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  1. #16
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    I have had Sierra parts come in Mercury bags with Mercury instructions.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

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  3. #17
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    Jun 2006
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    Silverton section of Toms River, NJ/Stuart, Florida
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    They rebag them at the border

  4. #18
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    i run sierra water pump impellers and merc impellers they look the same and work just fine

  5. #19
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    Quote Originally Posted by vnemous View Post
    They rebag them at the border
    Must be the Russians.

    Myself nothing but Merc stuff, but do a ton of Sierra because we give the customer the choice. Have to to compete with the other guys. Last few years for a everyday non High Perf the Sierra has been good.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

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  7. #20
    Join Date
    Oct 2010
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    Harrisburg,Pa
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    Quote Originally Posted by 1BadAction View Post
    All that headache to save 11 bucks. You sure told us.
    Since when is making money a headache. Used wore out powerhead,vs new powerhead for customer! It's a win win for everybody. Now if you are a backyard mechanic, spend the 11$

  8. #21
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    Gothenburg, Sweden
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    Quote Originally Posted by Scream And Fly View Post
    This is my feeling exactly. Unless I had no choice, I would always choose the Merc OEM units.

    Greg
    As long as the boat stays in the garage, it doesn't really matter...
    Markus' Performance Boating Links:
    www.toastedmarshmallow.com/performance

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  10. #22
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    They usually send the start up batch and the last run to the european countries.
    If I don't ask any questions, I'll never learn anything.

  11. #23
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    I get a kick out of all you guys that have 1,2, or 3 boats and bad mouth a good parts supplier. We have hundreds of customers that have Sierra water pumps in their boats, never an issue. As long as you don't turn higher than 6-6500rpm they are fine, never had an issue. In a real high performance app yes use factory Merc. I only use the Merc stuff in my high performance stuff. But in a stock application the Sierra stuff is fine.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

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  13. #24
    Join Date
    May 2014
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    NH
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    Quote Originally Posted by Mikeytogo View Post
    I just put one on my 2001 Optimax. The Water Pump kit parts looked exactly like the Mercury parts that came out. Think I paid $48. Mercury wanted $113. Water tested perfect!
    I'm all for aftermarket parts in certain things but a water pump in a 2.5 liter Opti is a real bad place for it. The issue w/ the whole cooling assembly in those, at least in my '06 models, is it's very closely tuned. They need a certain pressure out of the pump that works right with the poppet valve to keep the water flowing in the right areas at the right RPM. If you have anything out of wack with that impeller certain areas of the block and/or the air compressor just do not cool right. It's a high pressure low flow pump, all about a tight seal on the housing - I only get 1 season out of an impeller before I risk overtemp alarms, and that's in cold ocean water off the NH/MA coast.

    Those Opti 2.5's are so sensitive - I bought a used lower unit once from a dealer. It had a new water pump just installed. Some dip**** long the way must've rotated the driveshaft the opposite direction, which I noticed by the way I felt the impeller flip over when I first checked out the lower unit. Not another thing was out of place but it barely pumped water from sitting there backwards just for a month or so.

    After 10 years of owning these engines the only way I buy water pumps now is I go to the local dealer and pay retail (yep $48 is right) for a pair of kits, and I do so every spring (no sense having them take a set there over the winter). I've even twice had issues w/ Mercury kits I bought on Ebay - they were Mercury kits but likely sat on a shelf too long. Is just not worth the headache w/ an Opti.

    Now if we were talking a 19XX [insert standard non ultra high performance carb 2-stroke here] sure absolutely probably will work, and you probably only need to replace it every 3 or 4 years, but I still tend to go for the factory stuff if it's available.

    On that note, I actually know a guy who (is an utter moron yes) blew a powerhead on a black max last year because the sierra pump spun on the bushing, AND SIERRA PAID HIM $4600 FOR IT!!!! So I guess it's a good company that stands behind their products at least.

    Jon
    Last edited by leaky; 05-25-2017 at 10:45 PM.

  14. #25
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    Leaky I hear what you are saying but we bought an oem and a sierra and they where the same numbers mold marks etc. I just put on sierra coils and unlike the oem superceeded they were the only ones with the same wiring seem to be fine. If I could see a difference yes oem. I think on older stuff sierra might be suppling oem. .02

  15. #26
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    use pro marine no problem
    2008 Mirage V-Racer 1983 2.0L Mercury 15"
    2010 Mirage V-Racer 1987 2.4 Original SST140 Powerhead
    1974 Hydrostream Viper
    1977 Hydrostream Viking

    1995 Mirage River Racer " Boat On Loan" Thanks Mike Mullins 2.5 245hp 15"

  16. #27
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    Yes you can use a Sierra water pump on your 150hp with no problems. Don't worry about it.
    If I don't ask any questions, I'll never learn anything.

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