Topic: 75 CB400F exhaust sound question

[krksquared]

My 400F runs great. I've learned to stretch my rides out because I hate for them to be over. One thing I've noticed is that coming down under compression, I get a mild popping, crackling or barking sound from my exhaust. Kind of like a car with open collectors. My exhaust is stock. My 71 SL350 doesn't do this (I realize it's a totally different engine). This is not a complaint. Just curious if other 400F's do this too. I don't know of any other SOHC4's in my area to compare to.

[markreimer]

Mine doesn't at all. Neither does my 750. But it did take some very finicky carb tuning to eliminate it. Usually a tiny idle mixture screw adjustment can tune that out. That's assuming the air filter is stock.


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[krksquared]

Thanks guys. Yes my intake is original. I'll play with the idle mixture.

[spotty]

could also be caused by an air leak on the induction side. check all your clamps between the airbox/carbs/engine