SOURCE: 1997 yz 125 wont start, please help
2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.
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: what spark plug for yz 125?
I have a dennis kirk book, the correct spark plug is a --BR9ES--(NGK)
i always used SAE 10w-30 oil on all my dirtbikes,
no transmission fluid
for the chain you should move the back tire back until the chain is at a snug tension
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.
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