I have got this machine to fix up a 1988 Moto 4 225cc, I have fixed the electric start. it seems to have good compression, I sprayed some starting fluid in the cylinder and tried to start it. It would not even sputter, I took the plug out (it is new) and set it against the cylinder and tried again, there was spark, but it didn't seem very strong. What would you guys suggest to try, coil? CDI? Thanks for your help