Originally Posted by
spudly12
hi there i have been offered a realy good deal on the sport promo kit 21 version can anyone tell me what plugs to use they are the standard plugs .also how do these motors compare against the ws7111
cheers inadvance
The RB WS7-III will have way better top end preformance, and the GRP will be better on the bottom end. Both engines will last for several gallons and fuel milage may be a little better with the GRP.