Just joined the GRA having been bought a 1961 250 Sports Twin by my wife for my 70th birthday.
It's been beautifully restored including a complete engine rebuild by Villiers Engineering Services in 2011. Looks lovely, but just won't run properly. Starts fine, ticks over fine, revs up if you only open the throttle a wee bit, but dies completely as soon as you open the throttle wider. Often oils up the LH plug and runs on one cylinder.
So far I've changed the plugs, emptied and flushed the tank and refilled with fresh fuel, stripped and cleaned the carburettor (which was clean as a whistle anyway), checked and cleaned the points (which look like new). Did notice one set of points arcs a lot, the other doesn't (?condenser)
Now run out of ideas.
Had hoped to ride the bike, but looks like I've got a very expensive ornament at the moment.
Any ideas would be very welcome.
It's been beautifully restored including a complete engine rebuild by Villiers Engineering Services in 2011. Looks lovely, but just won't run properly. Starts fine, ticks over fine, revs up if you only open the throttle a wee bit, but dies completely as soon as you open the throttle wider. Often oils up the LH plug and runs on one cylinder.
So far I've changed the plugs, emptied and flushed the tank and refilled with fresh fuel, stripped and cleaned the carburettor (which was clean as a whistle anyway), checked and cleaned the points (which look like new). Did notice one set of points arcs a lot, the other doesn't (?condenser)
Now run out of ideas.
Had hoped to ride the bike, but looks like I've got a very expensive ornament at the moment.
Any ideas would be very welcome.
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