r4rosal

good day all,
i have this problem on my tmaxx 2.5.
when you rev high or run on wide open throttle, the idling does not return to normal or drop down.

there's no problem with the carb, i checked it and the throttle is 1mm from close position but the idling is still very high.

in the first few minutes of running, the engine seems to be fine but after around 5 mins of running then this problem occurs.

please anyone give me advise

thanks

BaSh_2_tHa_mAxX

My Feedback: (1)

It could be your carb getting stuck. Check and see if your carb moves smoothly and freely open and close. If not then hit it with some wd 40 and all problems solved.

Afterburn1

My Feedback: (1)

or if your runnin rich.

r4rosal

bash_2
i checked the carb, but the throttle opening is almost close but still the engine rpm is very high. i've already loosened the idling screw so the carb will close.

afterburn
i tried leaning out and richening the mixtures but still the rpm very high.

engine has no low rpm, just keeps revving even if the carb almost close.

it's making me crazy on how to keep my trx run fine.

i've tried 3 types of fuel, 15 and 20 nitro, even bought a fresh gallon but still no luck.

checked the piston and sleeve and still have very good fit ( run my trx only for about a can of soda of fuel before this problem arise )

please guys any more ideas? can't afford to buy a new engine

thanks again

Afterburn1

My Feedback: (1)

You've tried three types of fuel in one motor!?!?!?!?! Differant nitro percents even!?!?!?!?! Get a new motor.

stilllost

My Feedback: (3)

ahhhhhhhhhhhhh sounds like you have a possible air leak some where. i had this problem with a brand picco .21 engine. man was i man mad. that thing ran like a champ for the first five minutes but when things got to temp thats when it did the same thing. i found that the o-ring was pinched. replaceed it still no luck so added a o-ring where the hsn housing screws to the carb and wah lah gone.

what happens is when they get to operating temps the metal kind of shrinks and thats when it happens. one other thing to check yoour carb might have moved in a crash and its getting air thru there.

stay with it and keep us posted

Afterburn1

My Feedback: (1)

I agree with what you are saying but metal expands when it is hot. The problem is when you have two differant types of metals right next to each other and they have differant molecular compounds that makes them expand and contract at differant rates. When they are cold everything fits tight, as they expand one expands faster than the other and creates a gap.

stilllost

My Feedback: (3)

dam it let me get my dictionary let see molecular and what that other word ? hey after burn you following me

Afterburn1

My Feedback: (1)

LOL, Just tryin to give a specific example. sorry lol............. How bout this, it's when that do-hicky thingy there by the bumjigger gets all dang ole hot and done swells up faster than larry's aunt may at a buffet.

Afterburn1

My Feedback: (1)

LMAO, that's pretty funny

r4rosal

i'll try to check out for possible air leaks, but as far as i could recall i've already put some silicone gasket on some areas. i'll check it out and post back updates.

thanks a lot guys

stilllost

My Feedback: (3)

lmao........... i wasn't sure which way it went but i knew what i was trying to say. where was that there buffet. over yonder. lol i understood everything you just said. wife is from bama. lol i'm from socal

stilllost

My Feedback: (3)

how did you sbout larry's aunt

Afterburn1

My Feedback: (1)

LMAO, bring me some grits! and some gumbo! don't forget mah beer sinceuwas. Tell billy to stop tryin to kiss sally! Dammit, I knew I shouldn't have had a kid with your sister.

BaSh_2_tHa_mAxX

My Feedback: (1)

Check to see that you seal your fuel tank correctly and that the lid clsoes tightly and possibly replace your fuel lines.