Technical Contact

Technical Contact

If you have a question that’s not answered in our FAQs or you need additional information, please contact us at the phone numbers listed below.

Mercury Racing Technical Services Hours
Monday through Friday
7:30 a.m. – 4:30 p.m.
(Central Time)

Outboard & Sterndrive Consumer Affairs
(920) 924-2088
(Calls may be recorded for quality purposes)

Mercury Racing Product Technical Publications
Service manuals, parts manuals; operation, maintenance, and warranty manuals.
(920) 929-5110
FAX: 920-929-4894


74 thoughts on “Technical Contact”

  1. I am trying to find installation manual to reinstall my Mercury 280s K Planes. I had to remove them to repaint my transom while restoring all my hardware on the transom. I am looking for the right way to apply sealant, which sealant to use, and how tight to torque the through bolts. Any help is appreciated.

    1. Hi Chris:
      I found an installation sheet; part number 90-843570 Rev. E 214.

      Instructions as follows: Apply polyurethane/silicone adhesive sealant such as Boatlife Lifeseal or a quality marinesealer suitable for underwater use. Liberally apply around each fastener, indicator wires, and between transom and upper trim plate.


  2. Hello, Is the class 1 race engine listed turbocharged or naturally aspirated? Are there any Qc4v naturally aspirated available for consumer purchase? Is it possible to order these engines with higher compression ratios? Thanks,


  3. We are designing a new supercar with leading performances especially regarding top speed and acceleration. We have seen on your racing website the QC4V motor in automotive version. We are interested in the possible application of your engine in our car. This is because it would be a perfect fit due to the very high power output offered by your power train. At this time, considering the large dimensions of your engine, we would need the technical drawings (or better a cad model) of the engine assembly because the chassis of the car needs to be designed around the motor.
    Best regards

    Achille Corbellati

    Dr. Diego Corbellati

    1. Hello Archille,
      I will share your request and contact information with our Automotive Business Development Manager Kevin Hellman. Kevin will be in touch with you soon.

      1. Hello Rick,
        I’m still waiting to be contacted by Kevin.
        Can you send me his contact so i can speak with him?

  4. Good morning:

    I hope and I wish that you can help me, please.

    I have two engines left and right mercury promax 300x mercury with15 inches midsection and in the Canary Islands (Spain) are not going well, I want to convert my two engines of 15 inches pass to 20 inches and in Europe do not get the required accessories.

    Please will can help me and said the total price of all the parts that I needed to make the change now of midsection 15-inch engines for to have next 20-inch midsection.

    Sorry for not comment the serial number because it is very old engine, you know already, but I have only one original serial number in paper in the boat document OT 819009 HPP193084BCH ME 300 PROMAX LSM but not know the other serial number but it was buying in the same date that the old owner did said to me.

    Thank you so much and I am waiting your news as soon as possible you can. I am sorry for my bad English written.

    Kind regards

    1. Hello Fernando:
      Your best bet is to see your local distributor to get a quote on the various parts you would need to convert the engines back to the 20″ models.

  5. Hi, I am looking at building a new motor here in New Zealand and have been reading about your new LS3 based quad cam cylinder heads. I was wondering if you could contact me with more information like flow curves, port sizes or any other information that you are willing to give? They look to be very impressive and would love to see if they will work with my application. Thanks.

    1. Mitch,
      We are continuing our work on the complete SB4 (Small Block Four Valve) crate engine. It is being prepped for release this Fall. We will post additional information as soon as it is available.

  6. Good afternoon, I am looking to make contact with the person that handles your shipping/transportation. I would like to set up an appointment with that individual for a possible meeting the next time I am in the area. We provide expedited transportation as well as cartage & truckload services.
    Would someone be able to help me with that?
    Kind regards, Duane Clausen

    1. Hi Zack:
      Yes, you can order them through Mercury Publications. P/N 90-840514R01, Call 920-929-5000 and ask for publications.

  7. Hi, I have a 2016 Triton 216 with a 300 Mercury Pro Verado and a 9.9 mercury kicker. I am looking at buying a Bravo 1 LT but not sure of what pitch to go with. I currently run a 3 blade Tempest with a 22 pitch. I can get 56 mph at 6150 rpms. I can reach 6300 rpms but the prop starts to slip shortly after 6150. I know several other fisherman with the same set up as me that currently run the Bravo 1 FS in 22 and 23 pitch and they are getting 60 to 63 mph. What pitch should I go with on the Bravo 1 LT? I am kind of leaning towards the 23 but not sure. Thanks

    1. Brad,
      To equal the same rpm at WOT as the Tempest – move up 1″ of pitch with the Bravo I LT or FS. I’m not certain the LT is the way to go for the Triton set up. I tested the Triton 206 with a kicker and the Bravo I FS outperformed the Bravo I LT. With the 206, the LT picked up the stern too much – flattening the ride along with scrubbing top speed by 1.5 mph. But that doesn’t mean it’s going to be the same for the 216. Let us know what you end up getting and give us an update on your performance.

  8. Hi Scott / Mercury Racing,

    Am I able to get the contact email address of someone who might be able to provide me with some technical data? I am outside of America and in quite a different timezone so calling would be nearly impossible.


  9. Scott,

    If I’m running a 621VS with 300 etec , with a stock stainless 15×21 3 blade and I’m getting 5450RPM, full load, and my boat is at the top hole mount already. The Etec 300 is 5400-6000RPM. How much more RPM do you think going to a 21″ LT would give me ? I’m thinking I want to get up around 5800, your thoughts ?

    1. Bob,
      The 21″ pitch could get the engine to 5600 rpm. The 20″ could add another 150 rpm for 5750 rpm. The 19.5″ could get you to 5825 rpm. But I think the 21″ pitch will give the best top speed by 2 mph.

  10. I’m running a 1992 Ranger Fisherman with a 2012 Mercury Optimax. Full tank of gas, passengers, I’m around 3000 pounds. Now, I don’t always have company, I often fish solo or with one other person a bunch. I tried a 23pitch Trophy Plus but it barely did 5200-5300rpm…. 5200 more consistently. Looking for the right prop for this boat…for both rough and flat water. Appreciate your input, thanks!

  11. Mercury Racing
    i was wondering about the SB4 7.0. Im doing an swap into a Ford Raptor and was looking for something Naturally Aspirated. Is the fuel system big enough to handle E85? that would be my biggest question. What size are the injectors?

    1. Hi Mark. The SB4 is restricted to applications in 1968 or prior model year vehicles due to emissions regulations.

  12. I have a 540 with a bravo 1 XR drive and have kind of a weird situation going on with the engine. I have 17 hours on it and since it was brand new when I go from sitting to getting on plane it has a stumble around 800rpm when at half throttle a misfire. As soon as I back out of it and get back into it it is fine. I have also noticed that it has has popped a couple of time when towing skiers and it sounds like a back fire in the intake. I have talked with the boat manufacturer and they are telling me that it maybe loading up when idling but it always to appears to happen trying to get on plane. I have a friend that has the same engine and drive configuration in a 29ft boat and he is having the same issue. Have you ran across this complaint in the past, and if so is there a computer flash or a fix you can recommend. Appears to me that it way be running rich.


      1. Yes I have. They said they they are having a similar issue with two other 540’s. One is the exact same issue as me and another is getting the same issues around 4000-4500. I believe they are working with someone from Mercury now to try to figure it out. Sounds like it may be a calibration issue.

  13. Hello Scott,

    I just bought a Ranger Angler 1880MS. It has the 200hp Verado (1201V23ED) with a Tempest Plus 19 pitch (48-825860) prop. I feel there is too much bow lift when just putting around the lake. Also with more than two people on the boat, it takes a bit to get on plane. When cruising at WOT, I’m right in the 5900 rpm range, it looks like another 200rpm shouldn’t be a problem.

    I want to reduce the bow lift and increase the hole shot, while not giving up much if any top speed.

    I was thinking about the Bravo 1 FS would be my best choice.

    Which prop would you suggest?

    1. Dennis,
      Consider the 19.5″ pitch Bravo I LT instead of the FS. The LT longer barrel will offer good planing, keeping the boat level while cruising, along with increasing engine rpm.

  14. I have a 224 Blackjack with a 250 sho. It came from the factory with a Saltwater Series II 21 pitch. I can turn it 5700 and get 59 mph. I was wondering if one of the bravo series props could potentially give me better performance

    1. Nick,
      A 22-inch pitch 4-blade Bravo I FS would be the prop for you boat. It provides exceptional planing and it remains on plane at slower speeds. It also stays hooked up through the turns. You could experience an additional 1.5 mph in top speed. Most Bravo I FS owners say the boat rides better as the prop lifts the entire hull, not just the blow.

  15. I have a Key west 210 BR with a Yamaha F200 and a 17 pitch reliance. Right now I can turn it 6100 and get 50mph. Would I see any performance increase with a Bravo prop, if so which one should I start with.

    1. Chad,
      I think the Bravo I FS might be too much prop for your set-up. The lowest pitch Bravo I LT is a 19” which may reduce engine rpm to 5600 to 5700.

  16. hi scott. i wonder if you can assist with selecting a propeller. mercury south africa seems not to have any answer and its more a thing of try this try that. i have a semi rigid inflatable 6 meter long and boat with accessories,fuel and persons weighs in at about 1100kg.on the said boat i have a late 2016 mercury 150hp 4 stroke. full throttle at high altitude of 6000ft i get rpm of 5300 and speed of approximately 83km/h. i want to if possible top end at 87km/h plus. at the moment im running a 21 pitch stainless tempest plus propeller. mercury suggest i go for a 19 pitch. i dont agree as will increase rpm but lower speed. what about a 23 pitch or perhaps a bravo propeller 21 pitch. i really hope someone can assist.

    1. KM,
      Here’s what you can expect going up in pitch the engine rpm will drop to 5000 rpm which is the bottom of Mercury’s recommended range. You could expect to pick up 2 km; the planing will be slower so maybe not a good idea. Stepping down to the 19” pitch the engine rpm will pick up 300 rpm but the speed will slow to 79 km. In your case, I think you’re already there with the 21” pitch, so don’t change a thing. Have fun.

  17. Scott,
    I have a 37 cabin midnight expres with triple verados 350, i just changed from 300 to 350 , but kept same props Bravo1 (48-831909 22 P), I dont see much improve in speed, What prop should I use? Any recomendations?

    1. Jorge,
      What was the wide-open rpm and speed with the 300 and what is with the 350? What style of gearcases were on the 300? Are the 350 engines mounted in the same height as the 300?

  18. Hello- I have a 2018 Ranger 620 w/ a 250 pro Verado and a 15 EFI kicker. Currently I have a 22 pitch Bravo FS. I am having problems getting out of the hole with the livewell full and 3 people (like a 1/4 mile). I have tried plugs in and plugs out. WOT I am getting about 5900 RPM and roughly 58MPH best case. Looking what I should try for a prop that gets me better hole shot and speed. Any help you could provide would be appreciated!

    1. Paul,
      For a much better hole shot and to get the engine rpm into the power at 6200 it’s the 20-inch Pitch Bravo I FS.

    1. Hi Jeff:

      Both are great engines – based off of Mercury’s all-new 4.6L V-8 four-stroke engine platform. It all depends on your application and what you want to do with it.
      The main differences between the 300R and 300 ProXS include the powerhead, midsection and gearcase options.

      The 300R has an exclusive fuel calibration which enables it to spin up an additional 200 rpm (5800-6400) vs the ProXS. an integral oil cooler keeps things cool at the higher revs. The 300R also has a custom intake cam lobe profile and shorter intake runners for a power boost.

      The 300R is available with both tri-ram and heavy duty midsections and Torque Master, Sport Master and 5.44″ gearcase options.

  19. I have a 400r and it is surging at different throttle settings, 30, 40, 50 mph and wide open. At wide open it’s really bad and if I pull back on throttle a little it will run good but start surging again. The local mercury dealer which has never worked on a 400r says it’s the rev limiter taking over. Its a 2017 and just started this and if it was the rev limiter why would it kick in at different speeds. The 400r use to turn right at 7000rpms wide open and now only about 6700 rpms wide open, with the same prop. Thanks in advance.

    1. Bill;
      It sounds to me that it may be a fuel issue. It wouldn’t be the rev limiter, that kicks in at 7100 rpm. Have your dealer check the fuel system.

  20. Hi, I am currently on a ship. I can’t call the number is there an email address that I can use to ask a question. We have 4 Mercury DSI outboards and they are producing aweful emmissions that it is a health risk. I want to know if we are usig the wrong fuel. Please respond to my email address URGENT. Thanks

  21. Hi I just purchased a Phoenix 920 pro with the mercury 250 pro xs 4 stroke. I have read some pretty good things about the Bravo props what would you recommend for that set up and would it. E better than the 3 blade fury that’s on it?

    1. Scott,

      Congrats on your purchase. Consider the Bravo I FS, it will offer great handling and top speed for your setup. The Bravo XS and FS are the same propeller, the XS just has more vent holes for planing performance in two stroke applications. If you have a jackplate, running a four blade propeller will also help you stay hooked up at higher engine heights. It will be hard to recommend a pitch without test data from your setup, but expect to be around a 26 pitch.


  22. Hi Scott: I have a 2019 Ranger 619FS on order, and it will be powered by a Mercury Pro XS 225 hp 4-stroke outboard, with a 9.9 hp Pro Kicker also on the stern. Considering the all-new Pro XS, which Merc prop do you think would provide the best overall performance (speed, hole shot, ride, fuel economy). Thank you.

    1. Steve,

      The stock prop for these boats is usually a 19 pitch Tempest. Consider the 20 pitch Bravo I FS for increased performance. The major gains occur by being able to raise the engine up one hole from factory spec by switching to a four blade propeller from the three blade Tempest. The FS carries the boat very well and has great planing performance. Have fun with your new rig.


      1. Thanks, Nick. I ran a 20-pitch Bravo 1 LT on my 2018 Ranger 619FS with a 225 hp Verado per Scott’s recommendation, and loved it. The only reason I asked for advice again was the change to the four-stroke Pro XS. I appreciate your time!

  23. Hi,

    i want to build a custom Axopar 37, i want the fastest parts out there, Im guessing double 400R, with 5 blade CNC Cleavers?? What would you suggest? Thanks for the reply

    1. Adam,

      Give Axopar a call, they seem to have their boats dialed in. I believe they run Rev 4s, and have setup multiple boats with 400R power.


  24. I have 2008 formula 353 w twin 525’s. I’m have trouble with 1 of the motors and have gone through exhaustive measures to diagnose the problem. The motor gets to operating temp and then dies. I’ve data logged the computer and did back up mechanical diagnosis with no success. All the mechanics that are familiar with this motor are stumped. I was wondering if there is an engineer at Mercury I could talk to?
    Thanks for any help.

    1. Hi Jim. I spoke to our service manager Bob Krupp who said he has spoken to you. As Bob had mentioned – you should take it your dealer and check the engine harness. I hope this helps.


  25. Scott I have recently purchased a 2011 Cig Top Gun staggered 700s with NXTs. The majority where built with 1.5 gears and run 17.25 X 34 and 35s

    This one was built with 1.6 gears and has 17.25 x 37 props. Will this set up be harder on the NXT drive transmission ?

    Do you happen to know what the standard X dimension is for this model should be .Cig won’t return calls and I don’t want it to be higher than norm.

    1. Richard,

      Stepping up in pitch will have a small impact on the drives, but there are other factors that will impact them much more such as how you drive the boat. Aggressive throttle use and jumping waves will put a much larger strain on the drives. I am unsure on the drive heights, you can try calling Teague Custom Marine or Performance Boat Center, they both rig a lot of cigs.


  26. I’m running a 2019 Ranger 620 powered with the new Pro XS 250 4-stroke and stock prop. What are my prop options for increasing top speed without raising the motor and best prop if I decide to raise the motor one hole? Thanks!

    1. Chad,

      What is the stock prop? It could be a Tempest or a Bravo. At the lower engine height, the Tempest will be a very good performing prop. The speed increases come from increased RPM at a higher engine height with a four blade prop that reduces slip, usually the Bravo I FS.


      1. Nick,

        The prop is a Tempest Plus 48-825862 21P. I would still like to get a little more top end though, any other options at stock height?

        Also, what are you recommending for a transom saver on the new Pro XS 250 4-stroke. It seems like there’s are a lot of aftermarket brands out there, most say they fit, but most won’t work unless you have the trim limiter adjusted. The mechanics I spoke recommend against that, any suggestions? Thanks!

        1. Chad,

          The 22 pitch Bravo I FS is the go-to replacement for the 21 Tempest. You really start to see the speed gains when you raise the motor up one hole on the transom while running the four blade.

          Transom savers that bolt directly to the trailer will be best, I’m not partial to any brands, they are all adjustable in length.


  27. Hello,
    I recently acquired a 2007 Simmons Custom Boat 22 foot Top Cat completely un-rigged at about 1500 lbs un-rigged according to Eric Simmons. I have a 99 Triton TR 20 With a 2012 Mercury 200 XS pro Low hrs and Atlas 8 inch offset JP and plan on installing it on the SCB, I will be running the Texas Flats in this rig. My goal is to get this rig up and out the hole quick and maintain as much top end as possible what would be the best prop size and pitch for my application

    1. Shaun,

      Do you have any idea of top end speed? Many Simmons are running the Pro Max or Bravo I XS. It might be worth giving Simmons a call, he is really in tune with what props work on his boats.


  28. Hey guys, running a 28’ BlueWave step hull with twin V8 merc 300’s. Currently running 23P Bravo 1 LT’s at 6000-6050 @ 67.5mph. Boat runs flat and carries a load well and out the hole strong…but just wanted to get a faster top end set of props for when I wanta “run”. Would rev 4 XP’s fit the bill and at what pitch? Any other suggestions?

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