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Iv got a 50hp that's drove me nuts. Top and bottom plug don't change engine sound much when pulled off at idle. Middle bogs it down. Compression is 100 all cylinders. Its hard to start cold once warm it starts right up in water you take off it bogs down keep crankin throttle it will finely take off run perfect on top end. Iv checked all fuel and filter relaced bulb and hoses. Checked timing at top dead center switched coil packs around no change. Somebody told me carbs dirty or poss a timing cdi unit what is this and. Do you think it will help. Thanks for any help. Craneop
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