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. Of coarse you could have some other kind of issue going on, but chances are it's one of the two things I mentioned. It isn't hard or expensive to fix these issues either. These are two very common problems on the smaller displacement Honda Atc's/Atv's /Motorcycles. I'm pretty sure the top ends on the first gen Atc's/Trx's are the same.Īlso, there's a good chance that your Atc has either a broken shift drum stopper arm, or a bent/broken shift shaft fork. Also the 85 Atc electrical system produces more power. 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). 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 the complete engine of the 125m but something is messed up in the gears and don't feel like tearing into it. 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. Is the bottom end/crankcase the same on an ATC 125m as the Trx125? Will the side covers bolt holes and such match up. The 1987 year model is even harder to find, once thought to not exist at all. This sad fact explains the very low production numbers of the redesigned ATC125 model. Sadly these refinements came not even a year before the consent decree fell into place halting production of the ATC line up. 19 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. 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. 1983 ATC250R Specifications 1985 ATC250R Specifications Useful Tools. Length, horsepower, torque, electrical specs, we have it all. The ATC125M introduced a front wheel drum brake, electric starter including a battery, air box refinements and several other smaller improvements. Detailed specs on the Honda 1986 ATC250R atv. 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. Last edited by dougspcs 04-30-2013 at 01:51 PM.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. Then repeat the compression test.a sudden jump on the second test, say 20-30 pounds is a definitely a problem.Īn ATC90 running on 70PSI.I say is impossible! I'd sure want to see the numbers on a properly calibrated compression gauge to believe that! Until then I say it's fiction. Use your compression gauge and get your engine compression, then shoot a small amount of oil into the cylinder and slowly turn the engine over a few times. One old school method to gauge how much compression is lost due to ring wear is simple. If the numbers are even 30-40psi below spec a whole list of issues can result from smoking, to difficulty starting or getting a regular idle. True an engine will run at a considerably lower compression but run well is another story. Those who suggest that significantly lower numbers are fine are only fooling themselves or wanting to avoid the repair. The factory spec is different for each machine.the 200cc Honda is 156+-14psi, the 110cc is 177+-psi.
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