Hello guys,
We have same problems with defect coils on MOKI radials in France, even on brand new engines.......
and the After Sales -no- Service is terrific .........
To solve definitely problem with the black grease coming into the tube between the front of the engines and the WALBRO
WT carburetor ( and kill the pressure/depressure fuel pump....) I have upgraded engine with RCEXL electric fuel pump
and a upgraded carburetor with back fuel line to the tank. Follow my Facebook webpage " Modelisme Micromoteurs Service"
Video avaiable also on YouTube :
https://www.youtube.com/watch?v=O0T9YkRnk04