Spark plug condition

[Wetwilly62]

Plug removed after full throttle shutdown. Weak spark maybe ?

 

[F_R]

What's wrong with it? Was it running ok? Looks like deposits that were burned off during that high speed run.

 

[Wetwilly62]

What's wrong with it? Was it running ok? Looks like deposits that were burned off during that high speed run.

https://youtu.be/lZtQPGizXVE

I was moving throttle in video. To slow down and speed up.

 

[F_R]

Or carbon deposits that flaked off inside the cylinder. Had you been running any kind of engine cleaner through it? Put in a new plug and see what happens.

 

[Wetwilly62]

Or carbon deposits that flaked off inside the cylinder. Had you been running any kind of engine cleaner through it? Put in a new plug and see what happens.

Seafoamed it two months ago, new plugs since then. Coils replaced prior to this run , much improved. Can a power pack cause weak spark on one cylinder or both ?

 

[jimmbo]

I would spray a couple of cans of Engine Tuner, or Merc Power Tune through the engine. What oil are you using, and at what ratio?

 

[Wetwilly62]

I would spray a couple of cans of Engine Tuner, or Merc Power Tune through the engine. What oil are you using, and at what ratio?

Will try that , have used Quicksilver and Penzoil . Have seen no difference in them. 50:1

 

[F_R]

Seafoamed it two months ago, new plugs since then. Coils replaced prior to this run , much improved. Can a power pack cause weak spark on one cylinder or both ?

I would have to say no. But there is always that one in a million shot.

 

[Faztbullet]

Is the cooling system working as plug doesn't look like its reaching temp to clean itself. Also a pack could cause weak spark if internal capacitor is damaged or a charge coil is weak. If voltage is weak going in to capacitor its weak out to coils. Also timing not fully advancing can cause this...

 

[jakedaawg]

Personally, I would start with the basics:

1. Compression test.
2. Open air gap spark check with appropriate tester set to 7/16"
3. Fuel sample into clear jar.

Assuming that you find satisfactory results I would the go to cdielectronics.com and use their free trouble shooting guide and check each ignition component.

Following good results with that I would perform a "link and synch" as outlined in an OEM manual.

 

[racerone]

Spark was tested at 7/16" some time ago.-----Motor is still displaying unhappiness after 2 new coils were installed.

 

[jakedaawg]

Spark was tested at 7/16" some time ago.-----Motor is still displaying unhappiness after 2 new coils were installed.

Oh, I must have missed that or there was another thread maybe? A proper link and synch also? I was simply going off listening to the video...