The Navigator was the first derivative of the all-new Jubilee 250cc twin that was introduced in 1958. Designer Bert Hopwood’s original conception had called for integral cylinder barrels and ‘heads but convention won the day and separate components were used in production. Built in unit with the four-speed gearbox, the Jubilee engine was very ‘over-square’ by the standards of the day and could be buzzed to 8,500rpm, a quite exceptional figure for a British motorcycle. This modern-looking engine was installed in a Francis-Barnett derived frame with fabricated ‘down-tube’. Towards the end of 1960 the 350cc Navigator was announced. The motor was bore and stroked, while the cylinder block became a one-piece casting. Otherwise changes were few, although the cycle parts were up-rated with the Roadholder front fork and 8″ diameter brake from Norton’s ‘heavyweight’ models, and the overall gearing raised to exploit the larger engine’s increased power. Motor Cycling achieved a top speed of 89mph with a Navigator Deluxe with its enclosed body, which also returned a commendable 56mpg during the high-speed test.
The 350cc Navigator on offer here comes to us from a local Southern California enthusiast and collector, looking to thin the herd. In very good to excellent overall condition, the bike was recently recommissioned to ensure it rides as well as it looks. A “gentleman’s” motorcycle, it is smooth and cosseting in its approach to the road. A wonderfully rewarding ride.
Engine no. 99860 19
Location: Ventura, California
SOLD
