Fred Head combustion chamber size guide for motorized bicycles

Hi folks. I wanted to make this video to help people select the head which will give optimal performance. Many factors affect which size combustion chamber is the best. The size of the intake and exhaust systems tend to be the main deciding factor. Although rider weight, gearing and type of driving/track will also have an influence on proper selection. Go to www.crmachine.com to purchase heads and other engine parts.