Originally Posted by bmwktmbill
Take a good look at your oil.
You wll get bubbles in the coolant if the waterpump seals are shot and the valve guide seals and guides are also shot.
I've worked on quite a few bikes , cars, etc. Have a pretty fair working knowledge of how motors work but cannot figure out how bad valve guides/seals could continue to a bubbling radiator? Not questioning your knowledge just looking for some enlightenment.
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