Yamaha Outboard Studders when Accelerating

kql3103

Recruit
Joined
Mar 15, 2010
Messages
1
Hello,
My Yamaha VX200 66XL studders when I am taking off and when I reach high rpms. If I take off really easy its fine and when I'm cruising under 40rpms its fine. What is causing this?
Thanks,
Kris
 

99yam40

Fleet Admiral
Joined
Sep 7, 2008
Messages
9,116
Re: Yamaha Outboard Studders when Accelerating

motor is sick. fix it before it dies from possible lean running cylinders
 

cousinabe

Senior Chief Petty Officer
Joined
Nov 13, 2001
Messages
765
Re: Yamaha Outboard Studders when Accelerating

when was the last time the vst and lp fuel pumps were serviced?
what other maint history has been done.
what is the full model number off the port side bracket.
 

reelbill

Recruit
Joined
Apr 7, 2010
Messages
1
Re: Yamaha Outboard Studders when Accelerating

I experienced the same symptoms with my 70 Yamaha two years ago. I ignored it for a long time untill the engine abruptly shut down while I was running at full throttle across Lake Erie. I purchased a fuel pump kit for about $12 and installed it in about 1/2 hour. Motor has been running fine since.
 
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