[CFM-Z440]

Forget trying to read a spark plug with modern day pump gas. The spark plug is only valuable if you kill it immediately after running wide open for about how long it would take you to pull through 5th gear. Then you have to cut the threads off to read it. Even then, it will be hard for most people to read.

Instead, concentrate on how it runs. Obviously if it runs better with a 150 than it did with a 155, your going the right direction. Its all about trial and error even though its a pain.

However, before you go that far, I think there is something wrong if it is acting up when you turn. I would check your float level before doing any more jetting to verify that its correct. You may have bent the float or something while you were in there. Float level will affect your jetting, so it needs to be correct before anything else.