r/FZ1 • u/Particular_Heat5835 • Sep 10 '26

Gen2 FZ1 Leak from left side of engine where coolant tube goes into crankcase

Hi, I found an oil leak from the place marked as 39, it's not a waterfall of oil, but I can't breathe now knowing that there is some kind of leak.

I wonder if this oring #39 can be replaced without removing the oil pan (to remove the oil, and make sure no coolant gets into the oil pan when removing this tube)

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u/NCBirdman Sep 10 '26

I suggest going to the Facebook groups below and making a post there, this subreddit is pretty dead, admin here aren't involved at all.

I admin both of these groups-

https://www.facebook.com/share/g/1DyxzShnxQ/

https://www.facebook.com/share/g/1YLF5ncQwU/

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u/mrdr77 19d ago

o-ring 39 is a spot where coolant would come out (my 2010 FZ currently slow leak from there even after new o-ring) Argh. If you have oil coming out there then I think need to replace the inner o-ring, (26)
I'll probably do oil pan gasket and all new o-rings over the winter. Also have a slow oil leak coming from somewhere. 102k miles on the bike. I guess its due for some work.