Idle Unstable and Burn Glow Plug. Help!!

My engine is Mega 21ZX (orange head) with Nova Rossi C7TF glow plug + 0.5mm washer + 25% fuel.

Help! Help! Help!

Problem 1. Once the temperature of the engine heated over around 100C and after I pressed the full throttle, the engine take around 10 seconds to be stable. Within this period, the speed is "high-low-high-low". I tried to screw in the "small needle". But it is not much improved.

Problem 2. The Glow Plug is burned half tank of fuel. The glow plug is broken in the inner part. Is the compression ratio too high? Is it related to Problem 1 if I screwed the small needle too lean?

Thank you for helping.

for the problem 1 , frist  u need to change a new glow plug  . and make sure the air way of the carb is normal , sometimes  the  carb will have leak of air (may be the O ring of all the needle are old) and also the exhaust pipe,....   this kind of problem may be cause by several factors......eg. engin condiction,  glow plug , fuel tube , leak of air. overheat ,and also the engin setting,   and u may need to know the exact temp , .something the thermomter are not accurate.


for the both problem i think it is the temp problem ,may be the thermomter are not accurate.

第一要做的事是換回mega火咀先,火咀係要跟機的.唔好亂黎!

hai wo .........Mega can`t use nova glow plug ga wo .....haha

I noted that I cannot use NovaRossi in Mega in this forum. But the shopkeeper of "Global" model told me that they don't Mega glow plug in stock and NovaRossi glow plug is suitable for Mega ZX engine too ......

In fact, I saw some fuel in brown is bubbled around the glow plug after the engine is heated up. I have to hardly turn in the glow plug then.

When can I buy Mega glow plug?