10-07-14, 06:24 PM
Sounds like a needle jet leaking.
It either has dirt on the needle valve set or the needle jet housing O ring has perished and allow fuel to leak past and overfill the float bowl and flowing into the cylinder. Since it is much thinner than oil it flows past the rings into the sump. Was a bit of a problem in the earlier 1998 Fazer, but also effects any that are idle for long periods. It can also be caused by someone removing the needle jet housing and damaging the O ring.
The plastic pipe from the drain hole may or may not show it up depending on how fast it is happening.
I would suggest you buy a float valve kit and fit it. They are available from WeMoto for around £16 each.
http://www.wemoto.com/bikes/yamaha/fzs_6...valve_kit/
It either has dirt on the needle valve set or the needle jet housing O ring has perished and allow fuel to leak past and overfill the float bowl and flowing into the cylinder. Since it is much thinner than oil it flows past the rings into the sump. Was a bit of a problem in the earlier 1998 Fazer, but also effects any that are idle for long periods. It can also be caused by someone removing the needle jet housing and damaging the O ring.
The plastic pipe from the drain hole may or may not show it up depending on how fast it is happening.
I would suggest you buy a float valve kit and fit it. They are available from WeMoto for around £16 each.
http://www.wemoto.com/bikes/yamaha/fzs_6...valve_kit/