The oil pump shaft seal is the most "common" oil pump "failure" on the NSR. It doesn't fail as such, but can unseat from the housing and slide down the drive shaft. This in turn allows the oil tank to dump all its contents into the transmission casing! Not saying the pump can't/won't fail, but in my 30 years of NSR experience, I've never personally seen one fail mechanically.

With that said, the seal is not available from Honda, but I do believe it's a common size on some snowmobiles and jetskis/waverunners, so should be readily available from good reliable sources. Needless to say, use a high quality seal, not some cheap Chinese no-name seal. (Even though most seals are made in China now! 🤣🤣)

I always advise everyone to check the 2T oil tank level before every ride, and to top the tank back up to full after every ride, no matter how short. This way, if the seal moves (it's never been known to move during use, only when the bike is static, i.e. overnight, after a ride) you will notice an empty oil tank before you even attempt to start the motor! 😉

As Sami says, clean the seal housing very carefully. Brake cleaner and a lint free cloth is ideal, and ensure the housing is completely dry before pressing in the new seal. If you're under any doubt about the fit of the seal in the housing, you can use a little smear of RTV sealant on the outside of the seal to help it "bond" into the housing, but it shouldn't be necessary with a high quality seal.
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Andy.
NSR-WORLD.COM

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