GT 750 oil sludge coming out of radiator?

[Gman55]

Hi all.
Am a very recent owner of a Suzuki GT750 and have a fairly good knowledge with 2 stroke engines.
The bike starts and runs fine but when I opened radiator to check level it was down. I topped it up and started it to check for other abnormalities and I found oil mixed quite thick with the water starting to push out the top.

Is there a seal or bearing that connects the gearbox to water pump where oil could be sucking through or am I looking at problems with the casings? Checked the gearbox oil but that is all clean.

Any suggestions or help would be appreciated. Thanks

GMAN55

[rngdng]

It sounds like the upper water pump seal.



Lane

[Dougnemeth]

When I had trouble with the water pump on My TS250X I had water getting into the G'Box... The water jacket is pressurised... Just my thoughts.

[Suzukidave]

I wonder if the stuff you found wasnt some sort of stop leak added to the coolant ?

[oldjapanesebikes]

Likely not the water pump - typically coolant would go into the gearbox rather than the other way around. Same for the radiator bypass line seal. It could be a head gasket issue, or as Dave mentions possibly something that actually has been added to the coolant.