Purchased replacement oversize (i.e., from 35 to 38) Pilot Jets for my 1985 Honda CB650SC Nighthawk and they work much better than the stock ones. Nice that CarbJetKits supplied me with Honda OEM Keihin jets. My Nighthawk now starts and idles better. It will rev better when cold and I can ride off with choke in the "on" position after only a few seconds, whereas before it would take at least a minute. These augment the larger set of Main Jets that I purchased from CarbJetKits and installed earlier. My bike is completely stock and running a K&N air filter, albeit performs the same with stock air filter. Bike now starts better and easily wicks up to redline with no problem. Very satisfied with quality and service provided by CarbJetKits.