Guys, I want to start of by saying sorry, because I know this topic has been beat to death, but I could really use some help on jetting my carbs. It is 75 CB750F. The bike has pod filters on it and I'm NOT going back to airbox on this bike. Just wanted to get that outta the way. It also has a custom 4-1 exhaust. Used the stock header all the way back to the pipe though. The carbs are currently at stock setting, but I am just looking for a direction to go. I rode the bike as is for about 2 weeks before winter. I just put some tape around the filters because I wanted ro ride it instead of tinker for what was left of summer. It ran pretty darn good , but not perfect. Either way, I knew it would need jetted properly. A couple days ago, I went out to start it just to remind her that I knew she was there. FAIL. Put new plugs in and got it going. Weird part to me is that the plugs were black. I figured the bike would be lean if anything due to the pod filters. Anyways, I then got it running how it was during the summer, or so I thought. It ran good for the day. I tried to start her again today, FAIL 2. It actually started but would not stay running. After choke, unchoke,throttle, blah blah blah for 5 minutes, I just let it die. I then came in to do some reading and saw a guy with a formula he swears by. ( I know each bike is different, but it is supposed to get you started) Anyways, by his formula, I would be going up 6 sizes on mains and 2 on pilots. A) Does this seem extreme? B) wouldn't black plugs mean I need less gas, not more? Needle position need changed too? Any help leading me in the right direction would be awesome. Also, should I move to a hotter plug? I realize it is the middle of winter, but I'm actually looking at selling the bike. Whoever buys it will possibly need to jet it again, but I just want to know it's leaving here running well. I'll let you gurus have the floor now. Thanks.
I have a 76F with pods and a very open 4-1. With roundtop carbs I'm running 125 mains and 42 pilots and needles in the very middle position. Runs flawless except for very cold ,windy days. Then I get the famous pod-cross-wind issue.