SOHC.co.uk Forums > CB500/550
Just for Starters !
Bryanj:
Plugs, Plug Caps and vacuum balance of carbs---AFTER all service items done. Coil can't fail to just one plug as it's double ended but one lead can short to frame etc.
veefour:
Well i have done all i can think of, new plug caps et all ( all plugs have strong spark ). Balanced Carbs again ! At second thoughts it feels more like the choke is staying slightly on, when ridden it is sluggish but when opened up above 5000 rpm it accelorates quite quickly. Where do i look now !!
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.
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