https://www.ebay.com/itm/YAMAHA-XS2...e=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649 I have been using these this past season and they seem to work well. With five bikes and the cost of oil changes I thought I would give these a try. Looks like K&N or HI-FLO type but for a low price. Made in china like the others but under another brand but most likely at the same factory. I have seen them sold for cheaper when purchased in larger quantities but this should work for most.