Just bought a Honda ATC 125m 1985 runs great but wont go in gear and it smokes like no other and has poor compression. Why wont it go in to gear?


Thanks for all the help

 

The 1984 and 1985 125M transmissions were notorious for broken shifting arms and the tab breaking off the center cases that the arm pivoted from. It's a big problem because there isn't enough there to weld with and new center cases are so expensive.....and almost any engine in the salvage yard is there for the same reason.
Granted,..this may not be your speciffic problem. But it more so likely than any other problem common amongst other Hondas. This problem should have been addressed by Honda when they first shown signs of defective.....back in 1985.
A sure sign of this is a shifter that moves fine but doesnt actually activate anything at all inside the transmission.

 

i have a 85 125m, mine wont shift unless full throttle and high speeds 2-4th. its in good cond,i changed the subtrans but has small oil leak on the top ,i tightin the top right bolt a little to much,but its runs...wish i could sell

 

hey thanks <span class="FTHighlightFont">knows alot </span ft> put oil in it and now it is shifting a litile better. O now it wont start dont know why all it will do is backfire im stuck. will starting fluid do the trick? My yz wont even start enless it has starting fluid. So do u think starting fluid will do the trick?

 

could try?? [img]i/expressions/beer.gif[/img]

 

ILL TRY WILL CARB AND CHOKE CLEANER WORK AS STARTING FLUID IDK IM JUST TRYING TO GET THIS THING GOING

 

yeah i mean it could mean alot of things i have the same problem with a bike i have,try taking the carb off soak it in parts cleaner,pull the jets out run a wire ect. and clean the dirt out,just clean it reallly good and try that

 

if you dont know how to pull the carb apart let me know,i rebuild at least 3 a day at my shop

 

your a mechanic i am so to well try to be the best i can i am 15 i took the carb apart a long time ago then it fired up and ran for a lil bit (4 hours) then its been sitting ever sense wich is like 6 months. just trying to get it going again i am going to try starting fluid tomorow after school and if that dont work i am just going to ride my yz80. hell i got the atc for a cheap price ($30)
so i aint agruing about that

 

damn $30?? well dont spray to much starting fluid in the carb,its easy to lock that motor up. just spray a little and try cranking,i think your carb need a rebuild.It very simple to clean the jets, take the bottom part off called the bowl. you will a float,dont mess with it, but make sure it "bounces" and returns.You will see in the center two jets,one with have a flat head slot, and one with take plyers or a 8 or 10mm box end wrench. put those out and use a wire and clean in the inside and the little holes on the side, you should be able to see right through the jets, do the same to any other holes in the carb but be careful,dont use to big of wire and do not drill it out. the starter fluid wont do nothing for it unless its clean.