when i start my engine its like it doesn't want to run. i had to turn up the throttle dial on the radio to keep it running and then when i go to give it gas it dies out . I Changed the glow plug and the one in it looked fouled so i started it back up and it started fine and randorve it about twenty feet and went to give it a little more gas and it died again any help please
-
Welcome to RCTalk! 🚀
Join the #1 RC community where hobbyists connect, share, and get expert advice on RC cars, trucks, boats, drones, and more!
- ✓ Friendly & passionate RC enthusiasts
- ✓ RC tips & troubleshooting
- ✓ Buy, sell & trade RC gear
- ✓ Share builds & upgrades
traxxas 2.5 keeps die ing
- Thread starter TdoubleOG
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
links, including eBay, Amazon, and others.
- Messages
- 35,104
- Reaction score
- 1,854
- Points
- 2,198
- Location
- In my recliner
- RC Driving Style
- Bashing
- Flying
This is probably the most often asked question on this site. Do a search on 2.5 within this forum, and you'll find an encyclopedia of information. Try 2.5 carb, or Traxxas 2.5, etc. You'll be amazed how much info you'll get.
What you find, you can copy and print out for future reference.
What you find, you can copy and print out for future reference.
Is this a new engine? Have you broken this engine in? I know that there are carb settings that you need to set prior to starting up for the first time. If in doubt of your carb settings the return all needles to factory settings.
IMO you are running too lean on the LSN. You may want to richen that needle up an 1/8 till she runs smooth.
Let us know
Jon
IMO you are running too lean on the LSN. You may want to richen that needle up an 1/8 till she runs smooth.
Let us know
Jon
30%NitroBoy
Hardcore RCTalk User
- Messages
- 1,671
- Reaction score
- 0
- Points
- 0
- RC Driving Style
What he said, I'm sure your engine just isn't tuned properly. THe 2.5 can be a tuning nightmare and it can be very sensitive to tuning and holding a tune.
- Thread starter
- #7
it has about a gallon through it
never messed with the low speed needle its still in the factory setting
never had a problem with the engine untill now when i didnt run it for about a week
started it back up and it sounded like poop and started cuttin out
ill try the lsn and see what happens
i wwasnt tryin to tune it just keep the damn thing runnin thought it might need to run for a minute to get warmed up
never messed with the low speed needle its still in the factory setting
never had a problem with the engine untill now when i didnt run it for about a week
started it back up and it sounded like poop and started cuttin out
ill try the lsn and see what happens
i wwasnt tryin to tune it just keep the damn thing runnin thought it might need to run for a minute to get warmed up
the LSN should be flush with the carb but try the adjustments first. Also check the plug. What type is it? The needle settings are still factory ? Does that mean you never touched them? If so then you may have to start tuning for speed on that puppy. Another thing, when you let the engine cool down, are you making sure that the piston is at BDC or Bottom Dead Center? Leaving at TDC or Top Dead Center can cause you to loose that "Pinch". ARO all the time after running too.
Jon
Jon
- Thread starter
- #9
the lsn setting and the idle is at the factory setting I've messed with the hsn its at about three and a half or four turns outheard that was were it should be and it was runnin good there the plug is traxxas heavy duty long medium the same one it came with.Ill do the bdc thing from now on
and i leaned out the lsn an eight a turn or so and i could drive it with some throttle (about 10 to 20%) but i go to give it anymore and it dies out again should i just keep leaning it till i can give it full throttle?
and thanks for all the help
if it wasn't for rcnt i would be hairless , not just balding:fro:
NO I said richen it up. I mean counter clock wise. Clock wise is leaning out the needle. Try doing your adjustments in 1/8 increments so you know exactly where your adjustment was found to be optimal.
Oh yeah. How fresh is your fuel? Have youleft any fuel in the tank or do you run the tank dry? If you leave fuel in the tank you will find yourself to have old fuel settling in your crankcase and building up. That is not ideal. I try to pinch the fuel line right before the carb so it may run a little lean but it will use most of the fuel in the carb and crankcase.
Let us know
Jon
Oh yeah. How fresh is your fuel? Have youleft any fuel in the tank or do you run the tank dry? If you leave fuel in the tank you will find yourself to have old fuel settling in your crankcase and building up. That is not ideal. I try to pinch the fuel line right before the carb so it may run a little lean but it will use most of the fuel in the carb and crankcase.
Let us know
Jon
- Thread starter
- #11
it sat for a couple days with some fuel in the tank
i emptyed it out before i ran it again and added new fuel
and for stopping it if the bodys off i pinch if its on i plug the exhaust. but i havent had to worry about killin the engine lately cause it magically stops all by its self over and over and over again
and for readjusting the lsn ill have to do that tommorrow
the neighbors might get pissed
i emptyed it out before i ran it again and added new fuel
and for stopping it if the bodys off i pinch if its on i plug the exhaust. but i havent had to worry about killin the engine lately cause it magically stops all by its self over and over and over again
and for readjusting the lsn ill have to do that tommorrow
the neighbors might get pissed
lol ok I recommend not plugging the exhaust rather pinch the fuel line right at the carb. If your engine is tuned right you won't be doing damage to your mill. Plugging up the exhaust like you said forces fuel into your carb and crankcase leaving unused fuel in the engine. Not good. We'll talk tomorrow. wife is calling.
Good night.
Jon
Good night.
Jon
- Thread starter
- #13
I tore my truck apart . reset every thing to the factory specs
and told rusty
:stickup: you gonna die if you dont run right :stickup:
so tommorrow its gonna run just fine
should of done that in the first place
Thanks for the help
and told rusty
:stickup: you gonna die if you dont run right :stickup:
so tommorrow its gonna run just fine
should of done that in the first place
Thanks for the help
Last edited:
- Thread starter
- #14
so i started her up just now started fine
drove around the driveway fine with about ten % throttle
go to give it a little more and buuuuuuurrrrrrrrp it dies
richened the lsn
nuthin changed
richened the hsn
nuthin changed
checked the plug and it looked fine just a little wet
drove around the driveway fine with about ten % throttle
go to give it a little more and buuuuuuurrrrrrrrp it dies
richened the lsn
nuthin changed
richened the hsn
nuthin changed
checked the plug and it looked fine just a little wet
Lol like a poem.
well this is in a rustler right? I have had the same problem and I repaced the plug. What is your idle set to? Is she idling high? I checked for any air leaks as an air leak can wreak havoc for tuning. so you have a temp gun? If you do you shoud temp the engine and see what she is running at. If you can go WOT from the start then you are definitely running lean. ANY nitro engine needs to be warmed up before you can feel the power.
Let us know
Jon
well this is in a rustler right? I have had the same problem and I repaced the plug. What is your idle set to? Is she idling high? I checked for any air leaks as an air leak can wreak havoc for tuning. so you have a temp gun? If you do you shoud temp the engine and see what she is running at. If you can go WOT from the start then you are definitely running lean. ANY nitro engine needs to be warmed up before you can feel the power.
Let us know
Jon
- Thread starter
- #16
yeah its in a rustler
just got back from the lhs
bought new fuel line thought that the fuel filter might be causing a leak
changed the plug the other one looked like i was running rich (kinda wet) the element was fine on it
started her up and for a second it looked good then back to the buuuuuuurp die and repeat
dude from the hobby shop said it sounded like i was runnin rich
and to go back to the original lsn sett. and lean a 1/16
I'm down to try anything at this point
I'm gonna try it and see
allright
nothing changed starting fine idle fine go to give it gas and buuuurp it dies
it seem it doesn't matter where the lsn and hsn are set
besides glow plug and fuel lines could it be something else that I've overlooked?:stupid: wait I'm alone OHHHHH I'm stupid i got it
just got back from the lhs
bought new fuel line thought that the fuel filter might be causing a leak
changed the plug the other one looked like i was running rich (kinda wet) the element was fine on it
started her up and for a second it looked good then back to the buuuuuuurp die and repeat
dude from the hobby shop said it sounded like i was runnin rich
and to go back to the original lsn sett. and lean a 1/16
I'm down to try anything at this point
I'm gonna try it and see
allright
nothing changed starting fine idle fine go to give it gas and buuuurp it dies
it seem it doesn't matter where the lsn and hsn are set
besides glow plug and fuel lines could it be something else that I've overlooked?:stupid: wait I'm alone OHHHHH I'm stupid i got it
Last edited:
- Thread starter
- #18
the lines are on right and the engine is gettin gas.
I took the fuel filter off .
It seems to be running rich there is oil coming from the exhaust
but when i go to lean out the hsn it dies
should i lean the lsn? its at the factory setting
I took the fuel filter off .
It seems to be running rich there is oil coming from the exhaust
but when i go to lean out the hsn it dies
should i lean the lsn? its at the factory setting
- Messages
- 35,104
- Reaction score
- 1,854
- Points
- 2,198
- Location
- In my recliner
- RC Driving Style
- Bashing
- Flying
It's been my experience that the 2.5 reaches a stubborn period in it's early life. With about a gallon through it, you're about at that point.
Try this, it works for me, and I've done it with 5 2.5 engines, including my own. Put the car's nose against something so it can't get away from you. Have a small screwdriver ready to adjust the LSN. Let it idle till it's up to temp. It's USELESS to try to tune a cold engine.
When it's warmed up and idleing, give it some throttle, but no more than half. If it surges quickly, then dies, it's too lean. If it bogs, it's too rich. Adjust it till it performs from idle to half throttle. Now adjust your idle screw till it runs without stalling, and doesn't chatter the clutch. Adjust the idle with the radio trim set all the way down.
Take it out, and now start running to full throttle. This is where you start to adjust your HSN. Same thing, if it bogs, it's too rich, and if it's really fast but doesn't get good top end, or stalls at full open throttle, it's too lean. Keep an eye out for a nice trail of blue smoke.
When it seems to be running good, run about a half tank through it, then bring it back and pinch off the fuel line and count the seconds till it shuts off. It will idle up to a higher RPM and then shut down. This should be 3 to 4 seconds. If it shuts off quickly, then your LSN is too lean. That's not good. Richen it slightly, run it again and do the pinch test again.
Good luck. They can be pesky, but when they run right they're a joy.
Keep us posted.
Try this, it works for me, and I've done it with 5 2.5 engines, including my own. Put the car's nose against something so it can't get away from you. Have a small screwdriver ready to adjust the LSN. Let it idle till it's up to temp. It's USELESS to try to tune a cold engine.
When it's warmed up and idleing, give it some throttle, but no more than half. If it surges quickly, then dies, it's too lean. If it bogs, it's too rich. Adjust it till it performs from idle to half throttle. Now adjust your idle screw till it runs without stalling, and doesn't chatter the clutch. Adjust the idle with the radio trim set all the way down.
Take it out, and now start running to full throttle. This is where you start to adjust your HSN. Same thing, if it bogs, it's too rich, and if it's really fast but doesn't get good top end, or stalls at full open throttle, it's too lean. Keep an eye out for a nice trail of blue smoke.
When it seems to be running good, run about a half tank through it, then bring it back and pinch off the fuel line and count the seconds till it shuts off. It will idle up to a higher RPM and then shut down. This should be 3 to 4 seconds. If it shuts off quickly, then your LSN is too lean. That's not good. Richen it slightly, run it again and do the pinch test again.
Good luck. They can be pesky, but when they run right they're a joy.
Keep us posted.
