checking vacuum advance
Senior User
Joined: Jul 2004
Posts: 484
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From: Roland, Ar
Use a hand held vacuum pump and apply vacuum to the advance. the arm should pull into the housing and stay as long as there is vacuum. If you do not have a pump remove the advance or use a long piece of vacuum hose and connect it to another running engine and use its vacuum.
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Yes, usually the fitting in the bottom passenger side of the carb in front of the choke assembly. You will need to reset the timing with it unhooked. Try about 10 BTDC then hook it up and see how it acts. You may have a vacuum leak or the mixture screws on the bottom of the carb need to be backed out a little bit to correct the idle. I don't think that the vacuum advance will cause that.
