Alright then, heres my problem. Motor was running great for months and then boom! No spark! and of course 6 miles frome home. Have been through everythin including replacing everything. New magneto and magnet, plugs, wires, and a lightning cdi and still no spark. I dont know where to look anymore so any help is much appreciated.
Sounds like we are suffering from an almost identical problem and have used almost identical problem solving methods.
My situation is a little different in that the engine runs, but it has a persistent "spark miss", or what feels like a spark miss below 3,300 rpm; getting progressively worse as the engine rpm is lowered.
I have changed the entire electrical system with new components, including 2 new magnetos and one old magneto from another engine that works. I have changed two brand new Jaguar CDI's and one Jaguar CDI from another engine that worked correctly, as well as installing an original OEM CDI.
I have changed three sets of Magnecor spark plug leads (all brand new) and 3 new NGK spark plugs.
I have changed out the original Jaguar coil for 2 brand new Jaguar coils and also the coil that's included in the standard CDI.
In desperation i have also removed the original engine (which was a rebuilt engine) and replaced it with another fully rebuilt engine, then in further desperation i have installed an engine that previously worked well, but was removed because i lightly scratched the crankshaft trying to replace a crankshaft seal.
So in total i have replaced the magneto 3 times - the CDI 4 times - the engine 3 times - the spark plug 3 times - the spark plug leads 3 times - the coil 3 times, if you include the coil in the OEM CDI.
and
the spark miss replicates itself in every combination i try,
oh yes,
and i have been up and down with jetting and removed the diaphragm carburettor and gone back to a standard NT carburettor, followed by purchasing a brand new NT carburettor.
The end result is that the spark plug miss is ever present.
I have even tried making up batches of fuel from different fuel companies.
This is the first time in the history of playing around with these 2-stroke Chinese bicycle engines that i
"can't" fix the problem, and yes, the killer switch is disconnected from the ignition system and the (magneto) white wire is isolated.