Not Reaching Top Speed

EasybeeEasybee Member Posts: 16
I owe a 2005 342 Riker Feasta-Vee with 2 Mercury 350 engines. I have changed fuel filters, spark plus in both engines and both trim taps. I'm getting 10 knots at full throttle. What are some causes that preventing the boat from getting maximum speed of 50 miles. Need help.   

Comments

  • YYZRCYYZRC Georgian BayMember Posts: 3,680 ✭✭✭✭✭
    Did you change the cap and rotor?
    2008 350 EC on Georgian Bay
  • kordokordo Member Posts: 192 ✭✭
    Is the bottom clean, in what condition are the props?
  • Aqua_AuraAqua_Aura Lower Columbia River, WashingtonMember Posts: 2,277 ✭✭✭✭
    What RPM were you able to attain at full throttle? 
    2007 280 EC Volvo 8.1 Gi-H
  • LaReaLaRea Alexandria VirginiaMember Posts: 6,848 ✭✭✭✭✭
    I see you had similar complaints last year around this time.  Did you ever sort out the problems last season?  A 342 with 350s should get at least 30 kts, maybe 33 at WOT if everything's right.  Has it ever run like that since you've owned it?

    You said you had the hull cleaned last year. If you've ruled out problems with fuel/spark/air, could a past owner have installed the wrong propellers?  
  • Black_DiamondBlack_Diamond Holland, MichiganMember Posts: 5,409 ✭✭✭✭✭
    10 kts at full throttle?   Yikes.  

    Caps and rotors
    clean the spark arrestors
    Have you changed the gas/water seperators?  They look like an oil filter.   The fuel filters should be in-line and mounted on the firewall. 

    As noted above: a hull with growth will really drag bad. 

    Past owner of a 2003 342FV
    PC BYC, Holland, MI
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