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Oil pumps not made anymore??? Springs or valves?

Buffalo Bill

Buffalo Bill

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I've been looking at 1980s bikes I like recently and checking on replacement engine parts available for them.
Looks like no replacement oil pumps are available for any 1980s bike, not even the internal parts.
For some engines you can find valves and valve springs, others not.
Anybody read about rebuilding oil pumps?
Replacing valves, valve springs and oil pumps are essential needs for performance engines.
 
The pumps on these motors fail so rarely and there are so many engines parted out that there isn't a demand that could support an aftermarket for them the way there is for gasket and seal sets.
 
While i always check the pump on every rebuild, i've never had to replace any pump part...

Valves and springs, for some time now, it's been cheaper to replace OE with high quality aftermarket. Often pistons are the same.
 
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