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  1. #1
    RC poster
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    Oct 2012
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    Question tmaxx 4909 engine 3.3 SPUR GEAR ISSUES

    So i got a tmaxx 4909 with the 3.3 i used it a few times and it ran ok untill the last time i got it run right. What happened is it rolled over and the engine reved really high. I flipped it upright and gave it gas and it didnt move. The spur gear was toast.. So i put a new one on nd tighted it up ( this is all new to me so i didnt know it should be loose on the clutch) i started it up and it went about 10 feet and the gear stripped out again. The truck wants to take off the minute it starts ( is there no neutral ? ) it also seems like it is reved wayy to high from the start. So this last time i put a new gear on looser but still had some tightness to it. It started up in its really high rev like always i gave it gas and it went but seemed like the gear was spinning way wayy to much. So i need help trying to fix the whole spur gear thing and why it sounds like its gona blow up when i start it from reving so high. The engine is stock i do however have a aftermarket metal pipe on it that is much bigger then the plastic ones. I am open to all advice as i have no clue what im doing... Thanks in advance !!

  2. #2
    RC Qualifier
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    Sounds like you idle is too high and I hada problem without gears in my4910 and I never noticed but my motor mount would loosen up just enough the slide away from the gear check your gear mesh and turn the idle down and retune
    drive it like you stole it

  3. #3
    RC Turnbuckle Jr. Wildman4910's Avatar
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    First I would check your throttle linkage for bends &/or trim holding the carb open.
    At idle/or on the brakes on the transmitter you should have about a 1mm idle gap, you can check this by pulling the air filter off & looking into the carb throat.


    If it's lager then 1mm, you can use 1mm(#60 or #61 will work too) drill bit shank to get the gap size right by adjusting the idle gap screw.


    If your throttle linkage/trim/idle gap is good then you need to tune it.

    Tune it warmed up, fuel at half tank, w/a clean air filter.
    Tune it HSN, then LSN(3 second pinch test), then HSN again if needed.

    Two good reads on tuning below.
    http://traxxas.com/forums/showthread...70#post2451270
    http://www.extremercmods.com/content/tuning-popup.html
    Last edited by Wildman4910; 10-16-2012 at 01:56 AM.
    Look out for the tree/crunch!

    LiPo? Naw NITRO!!

  4. #4
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    Join Date
    Sep 2012
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    I would also take the air filter off,and check your radio to make sure your servo trims arnt messed up like how much the carb is opened when you turn the radio on,and your gear mesh is deffiantly loose if its just stripping gears like that check the screws underneath for your moter mount this guy on youtube we'll help in this short vid if your not familar with setting your gear mesh

    http://youtu.be/73xlmyk0K_U

  5. #5
    RC poster
    Join Date
    Sep 2012
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    15
    Quote Originally Posted by Wildman4910 View Post
    First I would check your throttle linkage for bends &/or trim holding the carb open.
    At idle/or on the brakes on the transmitter you should have about a 1mm idle gap, you can check this by pulling the air filter off & looking into the carb throat.


    If your throttle linkage/trim/idle gap is good then you need to tune it.



    Tune it warmed up, fuel at half tank, w/a clean air filter.
    Tune it HSN, then LSN(3 second pinch test), then HSN again if needed.

    Two good reads on tuning below.
    http://traxxas.com/forums/showthread...70#post2451270
    http://www.extremercmods.com/content/tuning-popup.html

    Didnt Notice your Post lol

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