What causes the idle vibration of the Jog-I?

[OLuna]

Jog-I idle vibration may be caused by the following reasons: Carburetor issue: If the carburetor has not been cleaned for a long time, it may lead to unstable idle speed. Engine air leakage: Slight air leakage in the engine can also cause unstable idle speed in motorcycles. The reasons for air leakage can vary, such as overly tight valve clearance, poor sealing at the connection between the carburetor and the cylinder, or damage to the secondary combustion pipe in China III models, all of which can result in engine air leakage. Ignition system failure: Minor damage to the ignition system. In this case, although the vehicle can still start, it may exhibit unstable idle speed similar to a carburetor malfunction.

[LucasLynn]

My Jog-I also had idling vibration before, which made riding very uncomfortable. There are quite a few common causes, such as worn-out or carbon-fouled spark plugs leading to poor ignition; ignition coil leakage or poor contact may also cause vibration; loose engine mount screws or aged damping rubber bushings can transmit vibrations to the frame; additionally, dirty fuel injectors or clogged fuel filters—these fuel system issues are also common. I remember one time when the idling vibration was severe, and after inspection, it turned out to be a spark plug issue—replacing it fixed the problem. A stuck idle valve due to carbon buildup can also cause this and needs cleaning. I recommend first checking if any screws are loose, cleaning the throttle body, and trying a new air filter. If that doesn’t work, take it directly to a professional motorcycle repair shop to test the ignition and fuel systems with diagnostic equipment. Don’t delay fixing this issue—severe vibration makes riding unsafe and can damage the engine’s lifespan, leading to more costly and time-consuming repairs later.

[MacDaisy]

The Jog-I keeps shaking at idle, it's so annoying. I'm fed up with it since I often commute by bike. It might be due to poor fuel quality causing unstable air-fuel mixture, a dirty air filter restricting airflow, or throttle body deposits causing airflow fluctuations. If the idle control valve is stuck or worn out, it can also make the RPM fluctuate and cause shaking. Don't randomly tamper with engine components; first, try adding a bottle of fuel cleaner and take a ride to see if it helps. Or you can remove and clean the air filter yourself to save some money. Severe shaking can make your hands numb and easily distract you, leading to dangerous situations. Take my advice: go to the service center early for a thorough check-up, replace the spark plugs, adjust the idle screw, etc. Don't wait until it stalls halfway and regret it. Regularly changing the oil filter and using good quality oil during maintenance can reduce such issues.

[SanAdam]

Common causes of idle vibration include: ignition system failures such as melted spark plug electrodes or damaged high-voltage wire insulation; fuel supply issues like clogged fuel injectors; restricted air intake due to dirty air filters; carbon buildup on the idle valve or throttle body; and loose engine mounting points exacerbating vibrations. It is recommended to use diagnostic tools to scan for trouble codes for quick identification. Seek professional inspection and repair early to prevent engine damage.