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Please help with this mystery.

  • Thread starter Thread starter Markyd
  • Start date Start date
M

Markyd

Guest
My cafe is nearly complete, but here's the problem. One cylinder is not working, if just pops and bangs. It's got a spark, fuel, air and compression and all combinations of the above and it will not work. It ticks over nicely and you can remove the plug cap and it makes no difference what so ever. Remove any of the 3 others and the engine falters as it should. Help, any answers or ideas?
 
You made certain to have it running fine BEFORE you decided to improve the looks, right?
 
Try swapping the plug lead with its twin. If it's still faltering on the same cylinder try swapping the plugs.
 
I will get back to you, if it still falters what would be your thoughts? Thank you for your thoughts.
 
Since it pops and bangs, maybe this carb is way out of sync with others and not delivering mixture.
 
First idea is for you to click on SETTINGS at the top and then EDIT SIGNATURE and fill in the blanks. My crystal balls good but it needs a few clues to what bike, what style carbs..CV or VMs to even venture some helpful tips.

But by the way it sounds to me they are CV carbs and the butterfly on that carbs not open far enough. If they are CV carbs, loosen the adjuster jamming nut between the carbs and turn the adjuster screw a little to see if it lights off.
 
The butterflies may be "open" but are they open enough was my point. You can bench sync them and have a sliver between the bottom and the carb body that looks like it enough and buts not. Little more open and it light right off. Had a guy a few months ago that had this problem. He adjusted the screw with the bike running and it settled the situation.
 
How long was the bike sitting not running while you did your cafe conversion? Carb might be gummed up if it was sitting for a long(ish) time.
 
"Tickover" might have its problems, how about the rest of the rev range? Especially under load. :-k

If, while on the road, it settles in and smoothes out, I would suspect the idle circuit in that one carb.

Just because it "was running fine and smooth, ..." before the conversion is no guarantee that it's still "fine".

It does not matter what part you might want to discuss, it WAS working just before it failed. :-\\\

.
 
Clean the spark plug threads in the head on that cylinder and around the plug hole. Could be as simple as the plug not grounding good. Had that happen on a car once. Dead cylinder everything was there for it to fire and it wouldn't. Cleaned the threads etc and went to working again. Just had a slight film of oil preventing the plug from grounding, that was the problem.
 
Gutted, compression test all cylinders, 150 psi, 150 psi, 150 psi, 90 psi.
 
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