Obtaining maximum speed

Easybee

2005 Rinker 342 Fiesta Vee,  what are some causes for not reaching maximum speed when the throttles are fully engaged? Has the engines serviced, had barnacles removed, the hull cleaned and painted, outdrives are in good condition. Any suggestion are appreciated.

YYZRC

What’s your max RPM?

If you are looking for more speed, most everyone on here will recommend the Hill Marine props, myself included. They give great stern lift. 

aero3113

Bad fuel, incorrect prop pitch, worst case worn engine. Depending if the engines were fully serviced (plugs,wires,distributor cap/rotor,filters,flame arrestors cleaned, timing checked)

aero3113

Also, not trimming the drives and tabs correctly or something wrapped around the props.

Handymans342

Or dirty bottom

aero3113

Handymans342 said:

Or dirty bottom

He already cleaned the bottom.

LaRea

At wide-open throttle, both engines should reach the same RPM.  If not, look for issues with the engine that has lower RPM.  Chafed spark plug wires, etc.

Willhound

And by maximum speed do you mean engine RPM or speed over water? I think the important question is are you getting max RPM's out of both engines.