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ChadS
04-09-2008 06:18:08
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Re: 770 Carb Question in reply to Tal, 04-09-2008 05:55:23
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What is the plug gap set at? Had a Super 77 in the shop for a tune earlier this year, had the same problems,, went from .040 down to .030 and it did seem to help. You must be able to run the engine at full throttle, and then back out the main load adjustment screw and make it smoke/run rich. Pull out the spark plugs and see if they are a light color,, if so, then you can stand to increase you main jet size, a little at a time, to see if any changes help. Check for vacuum leaks, check the distributor for any signs of wear, rocker arm tips worn, and make sure you have a good spark plug and a good fuel. Too much octane in fuel will make it stutter, too much plug gap will cause a stutter, not enough fuel thru the metering circuits )main jet and metering nozzle) creating a rich idle and a lean high rpm condition. I dont know of any tractor engine that has been rebuilt, that you did not have to rejet the carb on. Hope this helps,, ChadS
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