SOHC.co.uk Forums > CB500/550
Just for Starters !
K2-K6:
It seems like you've been through all the logical stuf that should be checked and set, so if you're happy that those items are ok then you may having to start looking a bit further.
Next i'd check that you have no valve clearances that are too tight......followed by a compression check if you haven't already done that.
Just a quick check item to give you a lead.....start it from cold and run for about 10seconds then switch off......now carefully check the down pipes close to the head to see if you have any which are cold to indicate which cylinder could be giving you that missfire feeling.
mickwinf:
see my old post "3 cyl 550" as i had similar probs, turned out to be a bent float needle!
veefour:
--- Quote from: K2-K6 on March 05, 2013, 08:11:07 PM ---Next i'd check that you have no valve clearances that are too tight......followed by a compression check if you haven't already done that.
Just a quick check item to give you a lead.....start it from cold and run for about 10seconds then switch off......now carefully check the down pipes close to the head to see if you have any which are cold to indicate which cylinder could be giving you that missfire feeling.
--- End quote ---
I had previously checked valve clearances, & all the downpipes are getting hot. Will try a compression test next.
--- Quote from: mickwinf on March 05, 2013, 10:51:37 PM ---see my old post "3 cyl 550" as i had similar probs, turned out to be a bent float needle!
--- End quote ---
All the jets & needles etc. are new, & i have set the float levels as well.
The only thing i have not checked yet is the ignition timing !! Although i have a nagging feeling it is still carburation related.
veefour:
Braving the cold yesterday ( looks like we are going to put up with it for a while longer !! ) i decided to take the carbs off & check them all out again. After studying the manual ( again ) it states the needle clips should be in the 3rd / middle groove, now for some reason the original ones were in the 2nd groove ( from the top ) so this is how i had set the new ones. Would this have any effect on the poor running !
veefour:
Well I still haven't got to the bottom of the problem. The bike starts on the button, it does need a bit of fiddling with the choke for a minute or so but then idles nicely at about 1200rpm. While stationary it revs cleanly & responsively. The thing is when riding it feels rather sluggish with a burbling misfire sound, but when opened up quickly & the revs reach about 5000 it takes off smoothly & surprisingly fast. Took it for a 30 mile run this morning & apart from this it runs well. Getting a bit peeved now, any more ideas on this please.
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