nitro content for GRP
hey i have a [link=http://www.amainhobbies.com/product_info.php/cPath/1_23_31/products_id/26092]Losi GRP .21 Off-Road Competition Buggy Engine (Standard Plug)[/link] and im not sure what nitro content i should use... i have 30% right know but im not sure what i should use for the new engine.