d6 9u pony carb

Ive finally had a d6 come my way. But ive run into pony issues it backfires thru the exhaust and slobbers and studders. :frusty:
I pulled the carb and cleaned amd reassembled it setting the screws at one turn out.
pulled the mag to check the timing and found the (M) marks to be way off. Rolling no 1 cyl to tdc on comp makes a yellow mark on the idler gear line up with one on the housing and the mag will index to fire on no 1 cyl on the mark. ( Im just not shure its timed right)



1 What is the proper way to adjust the carb. (mine has one screw on top and one on the side)

2 What is the proper way to time the mag?



Thanks in Advance for all input.

Sounds like you have the magneto timed correctly. If you had the timing gear cover off the engine, you could see the complete set of marks that align all at TDC of compression stroke on left #1 cylinder. The last set are between idler gear and magneto drive gear and should be marked "M". Look at the magneto gear and the marks should be aligned in about the 8:00 position.

The magneto has marks on both the arrestor plate and the coupling that engages the magneto gear. Turn the mag backwards to align the mark and the install the mag. The magneto rotor button should be pointing to the spark plug wire terminal for #1, again at about 8:00.

The initial adjustment on the carburetor is 1 turn out on the high speed needle and 1/2 turn out on the idle mixture. Remember the idle mixture screw controls the air that mixes with a set rate of gasoline flowing in the idle circuit. So turn it in to richen the mix and out to lean.

The high speed mix works "normally", in to lean, out to richen.

I am betting fuel delivery problems. If you have good flow into the carb bowl, richen it up and if it still backfires, take the bowl off and drill the soft plug on the bottom corner of the bowl which makes the connection between the high speed mixture jet and the high speed metering well passage under the hex head plug near the cast iron carubretor body. The one I did recently acted similarly, backfiring and blew the old thin exhaust manifold apart in several places! Reamed the passage across the bottom of the bowl and it runs great now.

D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄