SOHC.co.uk Forums > CB500/550
I need a carb sync - Anyone in North London?
Nurse Julie:
--- Quote from: michtag on August 13, 2020, 02:11:31 PM ---
--- Quote from: Nurse Julie on August 13, 2020, 01:30:21 PM ---What spark plugs are you using?
--- End quote ---
Just plain NGK DR7ES they are fairly new, maybe have 30 miles on them. I cleaned them from carbon deposit because the mechanic I trusted to solve my troubles actually made it incredibly rich (4th groove on et needle!!) and as a consequence exhaust and plugs just got covered in black soot. BTW, I moved the needles back to the 2nd groove...
Not sure I have a new set of plugs to try if any difference now, would that be worth it?
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Remove the resisted plugs and fit non resisted (D7ES or D7EA) . You only need resisted plugs fitted if you have non resisted plug caps fitted. Too much resistance weakens the spark. I don't think it will solve your problems but having both plugs and caps fitted with resistors won't help.
The DR7ES were the standard fit with the metal, non resistor caps, which were changed at PDI usually (well, thrown in the bin as I understand it).
michtag:
--- Quote from: Nurse Julie on August 13, 2020, 02:58:41 PM ---
Remove the resisted plugs and fit non resisted (D7ES or D7EA) . You only need resisted plugs fitted if you have non resisted plug caps fitted. Too much resistance weakens the spark. I don't think it will solve your problems but having both plugs and caps fitted with resistors won't help.
The DR7ES were the standard fit with the metal, non resistor caps, which were changed at PDI usually (well, thrown in the bin as I understand it).
--- End quote ---
A-ha! that is useful info indeed, I had not realised. Well it may not solve this problem, but it can't hurt and it is more correct. In fact from older pics I can see my bike came with D7EA, so I must have bought DR7ES just reading old specs around.
Thank you Nurse Julie!!
Seabeowner:
I have the original metal plug caps one of my 500s. They all measure 5-6k ohms. I've used resistor and non-resistor plugs and never had an issue. Original plug caps on my US 500K0 are 7.5k.
K2-K6:
--- Quote from: Seabeowner on August 13, 2020, 06:11:38 PM ---I have the original metal plug caps one of my 500s. They all measure 5-6k ohms. I've used resistor and non-resistor plugs and never had an issue. Original plug caps on my US 500K0 are 7.5k.
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I don't see it as a fault either. The general internet view is significantly skewed I feel with it usually resulting in a dead end argument of never the two should meet :D
Granted you get a different effect, particularly it appears to lengthen spark, which is useful IF you can make advantage of the characteristic.
The theory that it generates less spark appears to be derived within magneto systems, but used in error for coil based system.
It'll be interesting to see if there's any improvements by changing the plugs, but think there's potential circumstances under which that would indicate another error.
JezzaPeach:
Michele, a long shot, but is the petcock gauze clear. I had erratic fuel flow and cleaned it in vinegar and very gentle brush with an old toothbrush. Then a column of water from a tap would pass freely through it uninterrupted.
I find even when all clean, fuel often only manages to flow through one pipe at a time, so eg from empty, carbs 1&2 and 3&4 don’t both get full flow at the same time, and maybe a slight restriction could cause flow to fluctuate.
As I say very much a long shot, but quick and easy to check, and always good to know it’s ok.
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