SOHC.co.uk Forums > CB500/550
Just for Starters !
veefour:
I have just noticed the Choke Flap on the Carb nearest the Choke Lever is not opening quite as much as the others. It's only slightly different but do they all have to line up by the same amount.
K2-K6:
If as you describe it's only slightly different, then it would be unlikely to have such a pronounced effect on overall running.....it would be more typical having one odd setting to notice less peak power I feel.
If you haven't verfied the timing is accurate and the advance is working correctly, then it would be wise to check it through to mke sure nothing fundamental is wrong.
Presumably once it's warm it will run without choke at all? and if so, when you are running at sub 5000rpm (hesitantly) then if you hold the throttle steady and bring some choke in, then does it improve or get worse?
veefour:
I am beginning to think I am never going to get to the bottom of this >:( I have just changed the coils for some different ones now & this persistent misfire is still there. So to recap, coils changed, new plugs & caps, points (timing done), valve clearances done, all new carb jets, floats height set, carbs balanced, compression test done all the same pressure. Engine starts on the button & revs cleanly with no smoke & all four pipes get hot, but on accelerating there is this persistent misfire. The No.1 cylinder plug is getting very sooted up so somehow it must be running rich but why !! (Not the plug as I have swapped them around). Before long it will be staying under the covers if I can't sort it soon ::)!!!!!!!!!!!
z1100r:
Go up a long steep hill and let it pull in top gear wide open throttle for a while, plug chop it and check out the sooty plug. If its feels to be on all 4 flat out and plug has cleaned up..get the carbs off again and check that particular one out. I suspect an issue with that carb. For these little Hondas to run like sewing machines the carbs have to be perfectly clean, set up correctly, and balanced. I have had a simlar issue with blocked primaries. Hold them up to a light and look through them, you should see a pin prick of light. On the later better carbs you have to pull primaries out with pliers. buy a set of cheap micro drills off of Ebay...they are great for poking out any crap. If you use your fingers to twiddle them you wont do any damage. Fairly convinced its the carbs.
veefour:
Does anyone know where I can get carb manifold O-rings if I need them, David Silver doesn't list them.
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