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  #1  
Old 05-19-2013, 09:25 AM
croixdog croixdog is offline
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Default Gas or something else?

I bought a "new to me" 2004 Yamaha Vmax. It seems to have great power and ran well. I had a person tell me I had to add ring free and seafoam to make it run better and keep it clean. Well I think that may have kicked out some gunk, because running full speed I get surges.

The first time I took the boat out I hit 55 mph with a tale wind and very light load. But consistently its a 52 mph boat. Now I may get 43-44 or so then it will "kick in" with more power and jump up to 52 for 20 seconds or up to a minute, then bog down a little.

I have ran about three tanks of gas through this engine, and I thought maybe it was some bad gas I picked up as well.

My concern is there any type of electrical issue or cyclinder problem with this??

Thanks for your thoughts in advance.

Croixdog
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  #2  
Old 05-19-2013, 09:55 AM
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Jason G3 Jason G3 is offline
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Change the plugs? One fouling?
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Old 05-19-2013, 10:10 AM
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wiredog wiredog is offline
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Also install all new gas line from tank to motor!! Wiredog
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Old 05-19-2013, 11:03 AM
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yarcraft91 yarcraft91 is offline
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Quote:
Originally Posted by Jason G3 View Post
Change the plugs? One fouling?
Yep- 1st thing to do is pull and check the plugs. If in doubt, replace them. If one of the plugs is wet or oily compared to the others, notice which cylinder that plug was in.

If the problem remains, check the new plugs to see if the same cylinder that had a wet, oily plug has one again. If so, suspect the spark plug wire or ignition coil.

Last edited by yarcraft91; 05-19-2013 at 11:06 AM.
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Old 05-19-2013, 11:41 AM
REW REW is offline
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Croixdog,
A very good suspect is a piece of gunk that has fouled a plug that burns cleanly now and then.

Pull all of the plugs, install a new set of plugs and give it a run.

It is really a good idea to carry a full set of replacement plugs in water proof containers anyway for every motor.


I use the smaller rubber gasketed Plano boxes to store spark plugs. You want the plugs to remain in new condition during storage.
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Old 05-19-2013, 12:36 PM
Chis Chis is offline
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Croixdog,
Is the motor a HPDI or carbed VMAX.
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  #7  
Old 05-19-2013, 07:09 PM
croixdog croixdog is offline
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Default carbed

Its a carbed Vmax ox66 Yammie. Its a beast out of the hole, when its not gunked up!!

Croixdog
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Old 05-20-2013, 08:39 AM
ChuckD ChuckD is offline
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OX66 is an EFI motor.

I just had issues with my Mercury EFI and it was the fuel.

Has the fuel filter been replaced recently? I would replace the large fuel filter/water separator if you haven't. When you remove the filter, pour the gas into a glass jar to see if you have water...it will separate and you can see if water in the fuel may be an issue?

Trying to figure out my motor performance issues I learned of other fuel filters hidden throughout the motor. Looks like your Yamaha has a filter in the Vapor Seperator Tank (VST). There is a fine screen on the bottom of the fuel pump inside the VST tank that could be restricted? If you are mechanical do a internet search on your motor and see if you can find a online parts fiche to find this screen. Mine was pretty gunked up, but it wasn't my primary problem.

I would try some Yamaha additives (Ring Free) in the fuel and use it on a regular basis.
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Old 05-20-2013, 09:03 AM
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Jason G3 Jason G3 is offline
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I agree with Chuckd. Does your Vmax setup even have a Yamaha fuel/water seperator installed? If not, do it with all the ethonol issues out there. Also as said, use Yamalube Ring Free and Yamalube fuel conditioner and stabilizer plus in every tank of gas. I have the above setup, for both my Yamaha main and kicker and never even a burp out of them.
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  #10  
Old 05-20-2013, 09:09 AM
PJM PJM is offline
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Croixdog

Check your Oxygen sensor and make sure that is clean and make sure that your low pressure pumps and not bad.
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