Help! I'm reassembling an MC21 for a friend, but know very little about it. Got the clutch installed and the cover on using an on-line parts microfiche as a guide, but when I fill the 2-stroke oil tank it drains down into the clutch cover. Trying to see how it works, it makes no sense to me at all. Can anybody tell me how the injector pump works and what might be wrong?

TIA,
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"4 bikes is not enough"

There's a little seal on the underside of the 2/ oil pump. If it slips down the shaft the 2-stroke oil tank contents will drain into the gearbox.
Sassy owners leave the tank topped right up as an early warning system of this little beaut.

I think there's a pic of it somewhere (Andy??) but I can't find it.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

Thanks!

That must be item #9 and 10 in frame E 14. I'll get the pump off this weekend and check it out.

eric
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"4 bikes is not enough"

Yep, that's the culprit!!
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

OK, I can't find it on the parts fiche, but I think I'm missing a piece. Not only do I not have the o-ring and washer #'s 9 & 10, I don't have a shaft to put them on. Is there supposed to be a shaft that meshes with the helical portion of the waterpump drive shaft and goes up the passage to drive the oil injector pump? If so where do I get one? Or should I just run premix?
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"4 bikes is not enough"

yes there is, the shaft can fall out and go missing if you take the pump off as it isn't held into the pump end by anything but the rubber seal. I would suggest a wreckers, only not in the U.S. because of rarity. I imagine running premix would be a pain if you ride the bike alot.
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'87 MC16

Thanks. We'll see what we can do.
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"4 bikes is not enough"

Try Tyga. www.tygaperformance.com These guys know everything about MC21s

Hey guys, he's referring to my bike, I found a site that can help with OEM parts!

http://www.apexleisure.co.uk/NSR250MC21.htm

can anyone tell me the part number for the shaft that the oil pump washer and o-ring fit onto?