Ian, you will find that the 70 engine will not be a direct bolt in to the ST90 frame. The 90 had a larger engine block than the 70. The many brands of Chinese engines out on the market now that are clones of these Honda engines use the smaller 70 size engine block on displacements up to 140cc and possibly more now. Engine mount adapter kits are available to bolt these engines into the larger 90 style frame mounts. Thus you could buy these engine mount brackets if you chose to mount your 70 engine in the ST90.
Re: Honda mini bush bikes (pics)
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