The difficulty in pull-starting some modern motorcycles can be attributed to a few factors:
Electric Start Systems: Most modern motorcycles are equipped with electric start systems, which eliminate the need for manual pull-starting in most situations. Electric starters provide convenience and reliability, allowing riders to start their motorcycles with the push of a button. As a result, manufacturers may not prioritize optimizing pull-starting mechanisms on these models.
Compression Ratio and Engine Design: Modern motorcycle engines often have higher compression ratios for improved power and fuel efficiency. Higher compression means there is greater resistance in the cylinder when trying to turn the engine over manually. This increased resistance can make it more challenging to pull-start the engine compared to older models with lower compression ratios.
Fuel Injection Systems: Many modern motorcycles utilize fuel injection systems instead of carburetors for better fuel delivery and performance. Fuel injection systems require precise fuel-air mixtures and specific engine conditions to start successfully. Pull-starting may not provide the necessary conditions for the fuel injection system to function optimally, leading to difficulties in starting the engine.
Safety and Liability Considerations: Manufacturers design motorcycles with safety and liability in mind. Pull-starting a motorcycle requires physical effort and can be potentially hazardous if not done correctly. In an effort to reduce potential accidents or injuries, manufacturers may have intentionally made pull-starting more difficult to discourage improper or unsafe starting procedures.
It's important to note that while pull-starting may be challenging on some modern motorcycles, it is typically a backup method for starting the engine when the electric starter fails or when the battery is dead. If you're experiencing difficulties with starting your motorcycle, it's recommended to consult the owner's manual or seek assistance from a qualified mechanic to diagnose and address the issue properly.