I've never heard of an NSR pump failing, so has anyone else?
Personally, I leave it on as it's less hassle. Worked fine when I raced the bike, and I never even worry about it packing up. If they were prone to it, then the word on the street would be to go pre-mix...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball