reading spark plugs

**redsnapper386** · 10-14-2019, 05:18 PM

guys i have a 1993 2.5 v6 200 hp motor while changing spark plugs i noticed no 1 3 5 2 looked clean but no 4 & 6 were black carbon is this a possible carb adjust or some other issue thanks

**Merc 2.5** · 10-16-2019, 04:31 AM

Should all look the same , with maybe very slight differences. is it a stock mota. What kinda plugs u got?

**redsnapper386** · 10-17-2019, 02:03 AM

Originally Posted by Merc 2.5

Should all look the same , with maybe very slight differences. is it a stock mota. What kinda plugs u got?

yes mota is stock,ngk plugs buh8.thanks

**Merc 2.5** · 10-17-2019, 05:58 AM

Those plugs cant b read accurate, if u wanna good read on em ,get br8hs-10 gapped round 40.

**JR IN JAX** · 10-17-2019, 11:36 AM

The way I have found to best measure mixture is to use my USB/HD/Lighted/color Endoscope [15' long/$15.00 from China] going through the sparkplug hole to read the flame pattern on top of the pistons.
You will learn a lot and can check the cylinder walls without removing the heads.

**redsnapper386** · 10-19-2019, 10:07 PM

Originally Posted by JR IN JAX

The way I have found to best measure mixture is to use my USB/HD/Lighted/color Endoscope [15' long/$15.00 from China] going through the sparkplug hole to read the flame pattern on top of the pistons.
You will learn a lot and can check the cylinder walls without removing the heads.

thanks guys good stuff