Hello Tracy,I am interested in your 48cc engine... as well as if you make other larger engines,,, like 75cc, 100cc &150cc ?Are they 2 stroke or 4 stroke engines ?How reliable are the engines in 100&＃39;s or 1000&＃39;s of hours ?What are the prices of your various engines wholesale to me as a distributer/manufacturer ?Can the muffler be designed to exhaust foreward or backward ? I am especially looking for light weight, high horsepower ratio with a high torque 4 stroke gasoline or diesel engine to put in various production aircraft. I will be using 4 stroke engines from 4, 8, 10, 14, 16 & maybe up to 20 horsepower.The engines will be installed in my product and sold globally so I do need quality at a good wholesale price.NOTE: The best way to contact me is by email. Thank you Tracy.regards,kevin cooper