When you experience a kickback and a popping sound while kick-starting your motorcycle pit bike, followed by an inability to kick-start it again, it could indicate a few potential problems. Here are some possible issues to consider:
Engine timing issue: A kickback and popping sound can occur if the engine's timing is off. This could be caused by a misaligned or damaged timing chain, a jumped timing gear, or incorrect valve timing. When the timing is disrupted, it can cause the piston to fire at the wrong time, resulting in a kickback and difficulty kick-starting the engine.
Ignition system problem: A malfunctioning ignition system can also cause issues with kick-starting. If the spark plug is fouled or damaged, it may not generate a strong spark, leading to a poor ignition and difficulty starting the engine. Check the spark plug condition and ensure it is clean, properly gapped, and in good working order.
Compression problem: Insufficient compression in the engine can make kick-starting difficult or impossible. This can be caused by various factors such as worn piston rings, cylinder damage, or leaking valves. If the compression is too low, the engine may not generate enough power during the kick-starting process.
Carburetor issues: Problems with the carburetor, such as a clogged jet or improper fuel-air mixture, can affect the engine's ability to start. If the carburetor is not supplying the correct amount of fuel or air, the engine may struggle to ignite during kick-starting.
It is advisable to have a qualified motorcycle mechanic or technician inspect your pit bike to diagnose the specific issue. They can perform a thorough examination of the timing, ignition system, compression, and carburetor to identify the root cause and carry out the necessary repairs.