Posted by Ron in Nebr on November 03, 2010 at 23:57:55 from (66.252.113.182):
In Reply to: 650 IH posted by plow hand on November 03, 2010 at 19:44:15:
When I got my 650D the little "cam" in the carb that shuts off the float when switched to deisel had come loose...was just a little nut on a threaded shaft that had worked loose. I realize that this probably wouldn't be your case where it runs on deisel but maybe not on gas, but who knows what's going on inside those carbs until you take 'em apart and look. They're very simple carbs, and OEM Tractor parts(I think) has a kit available for them. When I took mine apart the gaskets were still ok and I was able to reuse them.
First of all to check stuff, make sure your starting tank has gas in it, open the valve at the sediment bowl under the starting tank, then open the petcock at the bottom of the carb(with the switchover lever in the "up"(gas) position and make sure gas is getting to the carb.
If the only way to spin the motor is to pull the tractor, you can vice-grip a spark plug someplace visible to a good ground and hook a plug wire to it and watch for spark while someone pulls you...might have to rob a longer plug wire off something else, but this'll tell you if you have spark at the plugs or not.
If there's spark at the plugs and gas in the carb and still no start, it's time to start looking into the switchover mechanism to make sure everything's moving like it should. Since it runs good on diesel, it's probably a safe bet the starting valves are closing ok, make sure they open when the lever's moved to the gas side(pull valvecover to check this).
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