125-200cc Wr 125 no spark

Tried starting after a few months of no use. It ran for 3-5 seconds then stopped. Tried again but back fired and dead. Checked for spark, nothing: Removed the plug and cap, no spark. Fitted another coil, no spark. Isolated the kill switch, no spark. Checked the woodruff key, all good. Checked the generator timing mark position, all good. I’ve not tested using a multi meter. Has two earth points: coil mount and a wire from the coil onto the frame. Any suggestions?

Ps: plug is wet from fuel. Good compression.

Which model year wr125? Sounds like all that's left to check is the spark plug wire and "generator" output, assuming you tried a fresh plug

I tried a new plug. 2009 model.

So seperate coil and ignition? Add ignition to the list if so. First thing I'd test/replace is the plug wire!

I have fitted a new coil and lead. Im not sure the coil lead would cause the back fire.

No cdi. Generator goes direct to the coil and frame earth. No lights or instruments fitted.

Not sure about UK models, but if it looks like this it's a Ducati ignition with integrated coil:
http://www.cafehusky.com/threads/making-a-wr125s-electrics-into-a-cr125.88220/ There has to be an ignition of some sort, that's what the plug wire is conneted to.
Check the earth points and all the wires very carefully. Otherwise, test output starting at the generator working up or plug cap working down.
Ducati ignitions have a bad reputation although I haven't had any problems...yet

It is still the old ignition Husky did not go to the Ducati ignition until 2011. I do not think the Ducati ignitions are bad, they just are not as stone reliable as the Kokusan.

It was a bad frame earth causing the problem. Thanks for the replies.

awesome result.

(an old timer once told me this as i sat over-pondering a conundrum) young man...confucious say: solution to problem will usually be the simplest and most logical one.

words i now live by! mreep!