Oil Pump Issue

[crappiedude]

I have a 50hp Yamaha. Model unknown....only plate on it says: 50DETO 6H5 412046 It doesn't have the letter to let me know what yr it is. I have no idea of year. Anyway....oil pump is out and I'm trying to replace it....I've hunted and hunted for one with this number on it....6H400 It's my understanding the actual part # is 6H4-13200-00-00 I've found plenty with a number after the 13200, such as 01 and 04 but not with just zeros. I've ordered both the 01 and 04 pumps but they will not fit and I've had to return them. Any help would be appreciated. Thank You in advance!!!

[bajakeith]

ummm...?

is this a 2 or 4 stroke ?? and how do you know the pump is bad ?? meaning if f-stroke a engine oil pump or 2 stroker the oil tank pump ???