2004 115 txr 4 stroke

[besontodd]

I am having problems applying power and maintaining power, idle is great, cold starting great, but once on the water there is power hesitaiton and sputtering. I have a friend with a similar motor, with similar problem, he had the VST and high pressure pump screen cleaned to fix a similar problem and I can't find any of these on my engine. Is there a VST on a 2004 115 TXR 4 stroke, Any help would greatly be appreciated.

[boats.net]

If its a four stroke then yes it's fuel injected. What is the model number?

[besontodd]

F115TXRC - I have the parts listing, but do not see a Vapor Seperator tank, All I can see on the parts listing is a low pressure fuel pump, Were is the highpressure pump and VST on this motor?

[boats.net]

It's behind the intake manifold,
2004 F115TLRC Yamaha Outboard FUEL INJECTION PUMP Diagram and Parts

[besontodd]

how do you get at the VST?

Is there a trick to getting at the highpressure fuel pump and VST? Do you have to remove the intake manifold?

[boats.net]

You will have to remove intake.

[besontodd]

I have the VST and pump assemble off, any suggestions on fluids to clean, TANK, Screen and pump?

[rodbolt17]

yamaha combustion chamber cleaner works about the best I have tried.