final mod do u guys rec this

[Tommy 17]

ok guys how this sound for my final mods to my engine the guy thats gonna build it rob gremly told me at the end of next month he will take it and he wants to do this all for 600 to 700$. this is jetted everything ready to ride.

1 get rid of my xr400 cam and give a a tc racing cam
2 harden my rockers or sumtin
3 valve springs
4 je stock bore 10.8:1 piston
5 220$ worth or porting and polishing
6 k&n filter
and there one more thing but i forgot it.

then he told me if i want to he can mod my stock exaust and carb.

he told me also i have a option of putting on a pipe but that would run me another 434 for the lrd chrome pipe or big gun. he siad its not needed but i will be able to tell a diffenrce wit or without it.

What do u guys think about this anything differnt u think i should do. i wanna go 416 but not yet its a good cylinder still.

[oynot400]

I talked to a guy the other day and he told me that the xr cam and the ex cam are the same thing. That is what I was told, I haven't confirmed that yet.
Check with Mity Mo he has a full LRD exhaust for sale. Other than that go for it! :cool:

[Mity Mo]

If your looking for the LRD big bore I got one. It has been used about 5-6 times. Excellent shape. Sponsor bought me one of his. I go as low as $325 plus shipping. Paid $419 for it from K&K.


P.S. Thanks oynot400 for the plug. Mity Mo:cool:

[Tommy 17]

i would buy ur pipe off u but i ain't gettin a big bore just a regular 400 piston. would it work. how loud is the pipe.

there is a differnce between the xr and ex cam the xr gives u alittle bit more lift or sumtin thats what he told me.

[Mity Mo]

The pipe is fairly loud. You could still use it on your 400. the big bore just gives it larger tubes to move the exhaust out quicker which in turn pulls more air in the motor which increases horsepower. It bolt up the same as any other pipe. It might increase your hp by 2-4 ponies.

[trx400ex]

i would recommend you stay away from the 220 worth of porting, i would just get a 50 cleanup job and spend the extra 170 on something else

[Tommy 17]

naaaaaah i am doin what he reccomends hes built many 400ex and everyone of them is really fast.

[Leo]

10.8 to 1 stock bore JE piston....

hmm....

you sure about that....?

My XR camshaft will be here shortly, I plan on measuring lift/duration of the stock cam before I pull it out, and the XR camshaft after I install it... I've seen so many different numbers for the XR cam that I'm dying to see what I get.

Leo

[tinner]

I remember when I got my stock bore piston the box it was in did say 10.8:1. I talked to Terry from Marcum's and he said it was 10.5:1 for sure. The reason for the 10.8 is probably because it is usable with the XR 400 and that has the higher comp head gasket.

It sounds like it will rock. The price sounds real good to. I spent over 600 dollars for a je piston(10.5), curtis sparks racing cam, valve springs, and hardface rockers. Which i just order today. You should go for the pipe if you got the money. But i would get a sparks racing pipe I have one and really like it. With the stock pipe porting would not be worth it. Also remove the choke plate from the carb if you are using the stock carb.

[Tommy 17]

i dunno he told me 10.8:1 je. i think i am goin to do a stock exaust and buy a-arms and shocks instead. i think i will be better off he told me its a differnce but one that i can't make up with a-arms and shocks. this guy knows alot.

[99'300EX]

i heard XR cam and EX cams are the same....dont know for sure though.

-LaTa-

[nakomis0]

Thats close to the same set-up I have, except I'm big bore and a different cam. Sounds like it will scream.

I'll tell you from experiance, all the gains u get from that motor work will feel almost 'double' when you add a nice carb. no **** either

[Chef]

what i was wondering, is if you went through all the common bore sizes but had all the other stuff done to the motor, like a shoot out between a stock bore, 416, 440, 465 etc.. and they all had everything you could do like oversize valves and all, which would out perform the rest

[Mity Mo]

The 416 or 426 would be the winner. The slugs in the 440 and 465 are larger which means they cant reach a power rpm range as fast as a 416 or 426. I have built all 4 sizes and my 426 will outrun them all. But of course alot has to do with the rider also.

[Chef]

and mity mo, you have a tight ***** ride, any pics?

Let's play nice guys....:D :D :D

[nakomis0]

I'm going to say thats bull about a 416, beating a 440, or 465. So it revs faster..wooo. How much faster we talking about here?

And if your putzing around your yard, it may seem faster. But if your haulin arse, and your rpms are never under 6k, like you would be racing, than the 440 is faster.

For track maybe a 416 is more practical, because u will get out of corners slightly faster. And things come up where not every turn can be in the optimal rpm range.

Like I always say when this topic comes up.

If the 416 is such a high revving fast machine, why is it so much slower than a Raptor? I mean ##### I could probably peddle faster than that big old 660 bore, right?

Like the old Chinese proverb ... "No replacement for displacement":p

[trx400ex]

the modified chinese proverb..... there are many hills to the top of the mountain, but the view is the same

[Mity Mo]

Here are some pics I found from the beginning of the year. Most of this year I was out with Knee Surgery so I dont have alot from this year. But here are a few:p C:\My Documents\My Pictures\mo's ride.jpg

[wyndzer]

I've had a 440 and currently have a 416. The 416 is by far the best combo I've seen. Keep in mind that you need to build your motor for the riding you do. If you need porting well then port it. If you need a big carb, then get one. If you just change the piston, then a 440 will probably be better than a 416. But only changing bore size in my opinion is a waste of time.

[Pro400EXC]

I have to add my 3 cents. I've talked to a guy who works for JE pistons and he told me that the dirtbike and quad pistons they sell are made from Wiesco and that JE doesn't make there own pistons for off-road machines YET. He said that Weisco makes them and they do a few other things to them when they get them back. I am tellin the truth. I won't lie about this.

Well,,,,,,,,,didn't know that...:huh