Gregw1
RCTalk Basher
Hey guys I bought a used T Max 3.3 and it seems like no matter what I do weather there's plenty of smoke or not much I still get this PING NOISE when I'm off throttle and it stalls. Anyone have an idea?
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- Thread starter Gregw1
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Reset the needles to factory settings, and go from there.
Tunedfrog
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^^^ +1
I agree, setting the needles pretty much flush with the housing should get you in the ballpark and then adjust only about a hour at a time as if you were looking at a clock.
I agree, setting the needles pretty much flush with the housing should get you in the ballpark and then adjust only about a hour at a time as if you were looking at a clock.
cbaker65
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If you bought that used ,then no telling how it was stored or if the carb has been sitting ,chances are ,carb is gunked up ,or
the needle o-rings are harden ,dried up an cracked ,or even a tank lid seal could be bad an not enough tank pressure!...?
Tunedfrog
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My bad, I didn't the "used" and I agree..
cbaker65
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LOL....That is why I dont like to give advise on nitro tuning ,you dont know the history or how the folks are treating them!
On my engines the first thing that I do ,is actually run the needles in an count each turn where they were at an write it down
on paper ,there is a factory set ,but there is a tune set ,then that way ,I have a reference to where I had it when it ran good on
the tuned setting!
An air leak or fuel leak will throw any tune out the door ,even a bad pressure issue from the tank!...
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That's a fact and usually a very tiny hard to see pin hole.
I just had a dried out/shrunken HSN o-ring give me fits the other day. Guess that's what happens when you fire up a nitro once every other year. lol! Stupid thing was screwing itself in/out as it ran. Would be pig rich one minute, then screaming mimi lean the next.
Any time I get a used engine, if it has compression, I take it completely apart, clean it, inspect it, looking for wear in the con-rod, bearings and cracks in the crank case, seal the typical spots with RTV (not really necessary if the o-rings are good), set the carb to factory, replace o-rings/gaskets if I have them and start from there. Then at least I know all the screws are tight and there aren't any apparent mechanical issues inside.
Regardless though, any time I get a used truck with a used engine on it, I consider the engine garbage and treat it as such until proven otherwise. I typically replace them with a new engine anyway, or at least one I broke-in and have on hand.
Any time I get a used engine, if it has compression, I take it completely apart, clean it, inspect it, looking for wear in the con-rod, bearings and cracks in the crank case, seal the typical spots with RTV (not really necessary if the o-rings are good), set the carb to factory, replace o-rings/gaskets if I have them and start from there. Then at least I know all the screws are tight and there aren't any apparent mechanical issues inside.
Regardless though, any time I get a used truck with a used engine on it, I consider the engine garbage and treat it as such until proven otherwise. I typically replace them with a new engine anyway, or at least one I broke-in and have on hand.
monstertruckier15
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I suspect you don't have a fuel filter and crap got stuck in the carb. T-maxx's never came with a fuel filter. This causes a lean run and can damage the motor causing this problem.
nitroxin
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hello I have the same problem .,No time to work out right now , It is most likely what others have posted .My list is is like this
1 check factory needle settings 2 Make sure fuel getting to motor . Tank lids like to leak ,,new o ring . 3 Change to to a new plug .,even one the lights can b bad .Also the right plug , hard to tell whats in used engine ,4 check for air leaks every where carb mount ..new line ,
engine back plate , seal it with good gasket maker and carb o rings of fit .5 Remember pinch test for low needle setting .Engine should speed up in two or 3 seconds . 6 con rod stretched ..6 bad piston ,liner . 6 bad fuel ,,old or what ever .
I know its a lot to check . start with the easy things and go down the list ..
Good luck .these little engine can be very aggravating , more often then we like to admit .
But once there on ....oh the smell of nitro in the morning !
1 check factory needle settings 2 Make sure fuel getting to motor . Tank lids like to leak ,,new o ring . 3 Change to to a new plug .,even one the lights can b bad .Also the right plug , hard to tell whats in used engine ,4 check for air leaks every where carb mount ..new line ,
engine back plate , seal it with good gasket maker and carb o rings of fit .5 Remember pinch test for low needle setting .Engine should speed up in two or 3 seconds . 6 con rod stretched ..6 bad piston ,liner . 6 bad fuel ,,old or what ever .
I know its a lot to check . start with the easy things and go down the list ..
Good luck .these little engine can be very aggravating , more often then we like to admit .
But once there on ....oh the smell of nitro in the morning !
monstertruckier15
RCTalk Addict
The carb is always the place to start.
