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Weak spark on 1968 Super Convertible L

1K views 11 replies 8 participants last post by  cmeyers77  
#1 ·
Hello, all.

Had no spark so got rebuild for magneto; did points but not coil. After rebuild, turned it over and I got spark but too weak; feel a shock and spark from plug is yellow instead of blue. Wondering what may be the problem? Tested coil before and it lit up (could it just be tired). Any thoughts? Tractor serial: j33492.

Thanks
 
#8 ·
Im not the thread starter obviously but I have one that has a Studebaker engine and it runs and sounds great but I could hardly see the spark on it and Im thinking it was yellowish and remember saying on here back then " thats the weakest spark I have ever seen". For what its worth.
 
#10 ·
Hello, all.

Had no spark so got rebuild for magneto; did points but not coil. After rebuild, turned it over and I got spark but too weak; feel a shock and spark from plug is yellow instead of blue. Wondering what may be the problem? Tested coil before and it lit up (could it just be tired). Any thoughts? Tractor serial: j33492.
Thanks
JMR,
I would investigate the plug wire itself - there is a service life for these wires and this may be the cause or a least a contributor to your issues. The fact that you felt a shock may be indicative of this sort of problem. These are easy to replace. A solid core wire conductor is required for magneto-equipped machines - a previous owner may have installed a suppression-type wire. One of our members wrote up a neat posting on this very subject;) - it is a little lengthy but worth a cursory glance over: A Primer on Gravely (T-head) Spark Plug Wires

Does your machine run with in its current condition? I've seen machines run really well for years with a yellowish spark.


Im not the thread starter obviously but I have one that has a Studebaker engine and it runs and sounds great but I could hardly see the spark on it and Im thinking it was yellowish and remember saying on here back then " thats the weakest spark I have ever seen". For what its worth.
Mark,
I am GLAD to see that you are back!!!!
 
#11 ·
JMR,
I would investigate the plug wire itself - there is a service life for these wires and this may be the cause or a least a contributor to your issues. The fact that you felt a shock may be indicative of this sort of problem. These are easy to replace. A solid core wire conductor is required for magneto-equipped machines - a previous owner may have installed a suppression-type wire. One of our members wrote up a neat posting on this very subject;) - it is a little lengthy but worth a cursory glance over: A Primer on Gravely (T-head) Spark Plug Wires

Does your machine run with in its current condition? I've seen machines run really well for years with a yellowish spark.




Mark,
I am GLAD to see that you are back!!!!
Yea just got caught in a bad way while sick but I dont sit and lick my wounds for very long Bro because Im just as good and smart and clever as anyone else on here or anywhere else as far as that goes.
I love Gravelys and used them as a youngster and want to introduce my son to them but I havent exactly had my head stuck in one for the last 40 yrs. but Im sure they can be figured out not just by a select few among us humans.
Good hearing from you Buddy. So hows the weather up there?