to buy new stock one but with this new info for get that idea. the steel inserts seem to be the way to go on this. is there a kit with steel inserts and studs that i can buy?

[TRXRacer1]

Originally posted by Dustin075
the steel inserts seem to be the way to go on this. is there a kit with steel inserts and studs that i can buy? No kit. I assumed you already had studs, my bad. It's still cheaper to get the OEM studs and go with inserts but not by much, maybe $20. In your case the HD kit from Gt Thunder might be the way to go.

[Dustin075]

so the kit has steel inserts and studs, and have machine shop do that work. right?

[TRXRacer1]

Originally posted by Dustin075
so the kit has steel inserts and studs, and have machine shop do that work. right? The GT Thunder kit doesn't need inserts because the studs are bigger then the stock ones giving that extra bite I was talking about in the aluminum. After you get the kit you will want a shop to install them.

[TRXRacer1]

HD Stud Kit (http://www.gtthunder.com/TRX400EX.htm)

[Honda_Matt]

so the heavy duty studs replace the 4 studs that are sticking out of the crank case?

a shop would remove the stock studs and then re-tap the case for the bigger studs to be installed?

[TRXRacer1]

Originally posted by Honda_Matt
so the heavy duty studs replace the 4 studs that are sticking out of the crank case?

a shop would remove the stock studs and then re-tap the case for the bigger studs to be installed? The kit replaces the studs sticking out of the cylinder not the crankcase.

[Honda_Matt]

/\ My bad.

Thats what I meant, the cylinder.

the stock cylinder has the stock studs, but the 440 cylinder he bought doesnt have them.

[boosted3g]

you can also order the studs from arp for 8 dollars a peice and a couple bucks you can get nuts and washers. My bet is they are far stronger than all these kits you see. Do the steel inserts and arp studs and you will never have a problem.

[Dustin075]

ok ok i got it now. going to buy that kit and should be ready to rock on putting her together. any other tips on putting her back together?

[BigBore24]

if you dont know the age of your timing chain i would go ahead and replace it while you have it apart. Not trying to be negative or anything i just no that i put mine all back together then a month or so later the timing chain jumped off and so i had to tear it all down again. but whats worse than that is that if it jumps a couple teeth on the cam while your riding your piston could smack a valve and do lots of damage, I speak from experience on that. lost a couple hundred bucks and bout a month of riding

[Honda_Matt]

The bike is an 05' with not a whole lot of riding time, its safe to safe the timing chain is more than likely a-okay.

[DF400ex]

Originally posted by Honda_Matt
The bike is an 05' with not a whole lot of riding time, its safe to safe the timing chain is more than likely a-okay.

It's recommended that you upgrade the cam chain but not everyone does it.

One thing that I cannot recommend enough is a really good head gasket. I've only used Cometic gaskets with no problems. They are amoung the best. I built my friends 440 and he insisted on a stock head gasket against my advise. Sure enough it blew a after a month of riding, and he had the GT Thunder HD stud kid as well.