here is a 29er i built to ride this summer. it has a dax cag engine-the 4.2 hp one, and a left-side freewheel. it has a bmx chain for engine drive. the engine mount is made from an old seat post rack with a piece of steel plate welded on. at the end is a short section of 3/8 threaded rod for the side supports to attach. i got the gas tank off ebay, it's a take-off from a honda gx engine. there are no holes drilled into the bike for this setup, the side brackets are attached with vinyl covered ubolts i bought at lowe's
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