SOURCE: 2000 YZ 125 Breaks up at High RPM
check fuel float level as it might not be able to keep up the flow rate at those revs
or the read valve has become weak
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 water pump seal
GET A SMALL SCREW DIVER IN BETWEEN THE SHAFT AND SEAL PRY IT OUT WITH OUT DAMAGING THE SHAFT THEN USE A SOCKET FROM A TOOL KIT THAT FITS PERFECTLY AROUND THE EDGE OF THE NEW SEAL TO HAMMER IT BACK IN
SOURCE: new piston break-in procedures for a yz 125 2
let the bike idle for the first min or so then give it a few quick burps on the throttle let it warm right up to operating temp then drive it go through the gears nice and easy first couple times after that you should be able to start opening it up and riding it like you normally would.
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SOURCE: leaking oil from power valve on 2000 yz 125
It is normal for the powervalves to leak, but it does depend on where it is leaking from.
The hose on the left side is the power valve chamber vent - it is normal for it to leak thick black oil from this hose.
If the leak is on the right side, and the oil is transmission fluid, then the seal on the actuator shaft needs to be replaced.
Excessive oil from the powervalve hose is a possible sign that the compression is low. Low compression equals lower exhaust temperatures and this can lead to incomplete combustion.
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