hi i have a nitro rustler with a 3.3 on it I'm kinda new to nitro rc but i have had my rustler to my local hobby shop and still can't find the issue! once started it will run maybe 20 seconds then quit! if i apply throttle and drive it it will run all day but as soon as i stop it quits whether applying brakes or not! any suggestions?
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nitro rustler idle problem
- Thread starter tony12
- Start date
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Metalhead Matt
RCTalk VIP
Turn the idle adjustment screw in a little? Pop the air filter off and see how much of an opening there is in the carb. Should be around 1mm. If opening it up a little doesn't help, you may have something out of whack on the needles. Or an air leak.
- Thread starter
- #3
what do u mean something out of whack with the needs like the high end and low end adjusted incorrectly? I've set them all to factory and then went forward but still nothing! I'm checking for an air leak! hobby store says MAYBE a carb. think thats a possibility?
Metalhead Matt
RCTalk VIP
Factory settings are only for initial break-in. Every engine needs to be tuned for performance and they're all different. Do you have a temp gun? If not, get one. Temp spikes are a good indication of an air leak. How far open is the carb with your finger off of the trigger? Take the air filter off and turn on the transmitter and radio gear, engine off. Then we'll go from there.
ThunderTiger
Hardcore RCTalk User
this may sound a lil' stupid, but have you checked that the idle screw is stopping the carb closing all in beyond the .8mm you have set ?
Also, have you tried a new glow plug ?
Also, have you tried a new glow plug ?
ThunderTiger
Hardcore RCTalk User
have you tried richening the LSN a little ? It may be that it's stopping fuel flow enough at idle to stop itself running.
Metalhead Matt
RCTalk VIP
Fuel is a good engine cleaner. Just don't soak the boot in anything. With that small of a gap in the carb, I'm leaning towards turning the idle up still. What exactly does it do when you turn in the idle screw?
ThunderTiger
Hardcore RCTalk User
personally ? I would prefer to try richening the LSN a little to see if it helped, then and only then, would i consider anything else. My first option would be cghecking the needles are clean from muck. There really is no need to remove the carb.
- Thread starter
- #12
i can maybe get the idle screw to about 1mm any higher and the motor is running too fast and it wants to take off! if i do a full speed run and a few little quick spins and stop it runs 30 seconds... tops... then just dies but in 1 pull it starts back up and i can take off! its more a nuisance than anything not really a major problem
ThunderTiger
Hardcore RCTalk User
Tony, it sounds from what you say, like it's "loading up", indicating a rich tune..............
On the otherhand, it could be running on the lean side on the LSN causing it to die....
Does it idle then die, or idle, climb in revs then die ?? (both require different solutions).
On the otherhand, it could be running on the lean side on the LSN causing it to die....
Does it idle then die, or idle, climb in revs then die ?? (both require different solutions).
ThunderTiger
Hardcore RCTalk User
sounds like it could be rich on the low end, but..........
Do youself a favour, screw the HSN needle in by Half turns until it is closed, keeping a count, I.E Half, one, one and a half, two etc etc.
WRITE down how many turns out you were, then check it against "Factory" settings, if the count is higher than factory settings it is too rich. You generally find that an engine runs around 1 turn leaner, but it varies from engine to engine.
The LSN needle should be flush with the housing.
Of course, my suggestions could be totally nullified by another member.................but thats one of the methods i have used when i have had issues with engine tuning.
Do youself a favour, screw the HSN needle in by Half turns until it is closed, keeping a count, I.E Half, one, one and a half, two etc etc.
WRITE down how many turns out you were, then check it against "Factory" settings, if the count is higher than factory settings it is too rich. You generally find that an engine runs around 1 turn leaner, but it varies from engine to engine.
The LSN needle should be flush with the housing.
Of course, my suggestions could be totally nullified by another member.................but thats one of the methods i have used when i have had issues with engine tuning.
- Thread starter
- #16
maybe I'm completely wrong with this thread! when started should my rusty idle until i shut it off? or when i stop running it should it idle until i stop it? i just read on another forum and a post says it should only idle for around 20-30 seconds then quit! this is exactly what mine is doing!!!!
ThunderTiger
Hardcore RCTalk User
If you have the engine tuned right for good top end with a nice smoke trail and the bottom end gives a good punch off the line giving a good smoke trail at idle, your golden.
The 20-30 second idle before flame is is true to a point, that said, every engine I have had or tuned, will idle well beyond the 30 second mark.
Basically it is all in the tuning. An engine running rich will flame out early as will a lean engine.
I was taught that "a well tuned engine will idle beyond 30 seconds and remain stable"
Hell, my .21 t/tiger engine will idle through a full tank and my revo will idle all day if I want it to, but that is because I have them tuned to perfection. Even my os .30 will idle through a full tank.
It comes down to tuning and how well it is done. A good tune will be slightly richer than peak power.
The glow plug tells you a lot too. If it is sooty black and oily, the engine is running rich, if it is clean (loke new) with a compressed coil, the engine is running too lean.
If the plug is a light gold colour and the coil is clean but not compressed, chances are the engine has a good tune on it by being run not too rich and not too lean.
Right, who's gonna flame me for what I just said ??
The 20-30 second idle before flame is is true to a point, that said, every engine I have had or tuned, will idle well beyond the 30 second mark.
Basically it is all in the tuning. An engine running rich will flame out early as will a lean engine.
I was taught that "a well tuned engine will idle beyond 30 seconds and remain stable"
Hell, my .21 t/tiger engine will idle through a full tank and my revo will idle all day if I want it to, but that is because I have them tuned to perfection. Even my os .30 will idle through a full tank.
It comes down to tuning and how well it is done. A good tune will be slightly richer than peak power.
The glow plug tells you a lot too. If it is sooty black and oily, the engine is running rich, if it is clean (loke new) with a compressed coil, the engine is running too lean.
If the plug is a light gold colour and the coil is clean but not compressed, chances are the engine has a good tune on it by being run not too rich and not too lean.
Right, who's gonna flame me for what I just said ??
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