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  1. #1

    Join Date
    Dec 2011
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    , FL
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    OS .21 TM Engine

    Hi guys,*

    This is my first post here. I hope yo guys can help me out on this.


    I just purchased an OS .21 TM to replace my late TRX 3.3 in my 5309 REVO. I will run it with the supplied revo manifold and the stock resonator pipe. I will also install an ST racing 3 shoe aluminum clutch, and will run 16/36 gears. I have a stock of traxxas 3232x plugs which I will use. I also use byron 20% RTR gen 2 fuel.*

    I have the following questions:

    1)what is the best way to break in this engine? The manual suggest 30 degree s lean turn every tank. I read else where to heat cycle it. Which is better? if its heat cycling, which is the best heat cycling method?*

    Currently the temps are in the 70s during the day.

    2) Shall I seal the backplate and carb neck before running it?

    3) From your experience, is there anything that I need to know about this engine? what to look out for? what not to do? etc..

    Looking forward for your replies...

    Thank you

  2. #2
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    Join Date
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    Champaign, IL
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    RE: OS .21 TM Engine

    You just follow the instructions provided by O.S. Basically, you drive the car, running it up and down at various throttle settings, and gradually work the high-speed needle towards the peak setting. O.S. DOES know about how to run the engine and get it properly broken-in.

    You don't need to do anything else to the engine. If they are properly-installed, the components will be properly sealed. It's when people mess things up that they need to add things to cover the mistakes.

    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com


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