Are you looking to get more out of your Kitty Cat engine? Many enthusiasts want to unlock the full potential of these small engines, often referred to affectionately as a “Cat With Kitty” for their playful nature and size. This guide will walk you through some key modifications to boost your Kitty Cat’s performance, focusing on simple yet effective upgrades.
Unleashing RPMs: Governor Bypass and Carburetor Enhancements
The first step to increasing engine power is often bypassing the governor. The governor restricts the engine’s RPMs, limiting its top-end performance. Bypassing it allows the engine to rev higher, but this also means you’ll need to address fuel delivery. At higher RPMs, the stock carburetor can struggle to supply enough fuel, leading to fuel starvation after about 15 seconds at full throttle. To solve this, upgrading to a 2.0 needle & seat in your carburetor is crucial. This modification increases the fuel flow into the carburetor bowl, ensuring a consistent fuel supply even at higher RPMs. Make sure you source the correct 2.0 needle & seat, as variations exist.
Optimizing Fuel Delivery: Jetting Adjustments
Kitty Cat engines, even in their original configuration, tend to run rich. This means they receive more fuel than necessary for optimal combustion. While a slightly rich mixture is safer for the engine, it sacrifices performance and fuel efficiency. The stock jetting is typically 72.5 (or 77.5 on older 1977 models). To lean out the fuel mixture and improve performance, it’s recommended to change to a 70 main jet. This adjustment optimizes the air-fuel ratio for better power output across the RPM range.
Gearing for Terrain and Rider Weight
Gearing plays a significant role in how your Kitty Cat performs, especially in different terrains and with varying rider weights. For heavier riders or hilly environments, using a driven sprocket with more teeth, like a 36 or 37 tooth, is advisable. This lower gearing provides more torque for climbing hills and accelerating with heavier loads. However, for flatter terrain, you can opt for a smaller driven sprocket to increase top speed. A 34 tooth sprocket is a safe starting point for flat areas, and some even go down to 32 or 30 teeth. Going too low can lead to a noticeable loss of low-end power. When selecting sprockets, consider the quick change hub system for easier swapping. For those not racing and looking for a more budget-friendly option, re-hobbed OEM sprockets in 37 and 34 tooth sizes might be available, offering a cost-effective gearing solution.
Clutch Maintenance: Ensuring Efficient Power Transfer
The clutch is a vital component in transferring engine power to the wheels. Regular clutch maintenance is essential for maintaining peak performance. While the clutch spring is durable, it can lose tension over time, even within a short period. A weakened spring lowers the clutch engagement point, which can be critical in racing starts and overall responsiveness. For recreational use, replacing the clutch spring every couple of years is a good practice. If you’re racing, more frequent replacement, at least twice per season, is recommended to ensure optimal clutch performance and get that crucial edge off the starting line.
By implementing these modifications – governor bypass with carburetor upgrade, jetting adjustments, appropriate gearing, and clutch maintenance – you can significantly enhance the performance of your Kitty Cat engine and enjoy a more responsive and powerful ride. Remember to consult with experienced professionals if you have any questions during the modification process.
