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Ford 9N, 2N & 8N Discussion Forum

Check the compression and if

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Author

Rob

10-01-2004 03:30:21

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more than 140psi then remove the head and clean the carbon.
If you're getting excessive carbon you might be running a rich fuel mixture. Turn the main adjuster in 1/8-turn and goose the throttle 1/2-full to see if the engine stumbles. If it doesn't stumble do another 1/8-turn. When you get it where you like it then get in the seat, put it in 4th gear, lightly hold on the brake, let out the clutch to just rolling forward, and then quickly move the throttle to 1/2-full as you bear down on the brake to load it. It should come up without stumble and a nice little bit of regular spark knock but not too much. Stumble = too rich; too much spark knock = too lean. "Clatter" is too much spark knock.
Run it 10 or 20 hours and pull the plugs to check the color. You would like to get away from the black but not go to white. You're final adjustment might be as little as 1/16-turn of the main adjust this way but you can get top performance with maximum power and very little to no carbon. Save on that $2 gas, too.

Maybe you're burning oil.

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