Honda CB1100 Rough Idle Solution

[1973cb750]

my software cant reflash a say "a23" to the "a24" with out corrupting it im pretty sure they have different firmware inside im sure honda has some cool programs to flash them though

[Wisedrum]

If im not mistaken*, in Europe, there was an official reflash of the ECU available to cure the problem. It was never offered or made available here in the states, so our only resort was to buy and replace the ECU with an ECU with an updated part number.

You're right, ferret. My idle problem was cured by a new injection software programm by Honda. I had to 'step on their feet' to get it but it worked and I got it without paying money for it. But it took a while.

[dave]

I tried real hard to get Honda USA to upgrade my ECU, but they refused. They told me it was illegal for them to modify anything related to the emissions system.

[Razor]

I had the rough idle and a surging idle about 2yrs ago. Found a couple of the rubber intake runners were leaking (vacuum leak). Snugged up the clamps, and all was good.

Arrows show the four clamps. Good luck.

[peterbaron]

This is what I like, DIAGNOSES, not blind parts replacement!!
Good job

[rickcb]

I had the rough idle and a surging idle about 2yrs ago. Found a couple of the rubber intake runners were leaking (vacuum leak). Snugged up the clamps, and all was good.

Arrows show the four clamps. Good luck.

Razor, thank you so much for your timely post. All of my clamps were very loose and made the bike run lean when hot, which made it surge at small throttle openings and drive me crazy. Also sometimes the idle would drop to 800 rpm when hot. After tightening the clamps and taking it for a 90 mile test drive, it is running like new.

[the Ferret]

Good deal Rick!