Sounds like a snow ball of things there mate. How good is your battery first of all, is it strong??? And yeah yellow spark, could be high resistance in your lead (king lead) and could also be the coil, fit some leads, clean the cap inside and out check for cracks, and check the condition of the rotor arm, make sure the carbon brush in the centre of the cap is intact, but before i go too far what is your engine number??? and the age guessing around 1985 ish
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