Yuck...Never had the pleasure or displeasure to work on Lauson engines but I do remember a tech behind my home when I was a teenager that hated them.
My day was a little frustrating too, I have been working a Chinese ATV since late December. One problem right after another. hat is what you get when someone that no idea of what they are doing screw everything up. I got it finally to hit several weeks ago to only find out the head gasket was blown. Not fun to tear down and reassembly without even an IPL to go by. Well got the engine on and tried starting it. Didn't won't to go at first then she fired up and ran fairly good after carburetor adjustment. So I put the foot rest back on then it would start. I from lost spark again even with a new CDI system module and coil. I definitely was hoping it wasn't the trigger module.
The only thing I did different during shut down was to use the handle bar kill switch. Well it had to be the part that I couldn't get back in January. So I disassemble it to find the kill switch reading shorted even in center run position. Since I use to take these switches apart when I worked on office equipment I proceed down that path to see why it was shorted. It turned out a brass path between the contacts form wear, once removed the short was gone. Reassemble with dielectric grease (none found in the switch which explains the wear) and on the first try engine fire back to life. Just lucked out that was it.
So glad to finally have this nightmare repair ready to leave the shop as the distributor and the parts supplier were of no help providing any diagrams; just the parts that I guess at being the right ones. I am so frustrated that I think I might not even try working any more these clunkers but It should be good training while learning to work on ATVs.
