There could be several reasons why your Suzuki Gixxer 155cc motorcycle may not be delivering much power in 5th gear. Here are a few possible explanations:
Gear ratio: The gear ratios in different gears determine the power and torque delivery of a motorcycle. It's possible that the gear ratio in the 5th gear of your bike is designed to prioritize fuel efficiency rather than outright power. This can result in the bike feeling less powerful in the higher gears.
Engine performance: If your motorcycle is not tuned properly or if there is an issue with the engine, it can affect the power delivery in all gears, including the 5th gear. Factors such as fuel delivery, ignition timing, or air intake problems could be causing the lack of power.
Clutch slippage: If your clutch is worn out or not properly adjusted, it can lead to clutch slippage. Clutch slippage occurs when the clutch fails to engage fully, causing a loss of power transfer from the engine to the wheels. This can be particularly noticeable in higher gears where more power is required.
Chain and sprocket condition: A worn-out or improperly maintained chain and sprocket can lead to power loss and reduced performance in higher gears. If the chain is loose or the sprockets are worn, it can cause inefficient power transfer, resulting in reduced power in the 5th gear.
Aerodynamic drag: Higher gears tend to expose the motorcycle to higher wind resistance, which can create more aerodynamic drag. If your bike has a significant wind resistance issue, it may feel like it's lacking power in the 5th gear due to the increased drag.
If you're experiencing a consistent lack of power in the 5th gear, it's recommended to have your motorcycle inspected by a qualified mechanic. They can diagnose the issue more accurately and provide the necessary repairs or adjustments to restore the power delivery.