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ford 650 chugging and dies

H

harry king

New User
have a 650 ford. 12 volt system. ran fine last year. When it is cold , it will run for 30 minutes then start chugging and some times die while pulling a 6 foot finish mower..(like out of gas)
Then it will only run for a few minutes and chug, with pto off and won't even pull tractor. idle is ok(hot or cold). New plugs(look ok i.e. gray tip), coil, points, cond, rotor, no water or dirt in fuel. Carb rebuilt. New balast resister. Also tried switching coil to put plus side to distributor. Coil is hot. 14v into ballast and 10 out, and 10 out on negative coil side to dist.Seem like it runs hot(even though it says 180). I mean the intake is to hot to touch and the air tube from air cleaner is hot.timing is at 4 degrees. use 87 gas from Kroger. Any ideas.
 
Is there a main jet adjusting screw on the carburetor? If it does that needs to be opened to enrich the fuel mixture. If its running lean that will cause it to run hotter. You probably should be the using at least 89 octane. See the pic of the B&S carb with that main jet. Hal
62pv03k.jpg
 
Sounds like your coil is building resistance when it gets hot. I've had this problem on several trucks and tractors. Check the resistance when the coil is cold and after it warms up. I can't remember the threshold, but if you see a big jump in resistance that is probably your trouble.
 
I have the other type of carb..the one with the hand screw on top front of carb. See my other reply from today.
 
ok. resistance is 135 on 12V coil and 140 on the 6V on the bench. Put 12V on tractor, key off, all wires hooked , still 135. Drained all gas and put in 94 octance from Exxon(same as all I guess). 87 degrees out, 53% humiditiy. All rest the same. Was going to check again and swap to 6V coil and then check it. Anyway, mowed for 35 minutes and no problem. this is driving me nuts. Will keep you posted when I mow next week . I might just remow the back tomorrow or Tuesday to try and get another failure. Thanks.
 
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