idling problem

[mr400ex]

i just installed a wiseco 11:1 piston, stock bore and a hotcams stage 2 cam. my question is that it wont idle. i adjusted the idling screw on the carb and it will idle pretty descent but when you give it a little gas and then let off the rpms still stay up. any help would be much appreciated.

[kickin440]

Did you have your carb off? If so you probably got some dirt or something in it. I would try cleaning it first.

[mr400ex]

i did have the carb off. it seems like the throttle is sticking so maybe, hopefully it its just a little trash in the carb.would the wrong jetting cause it to do this?

[kickin440]

I did the same setup that you have and my jetting stayed very close to the same. But I had the same problem and it wound up being a dirty carb. I sprayed carb cleaner in the holes on the back behind the slide lots of crud came out and it ran like a champ!

[mr400ex]

thanks for your help man. ill try that and let you know how it does

[Glamis400ex]

There seems to really be an abundance of poor idleing 400's with the idle raceing and lowering around right now...weird:confused:

Glamis

[mr400ex]

tried cleaning the carb but still does the same thing. do you think that i need a bigger jet? i have a 170 main jet. should i go with a bigger main jet and change the stock pilot jet

[Glamis400ex]

Main jet has nothing to do with idle.

Its all about the pilot jet and air screw. I have a #42 in mine with 2 and 1/2 turns out on the airscrew. Mines close, but not yet. I may try a #45 pilot.

I've been told a lean pilot will/can cause that condition...

Glamis

[kickin440]

Well I can't help much with any other problems jets and me don't get along. All i can tell ya is I am running a 168 main and stock pilot and it has been working fine for three years so it must be close. Sorry I can't help more. Good luck

[Atreyu]

Take the carb off again and spray some gum cutter in that b!tch :)