Yes, it is possible to change the sprockets on your Harley Davidson motorcycle to modify its performance characteristics, including increasing its top speed. By installing larger sprockets on the motorcycle, you can effectively change the gear ratios, which can result in higher speeds at the expense of acceleration.
When changing the sprockets, it is generally recommended to consider both the front (countershaft) and rear sprockets for optimal performance. Increasing the size of the front sprocket (having more teeth) or decreasing the size of the rear sprocket (having fewer teeth) will effectively gear up the motorcycle, allowing for higher top speeds.
A larger front sprocket or a smaller rear sprocket will typically result in the chain becoming too loose. Therefore, it may be necessary to replace the chain with a longer one to accommodate the new sprocket sizes.
Keep in mind that modifying the sprockets and chain to increase top speed may have trade-offs. The changes can negatively affect the motorcycle's acceleration and low-end torque. Additionally, altering the gear ratios can impact the overall rideability and may necessitate adjusting the shift points while riding.
It is recommended to consult with a reputable motorcycle mechanic or performance specialist who can provide guidance on the specific modifications suitable for your Harley Davidson model and riding preferences. They can help you choose the appropriate sprocket sizes, ensure proper chain fitment, and address any other necessary adjustments for optimal performance and reliability.