Searched this and looked at some of the threads. They all seemed weird to me. So I bought a HMF Competition Slip on recently (the deal was to good) and HMF said the recommended jet is 170 with the lid off, K&N and snorkel removed. That seems too rich to me. Now with the snorkel and lid removed, and K&N Filter, sitting at about 760ft above sea level, does 170 sound reasonable? Some people say it does but I picked up 150,152,155,157,,160 jet sizes to start with. wondering if I should buy more? any help is appreciated.