How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dominick Your Own Question
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
Type Your Boat Question Here...
Dominick is online now
A new question is answered every 9 seconds

I have a 300 hp It idles ok and when I try speeading up it

Customer Question

I have a 300 hp It idles ok and when I try speeading up it just bogs down
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.
Customer: when I try speeding up it simply cuts out like it is only on a few cellinders
JA: Is there anything else the Marine Mechanic should be aware of?
Customer: I checked the gas, ok I looked at all the plugs some carbon, cleaned them
Submitted: 13 days ago.
Category: Boat
Expert:  Jason replied 13 days ago.

Hello my name is ***** ***** am I speaking with?

I Do not see any kind of model information from you. What is a 300hp? Are you working on an inboard our outboard? What is the brand/model or serial number of what you are working on?

Customer: replied 13 days ago.
call me
Expert:  Jason replied 13 days ago.

I don't even know what you are working on. I may or may not be the right person to speak with. What are you working on?

Expert:  Jason replied 13 days ago.

Are you still here?

Customer: replied 13 days ago.
Customer: replied 13 days ago.
I have a outboard direct injections
Customer: replied 13 days ago.
ok can you answer on line?
Expert:  Jason replied 13 days ago.

I still dont' know what you have. Who makes this engine? What is the model or serial number on it?

Customer: replied 13 days ago.
It is a 300 hp Yamaha direct injection, 2004 model
Expert:  Jason replied 13 days ago.

Yamaha, got it. Now what is the history on this engine? Does it sit for long periods of time? When was the last time it ran correctly? Has anything happened to it that I should know about?

Customer: replied 13 days ago.
I run it about once a week, last time I ran it it did same but after a while it would speed up ok
Customer: replied 13 days ago.
I checked for water in fuel,none I checked plugs, little carbon, cleaned ok.
Customer: replied 13 days ago.
are you still there
Expert:  Jason replied 13 days ago.

Sorry for the wait, I had to check my turkey. Yamaha HPDI engines are fairly complicated and a scan tool is required to actually do any kind of troubleshooting on it. What kinds of questions did you have for me? Have you checked engine compression, spark output, or run it on another fuel source yet?

Customer: replied 13 days ago.
looks like you can't help if you saying I need a mechanic
Customer: replied 9 days ago.
Cancel all , no need for your services

Related Boat Questions