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Two most common issues are fuel and fire. You gotta see if it is getting both of those.Yep, those are the two favorite suspects, and my personal nemesis is fuel. Is this a recent problem, or has the little darling been sitting for a while? If you take the air cleaner off and squirt some gasoline into the carb and it fires, it's probably fuel delivery or quality.
If you don't get any hint of starting, it's probably a spark issue. Take a peek at your plug, and be sure you're trying all this with nice, fresh fuel.
What is it with the John Deere D100's. Isn't it a new model?I don't think it's necessarily anything to do with the particular model. It's likely because of the price and availability a Lot of them are out there. And so there will be more of them having problems.The problems will most likely fall within the 2 main groups with engines.: Fuel related Or Ignition related problems.A lot of these problems could be easily solved with a simple eliminating one or the other.
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Spraying a flamable liquid into the carb, see if it starts. If so solve the fuel delivery problem.If there is no indication of a start. Check for an ignition problem.Once the problem is resolved. Try to eliminate a reoccurrance if possible.