I really don't see what you are complaining about then. If it is that fast (beating banshees at their own game, top end) then what more could you be expecting? If you were wanting dragster like accelleration, you should be building a dragster.

 

You should get a bigger carb and then you will not be able to hang on.

 

Fast453ex, I have a 440 kit with ported and polished head, with XR400 cam, with 10.8:1 JE piston, Curtis Sparks Complete exhaust and CDI, K&N, Modified Air Box Lid and the proper jetting. We also make and special manual work to the piston and wristpin to take out all the extra weight from them, and at the end their weight was the same that a stock piston and wristpin, so it should rev really fast.
But, I'm in the same situation that you, I'm not satisfy, the machine rev fast, and have plenty of torque, but something is missing. And I know for sure that I need a better, bigger CARB.
I have been told that it will make a big improve in my setup.
But I need some back up of what everybody thinks is the best for it. I have to think twice before spend almost 400 bucks in a 39 FCR.

CAN SOMEONE HELP US WITH THAT??

THANKS.

 

I put a Lectron on my 400EX last summer and to tell you the truth i didn't notice a "world" of difference. It pulls a little harder. Mine has to get leaned out a little more though, because i even removed the whole airbox assembly, and my plug is still a little bit too black. I also don't like the way you have to "make" your Lectron fit. Good price, but i kinda wish i would have waited and got the FCR39mm.

 

I think a big air carb would be awsome, they have no main jets to change! Just a needle that has 30 settings and can be adjusted by a **** in 10 seconds, this is the ultimate setup, I hate jetting mine!!!

 

Well, I'm agree what we need is a better, bigger carb.
I just saw yesterday that carb. I mean, in the February 2001 ATVSport magazine, they make a review of the psiperformance 250R Genesis Kit, and they are using a 32mm x 40mm Genesis Big Air Carb, and don't have jets, or require disassembly for adjustment.
"All they require is an allen wrench on a 25 clicker adjustment that moves the needle up and down a total of .250 inches".

www.psiperformance.com

I don't know how it work on a four stroke engine, they are testing it in a 250R.

 

Boring out an engine weakens the reliability.
I'll do everything to mine exect boring it out. They need to be rebuilt to often.

2000 SCRAMBLER 400 2X4

SCRAMDADDY400

 

EXACTLY, they look awsome! I dunno if they'd work on a 400 but maybe? Also scramdaddy 440 or a 453 like mine isn't too bad, there's still quite a bit of head left there, they probably won't need a rebiuld for a while but with a 2 stroke it may not be a good idea.

 

Fast,
It looks like everybodys has you back on track... Just get out the check book (again)

 

Hey Fast453EX, I see in your sig that you lowered the front of your quad 3 inches, did you lower the rear also or just the front? And Why????