In case the problem is still there.
Visit a reliable mechanic and request for a distributor overhaul Only. He will remove the assembly from engine and dismantle it completely. wash it with petrol & soft brush, the springs for centrifugal weights must be DONE, if not then after reassembly change the point, scrub the rotar metal softly, Clean NOT SCRATCH the centre carbon and 3 pins in distributor cap.
IF anything appears damaged broken change the complete distributor assembly - Buy a GENUINE from Suzuki shop not from JUNK yard.
do come back & post on forum how you managed to get rid of problem