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1970 200 20hp loses spark as soon as it goes above idle. I've checked the timing several times, checked the points and reset the gaps, replaced the coils and cleaned all of the stator connections. I have also checked the insulator blocks. The spark at idle is blue and jumps over 1/4 inch. I have to say, I'm a little perplexed. Any ideas will be greatly appreciated as I am tired of beating my head against the wall.