- Location
- Washington
Spark Plug
- Thread starter Bueller
- Start date
- Location
- Ontario, Canada
Yup, you want to see a nice chocolate brown to show ideal fuel conditions...maybe consider 40:1 too. Also keep in mind the higher the octane number the slower the flame front across the piston. If you are only running around 150 psi then you should only be using 91 octane. Too slow of a burn and you will lose power but also just send raw fuel charge out the exhaust. On the opposite side of the spectrum, too low of an octane and the fuel will flash before it should causing too fast and hot of a flame front. This is known as detonation and typically will melt a hole in the center of the piston 
I run 110 and K-2 in leaf blower and weed wacker.. runs fine, smells nice. One day the leak blower started to run like poo, bogg, won't accelerate etc.. pulled the plug and it had deposits like yours, just a little more on center electrode tip..trying do yard work so I used my spark plug sand blaster and cleaned the plug.. problem gone now runs great..
thought I had a fuel issue first, was suprised it was a dirty plug..
- Location
- Washington
Good to know!! Thank you!Yup, you want to see a nice chocolate brown to show ideal fuel conditions...maybe consider 40:1 too. Also keep in mind the higher the octane number the slower the flame front across the piston. If you are only running around 150 psi then you should only be using 91 octane. Too slow of a burn and you will lose power but also just send raw fuel charge out the exhaust. On the opposite side of the spectrum, too low of an octane and the fuel will flash before it should causing too fast and hot of a flame front. This is known as detonation and typically will melt a hole in the center of the piston