MF 165 engine trouble

CK MO

New User
Working on a MF 165, Perkins gas engine, starts up fine and after about a minute it starts fluttering, when I pull off the number 2 plug wire it seems not to change anything. Have rebuilt one carb and switched out to another, changed the points, cap, rotor, and plugs and moved plugs and the wires and it doesn't move the problem. Today pulled valve cover and checked the rocker arms and valve train all seems fine, compression on that cylinder is down about 8-10 psi from the other 3 cylinders. Has me scratching my head, any ideas would be greatly appreciated.

Thank You
CK
 
What heat range are the plugs? If tractor does not work hard I'd put hotter plugs in it to help prevent gas fouling that cooler plugs can sometimes do. On the MF Perkins gas forklift I had trouble until I put in the hottest plugs I could find. A weak or gas fouled plug won't fire under compression, but will look fine when checked outside. Probably why I REALLY prefer diesels...
 
if you let it sit does it run ok when you start it back up without doing anything ?
clogged fuel line starving the fuel?
possible running to rich when the engine warms up?
 

I inhertited my fathers 135 with perkins 3cyl gas and it gave me quite a lot of issues. They are a good engine but seem very picky when not running properly.

As mentioned above if multiple carbs act the same check fuel supply. Take fuel line off carb should be a steady supply of fuel.

Check ign timing should be 12 deg at idle

I had a miss at 1500rpm and random flooding at start up after putting timing light on each plug wire and cranking engine to observe spark I found #3 plug to be very inconsistent and was one of my issues. This may also point you to a weak coil. You can also buy inline spark testers fairly cheap that will light up when plug fires and can be used while engine is running.
 

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