Problem adjusting ignition

[teflonharry]

Hi My JOhnson 110 hp -86 should have 28 deg BTDC .<br />Now it is 24 deg at BTDC and I cant move it more. I checked it with the boat running in 35 knots ~5100 rpm. (A friend was steering)<br /><br />Will this (24 deg) be a problem for me? Will I end up with a burned piston?<br /><br />/Harry

 

[angus63]

Re: Problem adjusting ignition

Are you sure the stop adjustment is buried??

 

[Joe Reeves]

Re: Problem adjusting ignition

(Timing At Cranking Speed 4°)<br />(J. Reeves)<br /><br />The full spark advance can be adjusted without have the engine running at near full throttle as follows. <br /><br />To set the timing on that engine, have the s/plugs out, and have the throttle at full, set that timer base under the flywheel tight against the rubber stop on the end of the full spark timer advance stop screw (wire it against that stop if necessary). <br /><br />Rig a spark tester and have the gap set to 7/16". Hook up the timing light to the #1 plug wire. Crank the engine over and set the spark advance to 4° less than what the engine calls for. <br /><br />I don't know the full spark advance setting your engine calls for, but to pick a figure, say your engine calls for 28°, set the timing at 24°. The reasoning for the 4° difference is that when the engine is actually running, due to the nature of the solid state ignition componets, the engine gains the extra 4°. <br /><br />If you set the engine to its true setting at cranking speed, when running it will advance beyond its limit by 4° which will set up pre-ignition causing guaranteed piston damage! You don't want that to take place. <br /><br />No need to be concerned about the idle timing as that will take care of itself. The main concern is the full advance setting. <br /><br />Be sure to use your own engines spark advance settings, not the one I picked out of the air here in my notes.

 

[teflonharry]

Re: Problem adjusting ignition

Hi!<br />I have tried the method of Joe and still I can not increase it more. The main question is what will happen if I run it like this?<br />If I run it 4 deg less than the full spark advance setting should be according to the manual.<br /><br />Will I burn a piston? or Do I just increase the fuel consumtion? or do I loose som hp?<br /><br />/Harry

 

[Dhadley]

Re: Problem adjusting ignition

Are you saying the stop screw for the timer base is all the way forward and cannot go any further?

 

[gary11756]

Re: Problem adjusting ignition

Hi<br /> My 1972 65 hp the timing is 8 deg at idle. is that correct. its been running very rough and has power loss.<br />Thanks

 

[teflonharry]

Re: Problem adjusting ignition

Hi again!<br />PLEASE ANWER MY _QUESTION_! <br /><br />Will the piston melt if I run it like this ~3 deg less than what is recommended according to the manual (28 deg).<br />------------------<br />The answer for Dhadley is:<br />I can't move it more.<br />It is not adjusted with any stop screw.<br />It is adjusted with a "pin".<br />The pin connects the "timer" with the gas linkage.<br />The end of the "pin" can be moved forward/backward between three holes in the gas linkage. Every "hole" moves the ignition ~3-4 deg and there is another "screw" on the linkage which will move it another 2 deg.<br />But I now I will need to buy a longer "pin" if there is any. BUT THE QUESTION IS: WILL I burn the piston?

 

[OBJ]

Re: Problem adjusting ignition

Harry.....I have the near same set up. Heres what to do. Use Joe's method. To get the timing to advance more, disconnect the spark advance rod. This is the rod that connects to the plate under the flywheel. It will pop out of the ball joint in the plate. Increase the bend in the rod so that the timing will advance more. Do this until you get 24 degrees as outlined in Joes' method. Worked for me.

 

[seahorse5]

Re: Problem adjusting ignition

I don't have one of those motors handy, but if I remember correctly, you can also turn the plastic block around and the 3 holes will be in a different position for timing adjustment.<br /><br />First things first, did you verify the timer pointer according to the service manual directions to make sure it will read exactly TDC when #1 cylinder is at TDC? If not, maybe that is why you cannot "adjust" the timing correctly.

 

[clanton]

Re: Problem adjusting ignition

Retarded timing should not burn the piston.

 

[Joe Reeves]

Re: Problem adjusting ignition

If you do indeed have your timing light connected to the #1 cylinder (top starboard), standing in back of and facing the engine, that would be the top right cylinder, remove the flywheel and check the flywheel key.