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: 1999 yz 125 weak spark won't start
Not much info Smitty but if that weak spark is constant (ie:pulsing ) i would guess that the trigger coil is ok.I'd make a check on your ignition coil earths then do a couple of continuity tests on your coil primary and secondary , orange terminal to ground,orange terminal to ht lead ,if they check out ok according to service manual specs then i'd run continuity test on the source coil.....Hope this is helpful in someway ...Smittycat.......from Flabbycat
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.
Can I get a “very helpful” rating on this answer?
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: what is the easiest way to change my shifter shaft
Remove gearlever,drain gearbox oil,drain coolant,remove powervalve actuator cover,place small allen key in slot provided & remove bolt on actuator,remove radiator to waterpump hoses,remove clutch cover,slide shaft out from left to right,(If clutch hub is in the way remove clutch assembly),fit new shaft ,reassemble,replace gearbox oil & coolant & bobs ya uncle.
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