Check this thread out, looks like you have the right part number.
alvis and I did it back in June and its a great improvement for highway travel, with almost zero loss of power at the lower end. Plus it makes your speedo nuts on, but your odometer reads about 6% less.
Your real gas mileage will improve slightly, but because your odometer is now reading low-your perceived looks worse-but it didn't.
alvis and I actually did it twice, first time we got the sprocket without the rubber flanges, decided the extra was $$ was worth it for the rubber bits second time round.
You'll need a big breaker bar, or preferably a impact wrench to get the damn nut off-most were way overtorqued when the bike was assembled.
After trying 16/46 sprockets (6.66% over 15/46 stock), some of us went to 15/44 (+4.54%) instead for a better overall gear ratio. I'm actually switching to 15/45 with a taller 150/70-17 rear tire, for a resulting ratio close to with a 160/60-17 and 15/44 sprockets...
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