I bought a set of the refurbed carbs from ducatiman early this month. We used them this past weekend at Jennings Endurance Races. Friday all day practice. Two 2 hr. Races on Saturday then a 5 hr race Sunday. The Ninjette ran great all weekend with ducatiman's carbs. All we did was change the main jet for the exhaust we were running. Highly recommend! Thanks Ducatiman!!