Engine mount question

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  • #42379

    I know this is a shot in the dark, but I’ll try it anyway:

    Rotax 125 mounted on Birel kart. Engine mount has two hex screws I need to loosen to move the engine forward or aft. (Don’t know who made the mount.)

    Problem: hex screws appear to be either 7.5mm (or SAE equivalent), i.e., 8mm is too big and 7mm is too small.

    I cannot locate a 7.5mm hex socket.

    Any idea what size this is supposed to be? Or, if it’s 7.5mm, where I can find a socket for it?

    Thanks for your suggestions.

    Jason Benoit

    you could always try a 19/64. It’s roughly 7.5mm


    It’s possible that the heads of the hex screws have been worn down due to track contact. You may have to force the 8mm hex wrench in with a slight tap from a hammer to make it fit.


    Good call. Against the usual “don’t force it” advice, I gave the 8mm a whack or two and it did fit.

    Thanks for the suggestion!

    Garrick Mitchell

    LOL… Been there, done that. I came this close to having to drill my engine mount bolts out due to prior curb strikes, but with persistence (dead-blow hammer, then using a pick to pry out excess metal in the hole) I managed to get a hole an 8 mm hex could fit in.

    Now, that’s just one more thing I check before each run. So far, I seem to give the curbs a wider berth than the previous owner. It shows in my lap times. 😛

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