ESP can build you any Zenoah RC based special size gas engine you need.  If you do not see what you need on the DDM web site, contact Brad at DDM and put in your special order.  Their toll free number is 1-866-368-1441. My number is (616) 458-8103 (Eastern Standard Time Zone).

Below are the new PUM top end kits from ESP, also sold through DDM.  You can expect the same top quality, attention to detail, and winning performance that my racers enjoy, right off the DDM shelf.  If your not winning boat races, give ESP a try.

                                                                             PUM piston port Big Bore Top End Kit

The big top end kits from ESP are currently making big waves. This kit makes a 28.5cc & 29.5cc engine if using a stock or 1mm stroke crank. Approximate horsepower with a good pipe 6hp and a very wide RPM range of power from lower RPMs to a screaming top RPM, 18,000 RPM minimum typical. The cylinder starts out as a air cooled ZENOAH G290 top end kit. The fins are CNC milled to fit the stock ZENOAH water jacket. The porting is done by CNC and finished by hand. The piston is relieved near the crown area to reduce any chance of piston scuffing due to cold water.

The big reed case top end kits from ESP are currently making big waves. This kit makes a 28.5cc & 29.5cc engine if using a stock or 1mm stroke crank. Approximate horsepower with a good pipe 7hp and a very wide RPM range of power from lower RPMs to a screaming top RPM, 18,000 RPM minimum typical. The cylinder starts out as a air cooled ZENOAH G290 top end kit. The fins are CNC milled to fit the stock ZENOAH water jacket. The porting is done by CNC and finished by hand. The piston is relieved near the crown area to reduce any chance of piston scuffing due to cold water.