CB450 Jetting For Pod Filters | Reading spark plugs

[@wandoom]

Hello Mr. Skipshift, thank you for your video. Is it possible to tell us what size of main jets you end up? I am chaseing my Honda CB 450 S 1988 carburetors to run with pods and straight through exhaust with no silencer. I found that i should use 132-140 main jet. I will be very happy if you can point me to the end of this process of jetting Thank you for answer

[@Skipshift]

Absolutely! I settled on 40 pilots, 95 mains, and 125 secondary jets. I do get a little decel pop from time to time, so I know the pilot is not spot on, but it's close enough to keep from popping 90% of the time. Also having pretty free flowing exaust compared to stock doesn't help with the pops either. It may not be dead on for your 88 since I believe those have a single main, but maybe it'll be close enough to get you started. I think a 130-135 single main would be pretty close. Hope that helps!

[@wandoom]

@@Skipshift Thank you very much for quick answer. Iwill start with 40 Pilot and 130 main jet. One more question, i am new with honda/keihin acceleration pump and just wondering how will be pump reacting to pods and mufflers.

[@Skipshift]

@@wandoom The pump will still be plenty. In very few cases it would stumble a bit. if the pump shot is too lean you can swap the leak jet that lets the pump "leak off" pressure back into the bowl. But most of these older machines don't need that kind of tuning. Only when you get into flat slide/FCR carbs will that ever really be needed. I think those jets will get you close, at least close enough to read the plug and tune it in from there.