Situation
The engine speed did not get high smoothly with hunting.
Cause
Faulty Ignition coils
Maintenance
At first I changed new spark plugs and new HT leads.
Then the engine worked properly on a temporarily.
After 1 month it happend again.
This engine was used concurrently ignition coils system.
So I judged that sparks were leaking in the ignition coils.
I exchanged new ignition coils.
