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Old 06-02-2007 | 04:27 PM
  #17  
Tired Old Man
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From: Valley Springs, CA
Default RE: 3mmtoc53cc vs dl50

3DDino;

Do you have a means of checking the ignition timing? What you describe sounds very much like the timing ring has slipped a little and retarded your timing. You have a CH ignition system so obtaining instructions is quite easy by going to ythe CH website and downloading their full instruction set. You may already have them since they are included with every CH ignition unit shipped. Your location makes returning the engine for a timing check most impracticable and quite expensive.

Set up the protractor provided in the instructions and like the instructions state, use a simple metal rod clamped to the head as a pointer. Remove the spark plug from the engine, keeping the plug in the plug wire and the ground strap in place. Don't turn on the ignition yet, and whenever you do turn it on be absolutely certain that the side of the spark plug base maintains contact with the engine. You do not want the ignition to discrage unless the plug is in contact with the engine!!

Now that the plug is removed and the protractor and rod are mounted on the engine, rotate the prop hub to find the pistons' top dead center position. That will be the location where the piston is at it's highest point inside the cylinder. A dial indicator is the best way but you can get close enough by marking a small stick inserted through the spark plug hole. Do this a gfew times to be reasonable sure you have the right position. Now without rotating the piston, move the pointer you made to the zero position of the protractor that's mounted on the prop shaft. You just determined and marked the starting point of the timing process.

Now, maintaining contact between the plug and the engine, turn on the ignition. Rotate the prop shaft and see where the plug fires relative to the pointer position over the protractor. It should be between 28 and 30 degrees advanced (before) of the zero mark. If it's not, and I strongly suspect it is not, then simply loosen the two set screws in the timing ring and rotate the ring to obtaing the correct timing. Before moving the ring, make a note of how far the timing ring is forward of the crankcase. That's important because the hall sensor has to be placed correctly relative to the magnet and it's possible to have the ring too far back, making for a bad reading with the sensor. If, after moving the ring, you can't get the igniton to discharge, simply move the timing ring forward a mm or two and try again.

One last thing, again. Make sure the spark plug maintains contact with the engine head or case in some manner whenever you turn on the ignition. Failing to do so can fail the ignition. That's the only hard part of the entire process. It's called being careful. It's an easy job and I'm pretty sure that after you check the timing you'll have a completely different engine to play with. Mine was shipped the same way originally and after the correction the results were what JEFFRO503 described. Mine was the first Taurus seen at his field.