SOHC.co.uk Forums > CB750

How do bikes know when to break?

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MarkCR750:
I've done about 350 miles without issue , tomorrow I'm booked in for a dyno fuelling run, I start the bike tonight and it's running really rough, a quick feel of the pipes says No1 cylinder isn't firing, or hardly firing, all I've done in the last few days is take the carbs off and put them back on, and adjust the mixture screws, when I put the carbs back on No2 carb overflowed, I gave it a few taps with a screwdriver handle and it stopped overflowing, so I guess it was a sticking float/float valve, I had turned the mixture screws in a bit yesterday so just now I turned the No1 screw out half a turn, then tapped the No1 carb in case the float/valve was stuck and not letting fuel into the bowl, it ran rough for about 30 seconds then after giving it a few revs it's running fine and the No1 pipe has come up to the same temperature as the others , how does an inanimate object know to start playing up just when it shouldn't ??🙄, any thoughts on what the issue could have been, I'm thinking stuck float?.

Johnwebley:
its the bikes way of telling whos the BOSS,

Bryanj:
Murphy's fifth law!!

MarkCR750:
Your both totally correct , and Murphy's law also explains the fine weather all week and heavy rain now I'm having to take it 15 miles to the dyno, behold the beauty of my temporary lash up front mudguard! 😀

royhall:
Shame to get it dirty when you've just spent ages shining it up. Dyno results are going to be an interesting read though, as your expecting worse than standard. Its amazing what the standard airbox manages to achieve.  Don't forget to share the results. Good luck.

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