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I recently picked up 1980 john deere spitfire. It starts and runs fine but if I let off the throttle it dies. also I have to use the choke to get it started even if its warm. Does anyone know what could be wrong?
 

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Discussion Starter #3
I cleaned the carb, put fresh gas in it and the plugs are good.
 

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Does it have a fuel pump? How is the compression? Is there an inline fuel filter? Your guess is as good as mine I guess.... It does sound like its lean for whatever reason. Does the carb have a rubber diaphragm, a slide style carb?
 

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Have you tried turning up the idle? Perhaps it's just set to low.
 

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I had the same year Spitfire with the same problem. I rebuilt the engine, replaced the carb, fuel system, etc. Nothing helped. I think it's just vapor lock because the engine just got too hot. I placed snow on the carb and manifold for a few minutes and it would start just fine.
 

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Originally posted by Born2Fly
[br]I cleaned the carb, put fresh gas in it and the plugs are good.

Slide or Butterfly carb?

If Butterfly replace it with Mikuni 34VM slide. If VM 34 You need to adjust the slide with the idle adjustment screw located on the rt hand side of the carb if you are standing in front of the sled

Good info and additional help over at:

http://www.angelfire.com/pa2/jdsleds/
 
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