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redmodelt · 02-11-2021, 12:41 PM

Is it back firing out the carb or exhaust? No 1 plug is the coldest so what do the rest of the plugs look like? If the rest are black from carbon, then yes running too rich. Which type/brand of carburetor are you using? Turn the spray needle down till the engine starts to stumble and open a bit. May need a bit more adjusting when you are driving. Are you using the copper crush rings or the fiber type 3 in one gasket on the manifold? Google "MTFCA checking for vacuum leaks"

02-11-2021, 12:41 PM	#8
redmodelt Senior Member Join Date: May 2010 Location: Portland OR Posts: 6,341	Re: 1923 roadster running bad need help Is it back firing out the carb or exhaust? No 1 plug is the coldest so what do the rest of the plugs look like? If the rest are black from carbon, then yes running too rich. Which type/brand of carburetor are you using? Turn the spray needle down till the engine starts to stumble and open a bit. May need a bit more adjusting when you are driving. Are you using the copper crush rings or the fiber type 3 in one gasket on the manifold? Google "MTFCA checking for vacuum leaks" __________________ I know the voices aren't real but damn they have some good ideas!