▁ 1 9 6 6 . ▁ ▁Development ▁La unch ed ▁in ▁ 1 9 6 0 ▁at ▁the ▁Ear ls ▁Court ▁Motor cycle ▁Show ▁the ▁N avigator ▁was ▁a ▁development ▁of ▁the ▁N orton ▁J ub ile e . ▁The ▁engine ▁was ▁en larg ed ▁in ▁bore ▁( from ▁ 6 0 ▁to ▁ 6 3 mm ) ▁and ▁stroke ▁( from ▁ 4 4 ▁to ▁ 5 6 mm ), ▁to ▁give ▁a ▁capacity ▁of ▁ 3 4 9 cc . ▁The ▁cyl ind ers , ▁separate ▁on ▁the ▁J ub ile e , ▁were ▁now ▁a ▁single ▁casting ▁to ▁improve ▁oil ▁ret ention , ▁but ▁the ▁cyl inder ▁heads ▁continued ▁to ▁be ▁separate . ▁N orton ▁Road holder ▁for ks ▁and ▁eight - inch ▁bra kes ▁were ▁fitted ▁to ▁replace ▁the ▁J ub ile e ' s ▁light weight ▁front ▁end . ▁The ▁down ▁t ube ▁on ▁the ▁frame ▁was ▁st iff ened ▁to ▁improve ▁handling ▁and ▁deal ▁with ▁the ▁power ▁increase ▁to ▁ 2 2 b hp . ▁▁ ▁The ▁top ▁speed ▁was ▁recorded ▁at ▁over ▁, ▁and ▁the ▁factory ▁persu aded ▁Harold ▁D ani ell , ▁the ▁Is le ▁of ▁Man ▁T T ▁rac er ▁who ▁named ▁the ▁N orton ▁Fe ather bed ▁frame , ▁to ▁enter ▁a ▁standard ▁N orton ▁N avigator ▁in ▁a ▁race ▁at ▁Silver stone ▁race ▁track ▁where ▁it ▁recorded ▁ ▁on ▁the ▁straight ▁with ▁only ▁minor ▁car b ure tt or ▁modification . ▁ ▁The ▁ 1 9 6 0 ▁model ▁was ▁still