SOHC.co.uk Forums > CB500/550
Wont exceed 4,500 rpm then stalls and wont restart - on route to MOT
Yoshi823:
http://www.sohc.co.uk/index.php?topic=2849.0
totty:
Hi,
The problem existed prior to fitting the electronic ignition.
The coils were replaced as part of the electronic ignition kit, plugs are new NGK irridiums, also tried normal NGK plugs and the caps are new NGK 5k.
Float heights are correct and loads of carb cleaner has been blasted through every orifice twice.
I've used the spray something flammable in the area vacuum leak test 3 or 4 times without any signs of leakage so I think those seals are ok, but if I have to resort to removing the carbs again I'll replace then just to be sure.
I've noticed that it's allot worse when the weather is cold so I'm working on the theory that it's running lean, I'm going to see what effect raising the needles one notch has.
If that fails I'll relay the ignition so I'll keep the ignition and kill switch control but without running the current through them.
totty:
Has anyone got any idea how you access the needles on these carbs ?
It's a K3 and it's the PD carbs with the sync adjusters under the top covers.
I can't see how you disconnect the linkage and remove the slides so I've just put it back together for now.
metalcatfish:
I doubt if the needles are your problem but I guess its worth a look anyway. Take off the tank, Take the tops of the carbs off, Undo the philips screw that secures the lifting arm to the rotating shaft.
Get a thin philips screwdriver down inside the slide and disconnect it from its arm. Disconnect the arm being carefull not to lose screws or the little spring and pull the slide out, its easy. If you cant get to the screws gently twist the slide and its arm till it comes off, yourll see what I mean, then pull the whole thing out and then undo the screws inside the slide. Jap screws are made of chocolate so be carefull if there a bit tight. You can do this with the carbs in place.
totty:
--- Quote from: metalcatfish on June 21, 2010, 09:44:05 PM ---I doubt if the needles are your problem but I guess its worth a look anyway. Take off the tank, Take the tops of the carbs off, Undo the philips screw that secures the lifting arm to the rotating shaft.
Get a thin philips screwdriver down inside the slide and disconnect it from its arm. Disconnect the arm being carefull not to lose screws or the little spring and pull the slide out, its easy. If you cant get to the screws gently twist the slide and its arm till it comes off, yourll see what I mean, then pull the whole thing out and then undo the screws inside the slide. Jap screws are made of chocolate so be carefull if there a bit tight. You can do this with the carbs in place.
--- End quote ---
Cheers, I'll give it a shot later in the week.
I doubt it as well but I'm getting desparate, I can't see anything wrong with the floats or lower jets and replacing the ignition system didn't really make any difference.
The significant improvement in hotter weather makes me side with it being a fueling issue.
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