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Got an 8700 with an 8620 set i picked up cheaply back in june. The motor's axle cross was missing and someone had jammed a tiny nylon gear on it akin to a remote control car or electric slot car. This was more than a tad useless so i took to the gear with a sharp blade and trimmed it to suit a technic bush or gear. Seems to work ok and once i had tested the switch and wiring to the motor with three precariously mounted AA batteries, i procured some C sizers and thought i'd have a play. Following pictures are video links if clicked upon. Initial testing. Spooling up a flat 6 i made from the remnants of 8850. Impressed with the available revs. The thought of motorising 8860 as by the instructions seemed bloody awful to me. Reinstalling a radiator fan on top of a motor with nothing to drive it and losing those wondrous pistons just wasn't my sorta thing. Built an easily removable motor mounting setup out of my limited spare plates and added a few cogs to let it all gear down. 1st, 2nd, and third speeds in the trans equate to 810, 486, and 162 revolutions of the electric motor respectively to a full turn of the rear wheels. First to admit its far from fast but comfy this way as that gorgeous boxer 4 cylinder stays put and functional. Would be quite simple to remove one of the 8:24 gearsets from the primary reduction for more speed but those pistons take a fair bit of pushing and i'm lazy enough to leave it as is rather than having it buzzing round the room at three times the rate it does now. Placement also doesn't hinder rear wheel traction.