Dual plug specs?

[puccini]

Anyone know what the recommended plugs are for a dual plug conversion on an R75/7.

Anything on line?

[28796]

Depends if the lower plug holes were drilled for a standard size spark plug or one of the smaller ones. My dual plugged R90/S uses NGK BP6ES (long reach) on top & NGK BP6HS (short reach) on the bottom. These would work well in your R75 if the lower hole accepts the same size plug as the stock plug.