Posted by Steve@Advance on March 14, 2017 at 19:45:17 from (66.169.147.211):
In Reply to: Massey Ferguson 135 posted by Norm Wampler on March 14, 2017 at 17:36:59:
The backfiring, are you talking about exhaust backfire?
If so, that is usually a sign of intermittent ignition problems, loss of spark, weak spark, or erratic spark. Todays aftermarket points and condensers are known to be bad out of the box. Could also be a weak or wrong coil, bad electrical connection, even a bad ignition switch.
Backfiring out the carb?
This can be lean mixture (try partial choke), retarded ignition timing, stuck centrifugal advance, cross firing (wet distributor cap, weak plug wires), flat cam, bent pushrod, other valve problems.
As for the fuel system, has an inline fuel filter been added? That can be too much restriction for a gravity flow system. The fuel line should be steel, routed as directly down hill to the carb as possible, as far from the exhaust as possible. There is a drain plug in the bottom of the carb. With the fuel valve on, remove the plug, catch the fuel in a clean glass. The flow should start as a full stream, then slow to a trickle as the bowl empties. The flow should remain a trickle, not slow to a drip or stop. Some carbs have a second filter screen in the inlet fitting before the needle valve. Look at what was caught in the glass, if there is any contaminate, the same will be in the carb. It may need to be disassembled and cleaned, a simple job, probably won't need a kit if you can save the gasket.
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