firing problems case SC

[heenk]

Only cylinder 1$2 fire 3$4 do have a spark. Magneto has been set up with the mark on the fly wheel. Another magneto was installed and has the same problem that 3$4 don"t fire.
What could it be.

 

[Anonymous-0]

check to make sure the exhaust and intake manifold is not burned thru ,and therefore sharing gasses ,, This happened to 2 of My SC's that have wandered up the driveway ,, Post this on the CASE forum ,, Good Luck , Jim

 

[heenk]

Just tried something else there are 2 vacuum bolts on the air intake. remove the one between cylinder 1$2 and the tractor stolls.Remove the one between 3$4 and the rpm go up.
maybe this helps to solve the problem.