Does anyone else have frequent electrical problems with there 66cc gas motor kits

for bicycles? I installed a 66cc gas motor kit from Bikeberry & in 2 months I lost spark. Not knowing which part was the problem, I ordered 1-spark coil & 1-magneto coil. Now 2 months later (same problem). Are there other
people having this problem with these Chinese motors? If so I may have to buy a more reliable kit from another manufacturer. HOW SAD!
 
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