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  #1  
Old 12-24-2007, 02:59 PM
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Last Online: 12-25-2007 08:56 AM
Location: Kalamazoo MI
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Default Yamaha yz125 milky white oil

I just bought at 81 yz125, yes the first year they had liquid cooled, known for breaking down (found out after buying). I bought it not running, cleaned the carb up and the fuel screen, and it started up fine. My biggest issues are:
1-when opening the oil fil, I saw the oil on the gearing was a milky white (coolant gettting into the oil?)
2- Engine wont idle-runs fine with choke out but dies when choke is put in
3- Kick start doesnt "grab" all the time, occassionally wont do anything for multiple kicks

Any help would be greatly appreciated as I am new to dirtbikes, but would like to get this running well. Thanks
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  #2  
Old 12-24-2007, 03:35 PM
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Last Online: 10-13-2011 08:28 AM
Location: nothern ireland
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Default Re: Yamaha yz125 milky white oil

hey. milky white colour would mean the presence of water altho if its just a slight grey not white it may be down to condensation. it could be coolant from the water jacket or water getting in through a gasket or seal when washing.
maybe the idle is set wrong or your float needs moved up a clip. maybe just adjusting your throttle slightly to tighten your cable.
and is it the dogs on the kick start shaft are ruined of does it turn the shaft and something inside is doing nothing.
i think what i said is correct but i am only 16 and although i do my mechanicing myself some of the more experienced people on here will correct me if im wrong!
happy christmas
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  #3  
Old 12-24-2007, 04:00 PM
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Default Re: Yamaha yz125 milky white oil

I would change the gear oil a couple of times and see if the milky-ness persists. If it does, then you have a leak somewhere from your coolant, most likely. I have changed milky oil before and sometimes it takes several changes before the oil will remain normal.

Idle--try adjusting your idle. Not sure where it is on that old of a bike, but should be on the carb somewhere.

Kick-start- Might be able to take it apart and re-install, making sure everything is tightened to spec. Could just be something has come loose, but the longer you let it stay that way, the more likely to do permanent damage. It could already be damaged, in which case it will require replacing. (Whatever is loose) Good luck and welcome to ATM.
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  #4  
Old 12-25-2007, 08:52 AM
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Location: Kalamazoo MI
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Default Re: Yamaha yz125 milky white oil

Thanks, I will try and change out the oil, is it normal to have a bit of oil dripping out the exhaust when running rich? The bike sat for 3 months before I bought it so that could play a part? Also does anyone know an easy way to straighten a rear tire? It seems its a bit wobbley (has the adjustable spokes) Thanks again and Merry Christmas!
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  #5  
Old 12-26-2007, 12:44 PM
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Location: nothern ireland
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Default Re: Yamaha yz125 milky white oil

hey your rear tyre could just be the chain tensioners- one could be brought out more than the other making your wheel not alined properly to the swinging arm or on the other hand your wheel could be buckled and i dont know if you can fix this but check the chain adjusters to see if someone has adjusted one more than the other
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  #6  
Old 01-03-2008, 07:21 AM
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Location: Salem, OR
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Default Re: Yamaha yz125 milky white oil

Sounds like your carb needs cleaning or you have an air leak for the idle issue. Check the compression also - make sure the top end is in good condition before you do anything.
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