The EPA has approved the use of cylinder base spacers for use of leaded regular gasoline on motorcycles produced after January 1, 1978.
In my BMW franchise shop, we had been doing this for years, especially on the R60/5 & R60/6, due to pinging.
Duane Ausherman BMW motorcycles
What I can remember after decades of working with BMW motorcycles
The EPA has approved the use of cylinder base spacers for use of leaded regular gasoline on motorcycles produced after January 1, 1978.
In my BMW franchise shop, we had been doing this for years, especially on the R60/5 & R60/6, due to pinging.