Hi Ruth and Arnold<br><br>Last year I purchased a SM#6 wich I have since sold to Bob. During the sea trial the engine would not rev above 2100 rpms. The problem was diagnosed as faulty injectors. They were changed and the engine has been fine since then. However, there could be other less expensive causes this is what worked for me.<br><br>Thanks<br><br>Vito Ciaravino