i have the same problem with the s3 and s1's my cure was to run the bottom lean and and keep the top rich! once you cleaned out your carby set it to these settings
bottom end: 1 1/8 from in
top end: flush with outer brass tubing
mind: have it set flush with outer carby barrel, but my s3 wont run properly at all unless i run it a little leaner than usual, remember every carby could be made different and each needle require a different setting than any other.
use this info below it is very help full.
Hot glowplug guarantees a better adjusting of the engine at low RPM while the cold glowplug gives a better performance at high RPM. If you have a cold glowplug on your engine and have difficultes to keep it regular at low RPM, we advise you to make the base speed a little higher. In case the engine goes out again, we advise you to replace the above mentioned glowplug with a cold one; these difficulties in the carburation aren't due to a bad running-in of the engine but to anomalous climatic and meteorological conditions (see high degree of humidity, altitude, low pressure, etc...).
Technical specifications of turbo glowplugs
Turbo glowplug was conceived to give to the engine higher performance and it is available in 8 versions: 4 hot and 4 cold.You find here with a description schedule that gives to the drivers the possibility to choose the suitable glowplug according to the situation he is operating.
here is a recomended novarossi turbo glow plug chart for temps and correct plugs:
Type Features Nitro % Increase
C.5 TC Hot with hot
filament 10-20% + 10% from 5°
C.6 TC Hot with average
filament 10-20% + 8% from 5°
C.7 TC Hot with cold
filament 20-30% + 6% More than
C.8 TC Hot with very
cold filament 20-30% + 5% More than
C.5 TF Cold with hot
filament 20-30% + 15% from 10°
C.6 TF Cold with average
filament 20-30% + 13% More than
C.7 TF Cold with cold
filament More than
20% + 12% More than
C.8 TF Cold with very
cold filament More than
20% + 10% More than