▁D F V , ▁but ▁used ▁two ▁Am al ▁car b ure tt ors , ▁rather ▁than ▁the ▁fuel ▁injection ▁of ▁the ▁D F V . ▁The ▁car b ure tt ors ▁and ▁angle ▁in ▁relation ▁ham per ed ▁fuel ▁delivery ▁and ▁power ▁output . ▁ ▁D yn o ▁testing ▁showed ▁that ▁the ▁P 8 6 ▁developed ▁ 9 0 hp , ▁down ▁on ▁the ▁project ed ▁ 1 0 0 hp , ▁while ▁the ▁massive ▁amount ▁of ▁rot ating ▁weight ▁inside ▁the ▁engine ▁( counter ▁bal anc ers ▁and ▁fly w heel ) ▁h inder ed ▁thro tt le ▁response . ▁The ▁overall ▁weight ▁of ▁the ▁engine ▁meant ▁that ▁it ▁was ▁never ▁to ▁going ▁to ▁be ▁as ▁light ▁as ▁equivalent ▁engines ▁from ▁Japanese ▁manufact ur ers . ▁The ▁bel t ▁driven ▁timing ▁system ▁was ▁in ac cur ate , ▁while ▁the ▁bel ts ▁themselves ▁were ▁frag ile ▁and ▁pr one ▁to ▁breaking .. ▁ ▁The ▁P 8 6 ▁was ▁fitted ▁in ▁a ▁N orton ▁' fram eless ' ▁ch ass is ▁that ▁made ▁its ▁racing ▁debut ▁in ▁ 1 9 7 5 , ▁but ▁results ▁were ▁poor , ▁due ▁to ▁the ▁lack ▁of ▁power . ▁When ▁N orton ▁Vill iers ▁Tri umph ▁was ▁split ▁up ▁in ▁ 1 9 7 6 , ▁an ▁off sh oot ▁company ▁called ▁N V T ▁Engineering ▁dis band ed ▁the ▁testing ▁and ▁racing ▁depart ments , ▁and ▁the ▁existing ▁b ikes ▁and ▁spare ▁engines ▁( 3 0 ▁in ▁total ) ▁were ▁sold ▁off . ▁ ▁The