Vintage Dirt Bike Q & A

Where might I find a factory service bulletin for a 82 Yamaha yz 125?

Yamaha used to put service bulletins and service data in their parts page.i had not seen any on the bikes i have but they used to be there,there might be on your bike.
http://www.yamaha-motor.com/sport/myyam ... there.aspx

there is also a place called Powersports Plus and they usually have specs in the parts lookup on it,i found many specs needed for a 1978 DT175 before i later got a official shop manual.

here is a link to this page,if you want OEM parts just click the components tab in the page.
http://find.powersportsplus.com/?q=*:*& ... 22YZ125%22

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(2) 1968 DT1 1970 RT1M,1970 DT1C 1971 RT1B Enduro 1974 MT250 1974 DT250A (2) 1975 DT400B 1974 DT100,1978 DT175
1975 CR250M1 1979 CR250R 1979 Kawasaki KZ400H1 Jesus is Lord!!

might give this place a try too.they do have specs and data there and possibly TSBs as well.
http://www.cmsnl.com/yamaha-yz125j-comp ... partslist/

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(2) 1968 DT1 1970 RT1M,1970 DT1C 1971 RT1B Enduro 1974 MT250 1974 DT250A (2) 1975 DT400B 1974 DT100,1978 DT175
1975 CR250M1 1979 CR250R 1979 Kawasaki KZ400H1 Jesus is Lord!!

Thanks Dave....I'll give it a try!