1998 Cb600 won't start

[Beefy809]

Hi guys,
I have a 98 cb600f that won't start. I have tested the ecu in my mates cb and it starts his no problem, its getting fuel ok. Tried an ecu from a cbr and it started but not running right. Anybody any ideas what's wrong

[finpos]

Try starting it off a booster pack or even better a car battery. Don't rely on the bike's battery alone, even if it's fresh off a charger. Notorious engines for being difficult to start with half knackered (i.e. seems ok to casual inspection but in fact are on their last legs) batteries.

f.

[Beefy809]

I tried it with a booster pack but still no joy, could it be the timing out or something like that ?

[finpos]

No, timing will be fixed. Next obvious thing to try is to get the plugs out, see if they are wet with petrol and see if you are getting a spark out of them. Burn all the muck off the plugs (even if they look clean) in a gas flame, put them back in hot and try again.

I'm guessing at that age it has a choke so it's worthwhile making sure that works as well.

f.

[Slacker24seve...]

Has it been sat for any period of time? If so drain the float bowls.
As mentioned above, check the spark and check all the fuel hoses.
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