psyco1001

ok guys i have a tmaxx 2.5 pretty much stock. it runs pretty good except whenever i decelerate quickly the engine will just cut out. i dont think im running too lean. i know i am a little becaause of the hot engine on occasion. is there any way to adjust the idle other than on the throttle trim? thanks

matts6887

yes, u can adjust the idle with the idle screw which really is the "preferred" way of adjusting the idle. The idle screw should be on the back of the carb. As far as running too lean, it does sound like its too lean to me if it just cuts out like u are saying it does...

tier10

I'd try to richen the low speed needle a bit, if that doesn't help then yes turn the idle speed up a tad. My 3.3 came with the idle speed too high. After the break in, I turned the idle down. Yes it is better to adjust the idle screw and not the throttle trim. Apply the brakes to be sure that the throttle trim is not affecting your idle as you adjust the idle. "think I sound like the owners manual."

psyco1001

thanks alot guys. should i tune the idle while its running or when its off?

matts6887

Well, actually, u can do it either way, but its probably better to do it when its not running. To adjust the idle to the proper setting; pull the air filter off, turn on the radio and apply full brakes; with full brakes applied, u should only have about a 1.25mm opening, or the thickness of a credit card. Once u have it set like that u should be good to go..

iamnot

the answer to that is
yes

you do both
with it off
set the gap to (per traxxas)
.7mm - 1mm

then, after you've tuned
both the hsn and lsn
you fine tune the idle
with the car runnung

psyco1001

which way is which?
like is clockwise a lower or higher idle?

Excell0602

Clockwise = higher idle

CCW =lower idle

Good luck

beer=food

quoted !

Well, actually, u can do it either way, but its probably better to do it when its not running. To adjust the idle to the proper setting; pull the air filter off, turn on the radio and apply full brakes; with full brakes applied, u should only have about a 1.25mm opening, or the thickness of a credit card. Once u have it set like that u should be good to go..



LOL, giggling at that one, do it running , that setting is how it comes from factory, doing it running you can hear the revs, both ways work, you can tune the top end, bottom end, and idle settings all while running, it is better to do so, the engine is hot and up to temp size, carby's expand too, tune your bottom end needle, and set the idle after that is done, if it was set rich you will find you idle revs comming up as you lean it out, screw idle scew out until it idles without catching the clutch, idle is set.
If its lean, and you richen it and it keeps stalling because the idle is to low, a much faster way to re-set it is to use the throdle adjust dial on the transmitter and dial the idle up manually, then screw idle screw in 1/2 a turn and then using the transmitter dial, bring revs back down, do that until its set, looks like alot, but its so simple after you do it once, you'll never forget.

matts6887

Well what exactly is soo funny about that, beer? Hmmm? Last I heard u could do it either way, running, or not running, or both if u choose to do so; set it while its not running, then once the engine is running, re-check the idle gap and set ur lsn and hsn accordingly....

Mspeed

I usually tell people to pull the airfilter off and check the gap with a allen wrench cause so many guys on here are still learning how to tune and might have ended up throwing it all out of wack. So they may end up over compensating for a way off idle screw adjustment by the Lsn. Just for a piece of mind and to help them learn how to do a intial idle set up and then tune it the right way. Hsn, then Lsn, then fine tune the idle all done at operating temps. Alot more to it than that but thats the basics.