SOHC.co.uk Forums > CB500/550

Carbs

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captaindonutbikes:
yes you know its that cb550 k3 lean burn carb time!

so she will start but only on full choke, if i reduce to 2/3rds choke she will die. no idle.

so my thoughts are to richen first ? running far too lean or does this sound more like an air leak ? carbs were fully rebuilt with new needles and floats.

floats were set as per book -
running k & N filters.

want to to carb sync but i am right in thinking this will be irrelevant until i can get a solid idle?

all help as always warmly appreciated.

so close but yet so far

captaindonutbikes:
oh and have been reading the MOT stall thread.
 ;)

Bryanj:
pull out the pressed in pilot jets and clean them in a solvent solution, always cured that problem for me

K2-K6:
Bryan seems to no more about which jets to clean than me, so I guess that's where to go first if not done already.

Pilots are mainly there to give fuel supply when throttle closed / near closed so try revving it a bit and take choke off to see if it'll run at higher throttle as this will confirn pilots without dismatling if that makes any sense!

Friend had a new 550F2 in the 70's and that alway's seemed to need a lot of warming on choke before it would run clean, we were always waiting for him on cold starts.

What number plugs has it got they should be something like NGK 8's any higher and you may struggle.

Balancing can be something and nothing. I've always set the slides up visually first and if you are fairly particular / accurate then that is normally good enough to get running so can't see that causing the  problem you describe. Final balance when you get it running reasonably, it mainly gives a smoother idle when done.

captaindonutbikes:
brand new press in jets infact everything is brand new and cleaned meticulously.

i shall try the high throttle to see if its the push in jets but it seems a bit lean to me.

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