Misfiring at high revs. - Fixed.

[mchaggis]

It started again on my little Chinese machine, and a good dollop of Redex squirted through the carb at a high idle didn't fix it like it apparently did last time. I'm wondering if the soot in the cylinder, exhaust and spark plug is a symptom rather than a cause.

My mum's CG125 has no problems at speed, so I had a look at the CG125 ignition, and while the spark isn't big, fat and blue, it is a lot more energetic than the Hongdou's. The spark on my Hongdou is a scrawny little yellowy white thing. I've tried a new spark plug and it is the same.

I have also noticed smudgy black marks on the insulation on the Hongdou spark plug, which makes me wonder if it is the HT lead or perhaps the CDI? I've tried the spark plug caps from both machines on both machines, and the CG seems to produce a more healthy spark in both cases. Therefore I'm not sure that it is the plug cap which is dodgy, though the rubber is starting to perish on the Hongdou.

The horn, lights et al are fine on both machines, and they both normally start without a fuss, so I doubt it is the battery, though it could be.

Any ideas?
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I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[mchaggis]

Fuel, sparks, filters, nothing of the sort.

All my problems were in fact caused by a loose connection on the ignition coil. The only reason I discovered this was because today it wasn't sparking at all. The rich running was simply because it wasn't running properly at all.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[Brava210]

nice to see you sorted it,also nice to see someone else with a hongdou !
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Honda Novio, Puch Grand Prix, Suzuki AP50, CZ 125, Wassell 125, Montesa 348,Honda 125TDC, Suzuki 100ER, Suzuki GSF650 Bandit, Aprillia Pegaso, Honda PCX125, Honda Forza300, BMW G310 GS, Suzuki SFV650, Honda CB500X

CHARLEY SAYS " ALWAYS TELL YOUR MUMMY BEFORE YOU GO OFF SOMEWHERE"