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Old 05-26-2010, 06:04 PM   #1
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Default trx 2.5 engine runs for maybe 5 min then stalls

i have a traxxas 2.5 engine that runs for a few minutes and then stalls. i have tried adjusting the lsn and hsn, with no help. blue smoke comes out under full throttle, but very little at idle, 1/3 throttle. would driving at a low speed under hard throttle do this? im just doing some backyard driving, so its high-rev, slow speed driving. after i wait for maybe 5 mins, the motor starts bac up.
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Old 05-26-2010, 06:09 PM   #2
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high rev ,low speed sounds like overloading the engine,you might be overheating the motor. check to see if there is any fuel in the lines when it shuts down.
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Old 05-26-2010, 06:20 PM   #3
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high rev ,low speed sounds like overloading the engine,you might be overheating the motor. check to see if there is any fuel in the lines when it shuts down.
it gets to around 260 i believe and restarts around 230. sometimes i see a few tiny bubbles in the fuel ine but nothing major
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Old 05-26-2010, 06:38 PM   #4
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Had this problem with a brand new T-maxx 2.5. I just richened the high speed needle a half turn and the problem never came back. The motor was running hot too under break-in conditions.
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Old 05-26-2010, 06:59 PM   #5
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Had this problem with a brand new T-maxx 2.5. I just richened the high speed needle a half turn and the problem never came back. The motor was running hot too under break-in conditions.
nooo i meanive tried richening both the high speed and low speed needle and it hasnt done the trick
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Old 05-26-2010, 07:08 PM   #6
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Try adjusting your idle screw to increase the idle. Maybe when the engine warms up it is idling too low and stalls. If all else fails call Traxxas.
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Old 05-26-2010, 08:08 PM   #7
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Try adjusting your idle screw to increase the idle. Maybe when the engine warms up it is idling too low and stalls. If all else fails call Traxxas.
i also know its not the idle, right before it happens, if i go full throttle it will stumble and it wont have much power at all, and then just stalls, under full throttle at sometimes
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Old 05-26-2010, 08:11 PM   #8
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i also know its not the idle, right before it happens, if i go full throttle it will stumble and it wont have much power at all, and then just stalls, under full throttle at sometimes
Your bottom end is too lean! just richen the bottom end 2 hours, NOT 2 TURNS

and you should be fine
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Old 05-26-2010, 08:18 PM   #9
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Your bottom end is too lean! just richen the bottom end 2 hours, NOT 2 TURNS

and you should be fine
2 hours?
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Old 05-26-2010, 09:42 PM   #10
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think of the screw as a clock. Go 2 hours from where your at or a 1/6 turn. Or jsut go back to stock settings. Take and start up the engine and pinch the fuel line 1mm for the nipple off the engine. Count the seconds it takes to shut off. if its like 12-13 than lean it out. if its 5 seconds richen it up. You want the engine to shut down at 7 seconds. This is only for a cold engine. Than tune your hsn from there. Make sure you have good bottom end with good top end and a clean power band. good luck
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