Motorcycle Repair: carburation, pod filters, fuel ratios

Question
I have   A 1984 Nighthawk 750 S... Was  considering rejetting engine  and installing individual filters, would it be  worthwhile
in terms of  economy  and power? Is this trial and error type tuning, Or would I be   able to get The  correct jets, first time  around.
Thanks, Frank

Answer
Frank, CV carbs have some tolerance for changes in air filters or exhaust changes, but generally you have to jet up about one step on the mains and drill out the limiters on the idle screws, so you can richen up the off-throttle hesitation a little bit. Most "jet kits" have adjustable needles and larger main jets. You can shim the needle up slightly to enhance the mid-range, as well, but you are using more fuel to make more power.

I doubt you will see any substantial change in performance/economy. Honda spends a lot of time dialing these things in to meet emission controls as well as being a good performer.

And, yes, it can be trial and error. You are changing the intake tract length with pod filters, so it may cause a change in the performance curve at higher rpms.

These are fine, reliable bikes as designed. Unless you have access to a dyno to check the air-fuel ratios and power outputs, you are somewhat shooting in the dark.

Check for Nighthawk forums on the web, which might be able to guide you more accurately.

Bill Silver