fairly new cond 08' 20hp Yammy lacking power and wont plane?

skycries57

Cadet
Joined
Sep 18, 2009
Messages
23
hi guys, bought a hardly used mint cond. 2008 20hp long elect start yamaha motor and took it out to the lake today for the first time. Its was just me,bro and 3 yr old son, around 430 lbs in boat, max capacity is 600lbes.

Everything ran perfect except it will not plane and seems to be lacking top end and power. My previous 03' 15hp yammy and 02' 20 honda ran circles around this newer motor. My 03' 15hp yammy would plane 3 200lb guys with no prob on my 14' 05' lund wc14, it would take a while but once there it ran like a champ.

So what do you guys think could be the problem? I ran new gas,line,connections, and motor is pristine inside and out. I using an older tank but new connections, should I check for clogs in fuel line IN tank and/or fuel filter in motor?

The prop looks like it has been either replaced and/or painted, you can seen dents all over the edges of the blades..

Thanks again!
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,116
Re: fairly new cond 08' 20hp Yammy lacking power and wont plane?

need to see what RPMs the motor is running at WOT, saying it will not plane boat means nothing
 
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