The choice of the "best" carburetor for a Royal Enfield Bullet can depend on various factors such as the specific model of the Bullet, the desired performance characteristics, and personal preferences.
Mikuni VM28 or VM32: Mikuni carburetors, specifically the VM28 or VM32 models, are popular choices among Royal Enfield Bullet riders. They offer good performance and are known for their reliability. These carburetors are often used for their smooth throttle response and easy tuning capabilities.
Amal Concentric: The Amal Concentric carburetors, such as the Amal 930 or 932 series, have been used on Royal Enfield motorcycles for many years. These carburetors are known for their simplicity and compatibility with classic motorcycles like the Bullet. They can provide adequate performance for most riding situations.
Keihin PWK: The Keihin PWK carburetor is another option that some Royal Enfield Bullet riders prefer. It is a popular choice among performance-oriented riders who may have modified their engine or are seeking improved power delivery. The PWK series is known for its precise fuel metering and tunability.
It's important to note that carburetor selection should be based on careful consideration of your specific requirements and preferences. Factors such as the bike's engine modifications, riding conditions, and personal riding style can all influence the choice of the carburetor. Consulting with experienced Royal Enfield mechanics or enthusiasts who have expertise in modifying and tuning Royal Enfield Bullets can provide further insights and recommendations based on your specific needs.