04yamaha200hp

ceravino

Recruit
Joined
Jul 5, 2009
Messages
4
hi my04 two stroke 200hp runs good at idle and up to about 7 mph but if i give it gas sometimes it drops rpms like it is starving for gas has only 165hours any ideas? thanks
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: 04yamaha200hp

hhmmmmm
how many models of the 200 were made in 04, HPDI,OX66,4 stroke efi and carbs come to mind,
all use vastly different fuel and ign controls.
can we get a model number ?
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: 04yamaha200hp

sx200c isnt a US market model designation.
a picture would help now of the powerhead with the hood off.
sx indicates it is an OX66 motor. EFI 2 stroke.
how long did it sit between the time it ran good and now ?
 

ceravino

Recruit
Joined
Jul 5, 2009
Messages
4
Re: 04yamaha200hp

it was running good one day earlier. i changed the primer bulb now it only drops rpm if i floor it if i raise throttle slow it goes fine
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: 04yamaha200hp

sounds like a fuel restriction ,bad lift pumps or a clogged vapor seperator filter.
quit running it until its fixed or you may get to post about tossed rods and scuffed pistons .
 
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