The ATC110 maintained its 105cc engine for several years but it was only inevitable that the middle sized hard tail was destined to evolve yet again. In 1984 Honda once again bumped up the displacement of their horizontal atc90 engine to a whopping 124cc! The modest engine size increase was also accompanied by a slew of rider comforts. The ATC125M introduced a front wheel drum brake, electric starter including a battery, air box refinements and several other smaller improvements.
Not well known is that fact that the ATC125M was produced as an ATC90 variant until 1986 when Honda was just upping the ante with their ATC lineup. 1986 and 1987 ATC125M's where fashioned to resemble the ATC185/200 models with a vertical up-swept engine, a more rigidly constructed frame, and a body styling which reminds most of the 1986 200x. Sadly these refinements came not even a year before the consent decree fell into place halting production of the ATC line up. This sad fact explains the very low production numbers of the redesigned ATC125 model. The 1987 year model is even harder to find, once thought to not exist at all.
New guy here, this thread seems to be pretty deep, but I'll ask anyway. I got an 85 125m in very rough cosmetic shape, but great mechanical. Electrical has issues. SOOOO, one post up mentioned trx125 and that opens up the question for me. Will the rear fender and seat off a 1986 trx125 fit on my 1985 atc125m well? I'm ready for bolt hole locations being slightly different. Thanks for the help. George
Is the bottom end/crankcase the same on an ATC 125m as the trx125? Will the side covers bolt holes and such match up. I have a re-bored top end from an atc125m that I'd like to put on the bottom end of a trx125 but the left side cover is missing. I have the complete engine of the 125m but something is messed up in the gears and don't feel like tearing into it.
Is the bottom end/crankcase the same on an ATC 125m as the Trx125? Will the side covers bolt holes and such match up. I have a re-bored top end from an Atc125m that I'd like to put on the bottom end of a trx125 but the left side cover is missing. I have the complete engine of the 125m but something is messed up in the gears and don't feel like tearing into it.
The bottom ends are different(think the clutch cover is the same though), at least for the first generation 84/85 Atc125m's and 85/86 Trx125's. I have both an 84 and 85 Atc125m; the engine stuff is basically the same except the 84 is a 4 speed (all down), the 85 is a 4 speed (all up). Also the 85 Atc electrical system produces more power. I'm pretty sure the top ends on the first gen Atc's/Trx's are the same.
Also, there's a good chance that your Atc has either a broken shift drum stopper arm, or a bent/broken shift shaft fork. These are two very common problems on the smaller displacement Honda Atc's/Atv's /Motorcycles. It isn't hard or expensive to fix these issues either. Of coarse you could have some other kind of issue going on, but chances are it's one of the two things I mentioned.... Was your Atc missing shifts and or slipping out of gear? If so, I would take your clutch cover off and check out the shift drum stopper arm and shift shaft fork.
7 CommentsThe ATC110 maintained its 105cc engine for several years but it was only inevitable that the middle sized hard tail was destined to evolve yet again. In 1984 Honda once again bumped up the displacement of their horizontal atc90 engine to a whopping 124cc! The modest engine size increase was also accompanied by a slew of rider comforts. The ATC125M introduced a front wheel drum brake, electric starter including a battery, air box refinements and several other smaller improvements.
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