1986 Force 85 Jumping / Kicking while running

[kevinstan]

I have been doing some research and cannot put my finger on it yet. When the motor is on and running it has a kicking action that also makes the motor jump when it does it. I am trying to upload a video for better reference, but that's about the best I can explain it. I thought at first from reading online that it could be the dog clutch, but mine does it while in neutral - and not engaged. I am going to replace the spark plugs today, but what else could cause this kicking and jumping / spitting action ?

 

[Jiggz]

It could be the timing. This could be caused by a sheared key on the flywheel. To check remove plug on top cylinder (#1), place a screw driver long enough so it doesn't sink all the way and rotate the flywheel by hand and mark the TDC (this should be the highest travel of the inserted screwdriver). Now verify the markings on the flywheel to make sure the TDC marking is aligned with the timing marker.

If TDC is aligned and correct, the next option is to check for compression on all three cylinders. And then check plugs for water intrusion. If there's water intrusion, plugs will be cleaned compare to the other plugs.

 

[jerryjerry05]

Maybe the air/fuel mix screws are too far in?
There are 3 on the carbs.
What are they set at?

 

[kevinstan]

jerryjerry05: I can see where the screws are on the carbs but I don't know anything about the settings for them. Could I undo them a little at a time while its running to see if it helps any? I don't want to mess anything up trying it.

 

[Jiggz]

You sure can adjust them while it is running although it is far safer doing it while the engine is off. To ensure you can always go back where it's at originally, marked all three and take pics if needed. However, adjustment should be made very slowly (virtually a hairline at a time or 1/8 of a turn) and give the engine time to adjust to the new settings.