4AGE 20V ITBS NO FURTHER A MYSTERY

A little bit throttle to 50 % throttle isn't any difficulty and will not likely give vibrations btw. I'm accomplishing 28 mpg max now with quick driving and in some cases reving to max 7k, but only from time to time!See the final two photos to indicate the valve since it matches onto The top. A very modest bit of the top plastic protect needs to be