Originally Posted by
JOEHULL
Fellas, I have been tuning and running O.S. Engines for over ten years and this is the first engine I wanted to smash with a hammer. I bought the new .21 vspec and cannot after 2 gallons get it tuned.
I bought the new Ninja and its perfect even though it has the same carb as the vspec, there are no problems with it.
JOEHULL
You probably know more about it than me, but My spec had a bad front bearing and a cracked case..Check both