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#10816782 - 05/04/15 08:54 AM Replaced Power Head
Der Vorsteher Offline
TFF Guru

Registered: 02/11/11
Posts: 23302
Loc: The 903
I am looking at a used boat that is a '99 200 Yamaha Vmax EFI. It has had a new power head installed with the phase 2 kit. Is this something that I should be leary of? I don't know much about the inner workings of the engines.
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#10817035 - 05/04/15 10:16 AM Re: Replaced Power Head [Re: Der Vorsteher]
HoustonCatfisher Offline
Outdoorsman

Registered: 01/31/14
Posts: 182
Loc: Houston, Texas
Phase 2 kit is a performance modification kit. It usually has higher compression head and other things to boost horsepower.
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#10817088 - 05/04/15 10:35 AM Re: Replaced Power Head [Re: Der Vorsteher]
ssmith Online   content
TFF Team Angler

Registered: 11/22/07
Posts: 3291
Loc: scotland tx
higher compression means more power until you get some less than quality fuel an then you are back to rebuild time.

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#10818530 - 05/04/15 07:25 PM Re: Replaced Power Head [Re: Der Vorsteher]
bigtexnick Offline
TFF Celebrity

Registered: 08/27/08
Posts: 8498
Loc: Texas
I would probably have it checked out by a mechanic just to double-check the repair job was done correctly and there are no latent issues.
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#10819006 - 05/04/15 10:30 PM Re: Replaced Power Head [Re: Der Vorsteher]
JoeFriday Offline
Pro Angler

Registered: 05/23/13
Posts: 895
Loc: Flower Mound, TX
The real question would be what made the first Powerhead pop. If that wasn't fixed, then it could happen again. The 0x66's are pretty tough. Is it a Hydrotech phase 2 kit? Who did the work? What other documentation is there for all the maintenance stuff? When was the last time the injectors were cleaned and calibrated?
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#10819662 - 05/05/15 10:00 AM Re: Replaced Power Head [Re: Der Vorsteher]
Bandit 200 XP Offline
TFF Celebrity

Registered: 03/03/11
Posts: 5466
Loc: Ray Roberts
OX66's are very good motors.Have a good Yamaha tech check it out.

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