SOURCE: 1999 yz 125 service or owners manual
www.bikebandit.com and or www.extremepowersports.com
these both have detailed pdf files you can look at.
SOURCE: how do i decode yamaha yz 125 engin id number
You don't decode it. It is only a production run series number. Mororcycles are like cars in that respect. It is the frame number, AKA the "VIN number", is what carries all the information. Call a dealer with the frame number and he can tell you year, paint color, specific model and more. They may have a problem if the bike is too old. Yamaha changed to a newer code system a few years back.
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SOURCE: yz 125 1990 clutch spring diagram
www.bikebandit.com
It's one of the few that has a diagram.
Not sure what you mean by anti-rattle? The springs are for the pressure plate, and allow the clutch to grab, so you can go.
SOURCE: yz 125 bog
Sounds too lean to me or lacking fuel.
Partially blocked jet in carb. May have to remove / clean.
Check also that carb butterfly / piston is travelling to full open position.
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