Read My Plugs

[Q Tip]

Ok these were brand new BP7ES NGK's that I have put 126 miles on since getting my '79 back on the road. The bike had set up unridden the better part of 2 years prior.

This is not a plug chop per se but I did chop the plugs twice in high gear at about 50mph and they looked the same as far as I could tell.

The lefthand plug in the pics is the left cylinder.

Whatcha think?

 

[Q Tip]

Also the bike has VM34's and returned 43.4 mpg.

 

[Patches]

The right looks pretty darn good. Left maybe a little rich. But I would be happy with them if it was me.

 

[retiredgentleman]

Right plug is perfect.

Left side..................check if the float level is too high.....................do a "dead cylinder" adjustment of the mixture screw.

 

[5twins]

Yes, the left one is rather rich. The smoke ring is too high up on the porcelain and the color is a bit dark.

 

[Q Tip]

thanks so much I will look into it.

 

[OakBehringer]

Timing is off. Color change on strap is too low.

 

[jay760]

timing might be out, the carbs might need balancing,

 

[DirtyErnie]

left goes rich just off idle, right goes lean. both look a little dark at high load.
Check timing, balance carbs, re-shoot with new plugs :-D

 

[Q Tip]

Timing should be about perfect, just set with a light. Won't hurt to check it though. Carbs need further adjustment they have been set only by ear and "eyechrometers".

 

[DirtyErnie]

Any news?

 

[Q Tip]

I chopped the plugs at freeway speed and they had a light dry coating of black soot on the curved metal strap part. I set the air/fuel mixture with the dead cylinder method again, and if anything the left side looked a tad richer even.

I feel like I need to iron out a few details like getting an exhaust vs. my open pipes, repairing a leaky vacuum petcock, and checking the carb synch out with a manometer before I mess with the plugs much more.

Overtime at work is WAY down which is really crimping my style with this build. Just trying to save what i can at the moment.