Posted by Fixerupper on July 22, 2010 at 17:53:43 from (207.199.205.40):
In Reply to: Carb upgrade? posted by nosoup4u on July 22, 2010 at 12:11:57:
Is there an accelerator pump in this carb? If it does there's a chance it's sucking gas past the pump plunger. I'm not an expert on this by any means, but I did have a problem like this on my 105 gas combine with a 4020 engine. Deere had an accelerator pump in the Marvel Schebler carb on some of the new generation models, and when the brass vacuum piston wore a little in the bore gas would start sucking around the piston and into the intake manifold. I plugged the vacuum hole in the top of the carb and that stopped the rich idling and helped the fuel economy. The downside was I had to open the throttle slowly or it'd cough and spit. I was told the Oliver 1850 gas had the same carb and the same problem too. Just an off-the-cuff suggestion. Jim
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