Hi guys,

I've got a 1992 MC21 and I've noticed on the left side at the lowest point of the exhaust pipe there is a small trickle of what looks to be oil. I followed the trail up to where the pipe goes and it seems to be coming from something directly behind the gear shift lever. I shined a bendable light up in there and I saw a fresh droplet of (something) on whatever assembly is behind that lever. It's really hard to see. Does anyone know what would leak (only while the engine is running, BTW) that would track down the left exhaust pipe? Obviously a seal, but a seal for what? Clutch? Crank?

Also, I'm in St. Louis...does anyone know of anyone in the area that works on NSRs? I do a lot of the work myself, but it would be nice to have a local contact when I need help.

Thanks.

By the way, this site is awesome.

Sounds like the shifter shaft seal, output shaft seal, GPS seal.
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Shift shaft seal is the likely culprit

Thanks for the replies, everyone. Upon further inspection this morning, it looks like it is coming from that shaft assembly. One of those seals in there is the culprit. I was hoping, as one person suggested, that it might be melted chain wax, but the smell gives that away. That and this is a thin, light brown oil that doesn't smell like popcorn butter like chain wax does.

The Honda manual would recommend draining the oil, pulling the R. cover off, then the clutch, then the splash guard. Pull out the shaft and then change the seal.

Sounds like a long boring job.

If you're cunning you can change the seal without pulling the motor apart, or even draining the oil.

Lean the bike right over on it's side so that the oil drains to the right side of the gearbox. Get a couple of those handy picks (little pointy things), and you can dig the seal out and just pull it off the shaft. Be super careful not to scratch the seal housing. Then just pop a new seal in and tap it into place.

Recently I wanted to skim 0.5mm off the little steel bush that lives in the primary driven gear assy on the SP clutch. Normally you'd have to pull off the whole clutch assy, then the side cover etc. Lots of messing around. Using the above method (or a similar one) I just whipped off the clutch, dug the seal out, sorted the bush, and it was all back together and running in half an hour.

Cheating I know, but a couple of quid for a seal is less than I'd have charged for pulling the side cover off, new gasket and what have you.

Go the long route if you want to know the inside working of the mission, but if jobs like this bore you then cheat.

St. Louis USA ? Alot of NSR is around by me now . MN, Michigan and you sounds like a group ride will be nice