Posted by Steve@Advance on January 13, 2020 at 04:56:35 from (24.182.105.128):
In Reply to: cub 184 power issue posted by farmer rock on January 12, 2020 at 18:51:50:
The jumping is likely a misfire. Check the spark quality at the plug end of each wire. It should jump 1/4" to ground, blue hot spark. Replace the plugs just to say you did. If it has points, check the gap and check the distributor shaft for side play. A worn distributor or improperly gaped points will do just what you are describing. Check for vacuum leaks.
Check the fuel flow through the carb. Pull the drain plug on the bottom of the carb, it should have a good continuous flow, not slow to a drip or stop flowing. If the main jet is adjustable, it may be too lean, especially if a partial choke helps it run better.
An easy test for the governor, with the engine off, throttle set for fast, the carb throttle plate should be spring loaded in the full open position. Start the engine, set the throttle for idle, suddenly push the throttle lever to full speed, watch the carb throttle plate. It should go full open, then modulate back as the engine speed comes up. If these things are happening, the governor is doing what it should. Surging is usually a symptom of a too lean mixture.
If the jumping persists, run a compression test. Should have 90+ PSI and all cylinders be relatively close to the same. If any are low look the valve train over, check for stuck valves, tight valve lash, broken springs, bent pushrods, rockers not moving to fully open a valve. If all checks good, could be a leaking valve, blown gasket between cylinders.
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