1995 YZ250 water pump question

FWYT
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5/24/2018 8:07am Edited Date/Time 5/24/2018 6:43pm
Hey all,
I'm working on a 1995 YZ250 long-rod resto. I was looking at parts diagrams to order some water pump seals
and the 1995 shows that it uses a pinned impeller and a single, wide seal.


However, in my bike, the pump uses two seals and a bearing, as shown in this diagram from a 1998 model.





My question is- was this a popular mod back in the day? I'd imagine they had to swap on the whole side case?
Or was this just maybe something that a prior owner did if the original side case got whacked?
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kb228
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5/24/2018 8:47am
Id say they swapped the case. They look sooo similar. The new design is way more reliable and allows a weep hole to be added.
FWYT
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5/24/2018 1:52pm
kb228 wrote:
Id say they swapped the case. They look sooo similar. The new design is way more reliable and allows a weep hole to be added.
That was kind of my thought- that someone doing a long rod would also do other mods while they were at it. Just wasn't sure if this was a common thing back then.

The weep hole . . . I'll have to look next time I'm at the shop, but is that something that is already in the '98 case or something I can/should add myself?
kb228
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5/24/2018 2:34pm
Its already in the case. Its by design. Tells you if one if those seals are shot. Otherwise youd never know you got oil and coolant mixing
FWYT
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5/24/2018 6:42pm
kb228 wrote:
Its already in the case. Its by design. Tells you if one if those seals are shot. Otherwise youd never know you got oil and coolant...
Its already in the case. Its by design. Tells you if one if those seals are shot. Otherwise youd never know you got oil and coolant mixing
Thanks!!

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