Help getting Traxxas Nitro Sport running?
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  1. #1
    R/C Newbie JP147's Avatar
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    Help getting Traxxas Nitro Sport running?

    Has electric starter, new glow plug that works, working glow plug glower, fuel is getting to the carb, but still won't start. It runs a bit while the starter is turning it, and occasionally will run for a while without the starter. It stops after a few seconds though, or if i open the throttle.
    If I lean out the low speed needle slightly, it doesn't start at all. If I have it 1 3/4 turn out, like in the manual, it works the best, but smokes and cuts out.
    Does anyone have any suggestions on what to try?
    Thanks

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  3. #2
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    towie964's Avatar
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    How old is the motor (how much fuel has been through it)

    has the engine been punished or well treated

    What glo plug is it running?

    What % nitro are you running through it?

    Have you checked to ensure no air leaks?




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  4. #3
    R/C Newbie JP147's Avatar
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    It is an old car I bought for cheap, the motor it had in it didn't last long, but it came with a "good" spare, and I put that in. I don't know what it has been through.

    Glow plug is a Traxxas "Super Duty Long Glow Plug"

    16% nitro fuel

    The exhaust was leaking, so I put a hose clamp around it and I don't think it does anymore. The underside of the engine is moist but not dripping.

    Thanks

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  6. #4
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    The glo plug you are using is the wrong one, the Part number for the motor you have is a Traxxas #3230, the plug is slightly shorter and has a very pointed top pin to it.....

    The motor may have a leak around the front bearing seal or the rear plate causing the moisture, this can cause some of the problems you are having, a leaky exhaust can also cause the issues.

    You will need to ensure the seals are all doing their jobs. 16% fuel will be fine.

    I have included a link to the Traxxas website Glow plug section so you can compare the plug you have to what you should have, it also gives some good pickies of what the plugs should look like when they are in good condition

    Hope this helps you get it running

    http://traxxas.com/support/Glow-Plugs




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  7. #5
    R/C God Pro.28Avenger's Avatar
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    was the spare in a sealed bag, or just left floating in a box with other spares with no cover over the air intake and fuel inlet? If so the carb and combustion chamber could be full of grit that will cause damage and stop it from running.

    What condition are the fuel lines in? Only takes a pin hole to have a negative effect

    You said the exhaust coupler needed a clamp on it, is there a pinched area in it that could be allowing air leaks, or did the clamp split the coupler?

    Before you put the spare in did you check the compression? Put a glow plug in and hold the motor by the flywheel so that the motor is horizontal. If it stays where you turn it to it has good compression, if it falls so the head is pointing to the ground the piston/sleeve is stuffed.

    Without seeing the motor and hearing what it is doing it is hard to diagnose, we can only give rough advice. Where are you located, there may be someone close to you that can help you get it running
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  8. #6
    R/C Newbie JP147's Avatar
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    Thanks, that is very helpful. I have the right glow plug, the fuel line is good, and the exhaust seems to not leak. While trying to find the leak, I noticed that the side of the block was moist, and it turns out there was one bolt loose on the head. The head is slightly warped, but I have a spare from the broken motor so I will see how that goes.

  9. #7
    R/C Newbie JP147's Avatar
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    The head is fixed, but the sealing surface on the engine is slighly dented, so it leaks from there. Any suggestions?

  10. #8
    R/C God Pro.28Avenger's Avatar
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    whats the same surface like on the dead engine? If its in better condition than the one on the running engine, swap over the piston, sleeve, crank, bearings, carb and every other part from the running motor into the block of the dead engine.

    failing that, there are 2 options
    1. its time for a new motor am sorry to say, as you cant machine it down without changing the compression, risking the piston hitting the button and damaging parts more and removing the chance to to use them for spares in a new motor.

    2.Get some liquid gaskit/heat resistant silicone and seal the join between the cooling head, button and block... but it wont last for to long and you will be back to choice 1
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  11. #9
    R/C Newbie JP147's Avatar
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    On the dead motor, some of the bottom of the piston broke and jammed it. It seems not to bad, except for some scratches where the bottom of the conrod scraped metal shavings along. It is also full of metal shavings, but I will give it a go. Thanks for the suggestion.

  12. #10
    R/C God Pro.28Avenger's Avatar
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    if the block on the old engine is damaged, dont waste ya time just get a new motor, sounds like the person selling it knew the motors were stuffed and thats why they were selling it
    Only Aero based now, mostly multi rotors and FPV Turnigy Talon-X, Scratch Built Tri, Scratch built Deadcat
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  13. #11
    R/C Newbie JP147's Avatar
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    I have put a motor together out of the 2 bad motors I had. It starts up easily and doesn't stall, but it runs too rich. There is a lot of fuel coming out of the exhaust, it makes lots of smoke, accelerates slowly and hardly has power to engage the clutch and move by itself. I set up the idle, low speed and high speed settings on the carb like it says on the manual. I then tried gradually leaning it out, but it was still slow and spitting fuel out. Any ideas?

  14. #12
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    It is normal for nitro engines to spit liquid from the exhaust...

    Sounds like you may have it too rich still...try leaning the HSN some more...see if it begins to make a difference....the last nitro sport I tuned required some serious leaning to get it to come to life....I think the final setting was 2~2¼ out and flush on the LSN

    What fuel are you running, is the nitro content high enough, could the fuel be old and stale, also what glo plug are you using

    There are 3 different glo plugs for the Traxxas models, 3230, 3232, 3232X....the Nitro Sport (1.5 engine) uses the slightly shorter 3230, the 3232 and 3232X are slightly longer medium heat range plugs for the 2.5 and 3.3 engines




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  15. #13
    R/C Newbie JP147's Avatar
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    The fuel is 16% nitro. I don't remember which glow plug I have, but it is the right one. I will keep leaining it next time I have a go, thanks for the advice.

  16. #14
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    16% should be fine, although if you wanted to...you can step up to higher Nitro % if you wanted to...




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