Question about Traxxas Rc Revo Nitro Monster Truck

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Revo spur gear keeps getting stripped

I have changed the spur gear 3 times and each time I change it, it get stripped in a few seconds of use. The initial spur gear lasted 12months and had a significant amount of use. What am I doing wrong?

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Youre not setting the right gap between spur gear and clutch bell. all the adjustment is on the engine side so once you got youre spur gear in place loosly fit the engine. Push the engine close to the spur gear so the teeth interlock. Cut a long thin piece of paper and feed it throgh the teeth.turn the clutch bell around. It should feel the same all the way through the turn. If not push the engine closer if it starts feeling loose or ease it away if it starts feeling tight. the paper should come out the other end with a step pattern. the reason for the paper and turning the clutch bell is even though the teeth are intwined at first, once you turn say 3 quaters of a turn if the engine and transmission is not parallel it can move 3 to 5mm in either direction. Lastly use thread lock on all bolts as the vibration can move these and hey presto you are getting another one. Hope this helps.

Posted on Jul 08, 2010

  • junkmail852 Sep 28, 2010

    I also had this problem. For me, it turned out that two pieces of the engine mount brackets had cracked or broken (too many bad landings), and it was causing the engine to lean forward (this also caused damage to the air filter connector as it was rubbing against the spur gear). Inspect the underside of the car and look for damage on the engine mounts.


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Having problems stripped spur then lost all gears had some one look at it and few adjustments still having problems really need someone to fix but not want to pay price to send car to perth

Posted on Oct 16, 2012


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I took my traxxas t maxx 2.5 to the beach and started it up. It ran well for the first 5 minutes then ran prettly bad. When the t maxx was stopped and I gave it wide open throttle it would barley get up to...

Firstly the engine could have breathed in some sand from the beach thus causing the lack of power , it could also be that the glow plug requires changing too, this is a common problem on nitro cars, especially when the engine gets too hot and doesnt get much cooling. Reset to factory settings on the carb(see your manual or download one) then restart , also make sure you are using the correct fuel , it must be 20% nitro. Lastly for the replacement from 2.5 to 3.3 yes you can do it . all you have to do is unbolt the old 2.5 replace with the 3.3 plumb in and wire is as before , check the messing on the spur gear. though be cautious not to over rev the engine as you will strip the spur gear.

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