Can these motors idle down enough for trolling? Its a 2004 Carb. Also, a dealer said a 4 cyl Yahmaha F50 would troll down slower than a 3 cyl F40. Something about 4 cyl. being able to idle down better than 3 cyl. Any thoughts.<br /><br />The F50 will be on a Alumacraft Lunker 16 LTD (660lb).