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John Deere Tractors Discussion Forum
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Re: 620 carburetor problem

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jd2cylman

03-15-2013 18:29:07
67.167.218.125



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Well, there are 2 possibilities. First, check for adequate fuel flow to the carb. If you have good flow, check the intake manifold gasket. Spray a little ether around the intake to head joint. If the rpms pick up, the gasket is leaking air, which leans out the engine, thus the need for a little choke.

Good luck.

Adrian




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JD435

03-15-2013 22:33:41
69.66.180.211



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 Re: 620 carburetor problem in reply to jd2cylman, 03-15-2013 18:29:07  
2ND POSSIBILITIES IS CHECK THE INTAKE MANIFOLD. i HAVE SEEN THEM GO TO PIECES INTERNALLY AND MIX AIR FROM THE HOT - COLD SIDE OF WARMER ,AND MAKE THEM RUN LIKE THAT . LOOK IN THE CARB SIDE AND THEY DECAY AT THE BEND .TOOK ME MONTHS AND A LOT OF HEAD SCRATCHING TO FIND IT .GOOD LUCK JD435



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