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Old 10-05-2015, 07:01 PM   #10
cableguy0
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Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
Re: Tuning carb with a Vacuum Gauge

You need to find out if your mechanical advance is working. Remove the distributor cap and grab the rotor. You should be able to move it and it should spring right back. The effort required should be minimal. Timing at 10-12 is about right. What kind of carb do you have and what condition is it in? Stumbling on acceleration could be lack of mechanical advance working. It could also be an issue with the carb. Timing and ignition system needs to be right before you even touch the carb though. What kind of spark plugs are you using?
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