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| | | | Joined: Oct 2012 Posts: 85 Shop Shark | | Shop Shark Joined: Oct 2012 Posts: 85 | I have a 235 engine on this 1950 3100 with a Rochester carb. This past winter I had the carb rebuilt by a reputable mechanic. Since then the engine is sputtering. It starts and idles great and if I give it gas slowly it runs good. If I do it quickly it sputters and is gutless when changing gears. I checked my vaccuum advance on the distributor and it works fine when I rev the engine. Timming is dead on. The engine ran good before the carb rebuild, just thought it be good to rebuild it since I didn't know it's history. Any ideas.
Last edited by DJRoy; 04/18/2014 12:44 AM.
| | | | | Joined: Feb 2014 Posts: 34 New Guy | | New Guy Joined: Feb 2014 Posts: 34 | Pull the plugs and see if you are running rich or lean, my guess would be accellarator pump. | | | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | 1st and easiest test is to make sure the correct carb to manifold spacer gasket was used. The proper gasket should have short openings radiating out from the center hole to allow vacuum to get to the power piston.
2nd easy check is to make sure the throttle linkage is connected to the short excellerator pump linkage on the outside of the carb. If the pump doesn't squirt a small stream of gas into the venturi when the throttle is depressed the engine will stumble and hesitate on excelleration.
Other checks require disassembling the carb to make sure the proper sized BB's are in the correct passages.
Also make sure everything associated w/the carb mounting is good and tight and theres no vacuum leak.
Good luck
Dave | | | | | Joined: Dec 2001 Posts: 1,248 'Bolter | | 'Bolter Joined: Dec 2001 Posts: 1,248 | Almost sounds like the accelerator pump in the carb isn't working...
John
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