what are the factors that govern the max speed of a engine will changing the air filter or carb to a high performance one will helpHow do you increase the maximum speed of a single cylinder sohc gearless engine?You will make some marginal gains by doing this.
To make more significant gains, you will need to port and polish the cylinder head. Install a high performance camshaft. Increase the compression ratio and use a higher octane fuel. Add a big bore kit with a larger piston. Enlarge the intake manifold and use a larger carburetor. Add a high performance exhaust header and muffler.
Unless there is a specific reason to keep this small engine such as racing sanctioning body rules, it is usually much more cost effective to sell the small engine and buy something with a larger more powerful engine. Small engines can be very expensive to modify to get only marginal horse power gains.How do you increase the maximum speed of a single cylinder sohc gearless engine?Same as you would do to any other 4-stroke engine. Although balancing all the moving parts is a good starting point with a single cylinder motor. From there you can flow the head, cut the cam ect.
