Thanks, I might have to try one.
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Looking for comments from anyone running a aftermarket cdi on any LB
- Thread starter lewb
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Export threadThanks, I might have to try one.
Hi Lewb,
I re-reading through this thread, it wasn't mentioned, what is the color of the spark? Should be blue in color, yellow means it's weak. Have you checked the compression of the cylinder? I'm not sure if an engine with lower compression would cause your problem or not.
Jeff
I re-reading through this thread, it wasn't mentioned, what is the color of the spark? Should be blue in color, yellow means it's weak. Have you checked the compression of the cylinder? I'm not sure if an engine with lower compression would cause your problem or not.
Jeff
Hi Lewb,
I re-reading through this thread, it wasn't mentioned, what is the color of the spark? Should be blue in color, yellow means it's weak. Have you checked the compression of the cylinder? I'm not sure if an engine with lower compression would cause your problem or not.
Jeff
Plug color is dark black, 105 cold 100 warm, might be down some, not sure how that effects plug color. The dura force has 115 cold and the plug color is brown.
fabricgator
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I think the compression should usually be higher when warm. Everything expands and tighter clearances.
Just a thought...
I have some OMC Engine Tune. It came in both aerosol and gallon jugs. It will (supposedly) break down carbon deposits and clean the rings/ring grooves in the piston.
It is for the outboard engines. You would pulse spray it in the intake bore of a warm, running engine without stalling out, then at the end you let it flow until stall. Let it sit for an hour, then fire it up and let it burn off.
I would also go in the spark hole and spray the bore with the little aerosol tube, too.
You can get a similar product at West Marine by their 2 cyc oil display by QuickSilver.
Black and sooty is fuel related.
Oil, oil mixture, fuel, fuel additives, and/or carbureation too rich.
And, as I'm sure we know, the spark plug looking like the color of cocoa powder is ideal. (so dad taught me)
I grew up hearing about a "hotter spark plug" when your old worn engine has a greasy oily black spark plug.
10 years ago, I attended a Champion seminar at an aviation show. Turns out the hotter plug has to do with, no, not a hotter spark...
... but, the spark plugs ability to remove heat from the cylinder. Huh?!?
Turns out that they make a longer porcelain insulator snout that is less inclined to transfer the heat to the surrounding cylinder head, thus making the cylinder run a little hotter.
Just a thought...
I have some OMC Engine Tune. It came in both aerosol and gallon jugs. It will (supposedly) break down carbon deposits and clean the rings/ring grooves in the piston.
It is for the outboard engines. You would pulse spray it in the intake bore of a warm, running engine without stalling out, then at the end you let it flow until stall. Let it sit for an hour, then fire it up and let it burn off.
I would also go in the spark hole and spray the bore with the little aerosol tube, too.
You can get a similar product at West Marine by their 2 cyc oil display by QuickSilver.
Black and sooty is fuel related.
Oil, oil mixture, fuel, fuel additives, and/or carbureation too rich.
And, as I'm sure we know, the spark plug looking like the color of cocoa powder is ideal. (so dad taught me)
I grew up hearing about a "hotter spark plug" when your old worn engine has a greasy oily black spark plug.
10 years ago, I attended a Champion seminar at an aviation show. Turns out the hotter plug has to do with, no, not a hotter spark...
... but, the spark plugs ability to remove heat from the cylinder. Huh?!?
Turns out that they make a longer porcelain insulator snout that is less inclined to transfer the heat to the surrounding cylinder head, thus making the cylinder run a little hotter.