TWO STROKE PINKING PINGING

[AIRMANBEAR]

MY 1974 MZ TS 250 HAS A SERIOUS PINGING OR PINKING PROBLEM AT SPEEDS OVER 90 KPH I HAVE TRIED EVERYTHING FROM BIGGER JETS, RAISING THE NEEDLE, RETARDING TIMING , HIGHER OCTANE FUEL, COOLER PLUGS, MORE PISTON CLEARANCE, CLEANING THE CARBON OFF THE COMBUSTION CHAMBER.. AND NOTHING WORKS...... ANY HELP ???????????? WOULD BE APPRECIATED...........
ED USA

[DAVID THOMPSON]

have you tried pure gas
http://pure-gas.org/

my rt125 runs great now that i started using it last year
dave

[pmorris4562]

If you have carbon deposits in your exhaust, I believe they can get hot enough to glow and therefore cause any unburnt fuel reaching the exhaust to ignite actually in the exhaust. Could this be your problem?