Engine won't fit...what now?

Discussion in '2-Stroke Engines' started by Keith, Jun 26, 2008.

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  1. Keith

    Keith Guest

    I just received a grubee 48cc 2-stoke kit and have run into a snag. The 2008 Giant Boulder SE mountain bike I bought recently will not fit the engine:


    Unfortunately, it just won't fit. So, I'm using this as an opportunity to build a cool vintage bike :)

    Any suggestions on what vintage frames will work without modification? I plan on looking on craiglist for some cheap "tall handlebar" bikes, but I want to make sure the engine will fit. Are there dimensions that are recommended? Hey, any help is awesome and I thank you in advance :)

    Best Regards,

  2. Check out the picture galleries and the readers rides forum. The answer to that question is infinite.
  3. KilroyCD

    KilroyCD Active Member

    The cantilever frame style will easily accept any of the frame-mount engines. Be sure to find one with the 1 inch tubing, as the newer ones with the larger diameter tubing may require drilling through the down tube to mount the engine. I think that is quite likely to weaken the frame. If you're not quite sure what I mean by cantilever frame, it's the stereotypical Schwinn beach cruiser style. I have a Grubee 48cc on this canti-framed Western Flyer: http://i191.photobucket.com/albums/z21/KilroyCD/My Bikes/ag13015.jpg
    Let us know how you make out!
  4. spunout

    spunout Member

    drilling thru the frame is a TERRIBLE idea.

    what i do, is get some threaded rod of the same pitch as the stock mounting studs (toss those in the trash-ola).
    make them about 2 and 1/2" long. thread those into motor, pry them apart, and drop it into frame. i like to use a piece of old innertube between the sharp edges of motor and frame.
    flatten the front mount bracket a little.
    squeeze the studs together and install the front bracket, washers, and nuts.
    hacksaw off the excess rod.