Angelo Posted April 28, 2023 Share Posted April 28, 2023 1952 Mack l85 . I have rebuilt carb. New fuel pump with 4lbs at carb. Good fuel. Still breaks up when throttling up. New plugs,wires, points etc . Is there a timing advance in distributors. Maybe it’s stuck. I know there is no vacuum lines to them so how do they operate. Anyone have a clue? Quote Link to comment https://www.bigmacktrucks.com/topic/72794-timing-advance-on-707b/ Share on other sites More sharing options...
609albert Posted April 29, 2023 Share Posted April 29, 2023 are you running on both sets of ignition system ? try 1 set and the the #2 set. which runs smoother ? I run my Mack fire truck usually on both. Also I install electronics in the distributors ,If you ever decide to do that you have to use a positive ground unit ,no big deal. never have to set points again. I used Petronic brand. Also is your fuel good? Quote Link to comment https://www.bigmacktrucks.com/topic/72794-timing-advance-on-707b/#findComment-530280 Share on other sites More sharing options...
yarnall Posted April 29, 2023 Share Posted April 29, 2023 Who rebuilt the carb? I had trouble with mine. Replaced fuel pumps and filters them finally had the carb properly cleaned and rebuilt. It runs great since. Now if I could get it to stop better. Quote Link to comment https://www.bigmacktrucks.com/topic/72794-timing-advance-on-707b/#findComment-530283 Share on other sites More sharing options...
Angelo Posted April 29, 2023 Author Share Posted April 29, 2023 Had dynamic carb in Mount Vernon ny. He’s old school guy that does a lot of old and rare carbs. My fuel is fresh, good pressure. I’m wondering if my advance weights are stuck in distributor. It idles great but starts breaking up when you get into pedal Quote Link to comment https://www.bigmacktrucks.com/topic/72794-timing-advance-on-707b/#findComment-530298 Share on other sites More sharing options...
jebB Posted December 14, 2023 Share Posted December 14, 2023 I have found if you do 13 to 18° should work it did on my 707c motor Quote Link to comment https://www.bigmacktrucks.com/topic/72794-timing-advance-on-707b/#findComment-543455 Share on other sites More sharing options...
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