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CB550 F2 Misbehaving...

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Steph550:
Hi all,

After being very well behaved for a long time, my 550 F2 has decided to start misbehaving! Basically, the bike has started cutting out at random moments while I'm riding. It seems to happen mainly when I've ridden somewhere, stopped for a cup of tea, then ride off again when the bike has cooled down a fair amount (say after being parked for half an hour). Up until just now, it only seemed to be happening when I let the throttle off completely, but it's just happened while cruising at 70mph on a dual carriageway so that's thrown that theory out the window! :-[ There's no warning at all, no coughing, just a sudden complete cut out. The bike also sometimes takes a while to start again afterwards so may be fuel related? Electrics all still work at the time of the cutout.

Has anyone experienced similar symptoms at all, or have any ideas what may be causing it? I replaced the fuel filter and checked the fuel tap last year, so I doubt that's the problem, although I won't rule it out.

Or maybe the 550 is just jealous that I've got a second bike! ::)

Any ideas would be appreciated!

Steph.

mickwinf:
if it cut out suddenly at 70 I would suspect electrical problem. maybe a short on the cut out circuit?

tom400f:
+1

You would have to suspect electrics if it's either on or off and nothing in between. Kill switch or anything in the low-tension side of the ignition, may be the wiring from your points is earthing (though that may only affect 2 cyls at once of course)

LesterPiglet:
I had the same problem. Faulty ignition switch.

Bryanj:
Check the connector block on the bottom of the ignition switch as the harness is tightly run and they can work loose.

It is possible to buy just the contacts part of the switch so you don't have to have another key if that is what you would like. I did have a couple of NOS bases ----IF I CAN FIND THEM---

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