SOHC.co.uk Forums > CB500/550

Rough running

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Oldbuthopeful:

I thought of you today mickwinf, as I took the carbs off for the umpteenth time, but it's coming down to 30 mins after all the practice so,  within a couple of hours, I'd checked the slow running jets (all clear) and the float heights  -  needed a bit of a tweak  -  but what's with the emulsifying jets Oddjob ?  I pulled out the two little brass tubes at the mouth of each of the inlet ports, expecting to see tubes with lots of little holes in.  Am I looking at the wrong tubes?  These were only about 10mm long and didn't have any lateral holes.  Maybe I've misunderstood !
Anyway, I put the whole shebang back together, fired her up and, when she was warm there was a significant improvement.
On the road, there was a bit of hesitancy when the throttle was opened, but she'll tick over and get me round the block, so I think it's time to look at the timing with the old strobe light.  I'm deffo not going to take the carbs off again for a while !
Holidays are looming, so I'm taking the 350 to Bakewell tomorrow for a look at the Classic Bike Sale/Show and will tackle the 550 wwhen I get back end August.
Top of the list will be spraying to check for leaks on the induction  side as suggested, so thanks one and all for your input.
It's much appreciated and is invaluable when you've reached screaming point and there's nobody to turn to !!

LesterPiglet:
The brass tubes the needles go into, let's hope they don't look like this.



I used the flat of a screwdriver in the carb throat to push them out.

Oldbuthopeful:

           Thanks for that Les.  The carbs are now back on the bike but when I get back off hols I'll have them off again
           and search out those tubes.  If mine are anything like those in your pic, they'll sure benefit from a good going over.
           I'll report back in about 10 days time.

           Could I just trouble you to explain whether they push up or down to extricate ?  Forgive my dimness, I don't know
           my way around these things like you guys.   Ever thought of publishing a Haynes- type manual between you ?!

           DC

LesterPiglet:
They push down towards the float bowl.

Oldbuthopeful:

You're right Lester Piglet, they look nothing like yours !  After taking out the (new) mainjet and removing the
throttle slide and the needle, all I'm left with is the little jobby on the right of the picture, which I drifted out
with a suitable bolt.    It looks to me as though I've got  different spec carbs on my 550K3 or am I still showing
my ignorance ?
I was really looking forward to finding something that was gummed up and would have made all the difference
to the bike's running once I'd cleaned it !   
So it's back on with the carbs again and set about using Oddjob's spit test for leaky induction seals unless someone
tells me different.
DC

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