Well.
Mines the s6e
My problem(s) have come from the spark plug wire, the rubber must not like the weather here and I keep it indoors when not ridden. It started to ground out to the frame and basically leak the spark where ever it could. So much so that one day it shocked the (double hockey sticks) out of me a few times from both brake handles.
Wake up call indeed.
Heres the problem, the rubber insulation on the plug wire is crap and the wire goes into the coil with no real way to replace the wire short of breaking open the coil. This basically means spend upto about 1/4 of the engine cost on a plug wire and pray that it holds up better. I haven't had the cash to do just that so i've wrapped in in about 8 layers of electrical tape and soon to be some of that plastic protective covering.
It's also not a copper wire so trying to solder it part way through is not going to work.
Due to the above I wouldn't be surprised if my latest problem is related.
I've now blown 2 L78C plugs in about a week and a half. Left at work with 15km to peddle
It's hovering around freezing here, I keep my bike inside at night and it gets me to work great in the cool mornings, but sitting outside 7-8 hours at work, It's harder to start but tends to foul out the plugs after running for a few blocks, kinda puts out and dies, sometimes depending on speed it'll backfire. (Loud crack) Chinas backfire was more of a pop. I do let the engine warm up well.
I think if the plug wire was better I would have only had a flat tire, with that being totally my fault and very avoidable. (let the tire wear through)
15km*2(for each way)*80 (work days since build)=2400km just going to work and back.