Opinions on Spark Plug

[mbogosia]

I recently did an airbox mod and added an HMF slip on to my 1999 Warrior. I jetted it with a 150 main at first but my plugs were black so I went back to the 145. This picture is after a good 1.5hrs of riding. The tip is brown but the rest is black. Is this acceptable? Kinda weird that I did not have to jet isn't it?

 

[tjrap350]

Well im not an expert but to me it looks pretty good. how do you like your hmf pipe?

 

[mbogosia]

The pipe is really nice. I can easily pop a wheelie in first gear and I can also get it up in 2nd now. Before I had to put my foot on the 6 pack rack and have it timed just right while in first. It also sounds way better. Nice low mean growl.

I think I just found my answer. http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

 

[dave76]

Looks good but seems just a bit lean, try the 147.5 and if it's still black then stick with the 145.