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  1. #1

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    Replacement Magnum pro .21 engine

    I need to replace my Magnum .21 pro nitro engine that blew up on me. I have not been able to find the exact motor but i do need one that will fit the original set-up of that engine.

    Any suggestions??

  2. #2
    nitroexpress's Avatar
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    RE: Replacement Magnum pro .21 engine

    What was the original setup?

  3. #3

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    RE: Replacement Magnum pro .21 engine

    Well, im not really sure what the original set-up was i just know that is it a Vintage Great Vigor Hunter 4wd buggy. Any info would be great! Thanks!!

  4. #4
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    RE: Replacement Magnum pro .21 engine

    You need the old style side exhaust .21 with a short head. Here are a few I found on ebay.

    http://www.ebay.com/itm/Vintage-LEO-...item483d352e7a

    Here is a used one http://www.ebay.com/itm/Vintage-Rc-E...item3a6a36dffc

    Here is a non pull start variant of the same motor http://www.ebay.com/itm/Royal-21-nit...item483d352e27

    If I am not mistaken, these engines are identical to the magnum (which is a clone of the OS SE-B). Personally, I would go for the Leo, these old .21's are getting hard to find. Without modification, you would not be able to put a new style big block in your car. The head would be too tall, the rear bulkhead would get in the way of the header, and the engine itself would be a bit too long.

    Edit: I was looking around after I posted and found a genuine OS SE-B. It's spendy, but it is a proven engine. http://www.ebay.com/itm/O-S-Max-SE-B...item483d352fa8
    Her name was Lola. She was a show girl.

  5. #5

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    RE: Replacement Magnum pro .21 engine

    WOW, thank you very much! I didn't think anyone would have much info on this car. I will look into all of these engines, I like the leo cause of the price and pull start. And It looks as if i could slap my existing parts back on and it would work.

    Thank you soo much again.

  6. #6
    proanti1's Avatar
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    RE: Replacement Magnum pro .21 engine

    Make sure you have the room for the pull start. The heads on these engines are designed to deflect the air passing through them. There were quite a few older cars that used this type of engine, and some of them had a different layout, so not all engines came with the heads facing the right way for specific applications. The head on the Leo would have to be taken off and turned around 180 degrees to work properly, you want air to enter from the front, then move along the gentle curve of the fins. Without the head facing the right direction, these engines overheat very quickly.
    Her name was Lola. She was a show girl.

  7. #7

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    RE: Replacement Magnum pro .21 engine



    yes, your right. ill look tomorrow if the i have room for the pull start, right now i have to use an electric rotary starter. I would i have it would fit.

    Thanks.


  8. #8

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    RE: Replacement Magnum pro .21 engine

    I have 2 of these older vintage motors BRANDNEWINBOX never installed never fired up on the box it says Magnum pro 21/pro FSR-ABC /car

    call me or text me and I can send u some pics 4253876078

    TY
    Robin Green


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