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Makotosun

Leaky oil pump check valve?

  • Cmattina
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Leaky oil pump check valve? was created by Cmattina

Hi all,

I've been recently refurbishing a 1973 RT3 that sat in heated storage for a few decades. 

I'm just wondering if a result of a bike that's sat is for the oil pump check valve to fail with oil leaking from tank into cylinder. 

Looking at the parts parts diagram, it looks like the valve is just a spring and ball. So, would that allow oil to pass from the tank into the cylinder? 

I definitely have fresh two stroke oil at the exhaust header. Is there anything else besides the check valve that would allow oil to pass from tank into cylinder?
27 Oct 2025 05:47 #1

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