Translations:KAVAN AP09A - Instruction Manual/82/en
4. Always watch the exhaust during flight. The exhaust should leave a slight trail of smoke (it is often blue in colour). If the engine is too lean, it will not leave any trail.
4. Always watch the exhaust during flight. The exhaust should leave a slight trail of smoke (it is often blue in colour). If the engine is too lean, it will not leave any trail.