My motor is overheating - 2006 Yamaha Vmax carb

[spiroh]

Hello about two weeks ago I was running the motor and my overheat alarm went off. So I waited about 20 min and I was able to run back to the launch going slowly. I thought it was due to having my motor trimmed up halfway. Fast forward to today and we ran the boat just fine for a few minutes. The second time we went on a run my alarm went off. At this point I used the trolling motor until we were getting ready to go home and took our time getting back to the launch. The water pressure when I gunned it was 25 and up so it seems to be fine. Does anyone have an idea what could be causing the alarm to go off? I am really concerned now.

 

[99yam40]

Re: My motor is overheating - 2006 Yamaha Vmax carb

When was the last time you checked/changed the thermostats, PRV, and water pump impeller. These are normal preventative maintenance items that Yamaha recommends on a regular basis

 

[spiroh]

Re: My motor is overheating - 2006 Yamaha Vmax carb

I just purchased the boat used from a private party 2 months ago. I do know for a fact the lower unit including the impeller and water pump were replaced prior to me purchasing the boat. I should have it checked by a mechanic but before doing so I would like to hear what an issue like this is caused by?

 

[99yam40]

Re: My motor is overheating - 2006 Yamaha Vmax carb

thermostat not opening properly, PRV sticking open (low RPM overheat), blockage in cooling passages

 

[spiroh]

Re: My motor is overheating - 2006 Yamaha Vmax carb

Are these problems expensive to fix?

 

[99yam40]

Re: My motor is overheating - 2006 Yamaha Vmax carb

depend if the bolts come out without breaking off

 

[spiroh]

Re: My motor is overheating - 2006 Yamaha Vmax carb

I guess I will soon find out how much it will cost. I have set up an appt with my local dealer to take a look at it.

 

[rodbolt]

Re: My motor is overheating - 2006 Yamaha Vmax carb

are you sure it was overheat? what did the visual indicates on the tach indicate?
Vmax tells me its on a bass boat.
does this boat have a jack plate, if so a water pressure gauge is a must.
if the remote oil tank filter is clogged you get the same symptoms and an oil indicate,typically 3 bars flashing.
if your not running factory yamaha gauges there is no good indicate.

 

[spiroh]

Re: My motor is overheating - 2006 Yamaha Vmax carb

The motor is on a skeeter zx190. It has a water pressure gauge, low oil and overheat indicators. My water pressure was a good 20+ psi (closer to 25psi)when running. The boat does have a jack plate. After a longer run the alarm overheat and indicator went off. When idling slowly I do not get any alarms.

 

[spiroh]

Re: My motor is overheating - 2006 Yamaha Vmax carb

I took it in and they told me I had a charred exhaust gasket, wrong spark plugs and they will also rebuild my water pump. I find it odd that the water pump needs to be rebuilt because I was getting very good water pressure. The total bill will be $400. Could these problems cause my overheating?

 

[rodbolt]

Re: My motor is overheating - 2006 Yamaha Vmax carb

whats the part number of that gasket?