What does a 350cc engine for royal enfield cost?

As of my last update in September 2021, there is no official 350cc engine available for Royal Enfield motorcycles from the company itself. Royal Enfield's currentラインナップ consists of models with engine capacities ranging from 346cc to 650cc.

However, it's possible that there could be aftermarket or custom engine options available from third-party suppliers or specialized workshops focused on modifying Royal Enfield motorcycles. The cost of such engines and their installation can vary widely depending on the specific modification or customization involved. I recommend directly contacting aftermarket parts suppliers or カスタム workshops specializing in Royal Enfield modifications for up-to-date information on 350cc engine availability and pricing.