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Old 09-06-2011, 08:38 PM
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Default Mercury racing 300 Pro XS

Taking delivery of a 2008 Concept 36 with twin Merc 300 Pro XS with under 200 hours Experience with these motors will be much appreciated. Octane booster required? No warranty left. Want to make sure I get long term reliability,any suggestions based on real life experience? Thanks!!
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Old 09-06-2011, 09:27 PM
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wrong place for that - Scream and Fly is
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Old 09-07-2011, 04:26 AM
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Solid motors, but make sure you change all the filters....even the ones under the cowling.....use ring free and 93 0ctane......great motors IMO
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Old 09-07-2011, 06:33 AM
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I would private message PROPBENDER he has had a lot of experience with the XS line
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Old 09-07-2011, 06:43 AM
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I ran a 250 XS for 3 yrs w/out even a hiccup. Have several close friends running 300XS' on Stroker bass boats, tunnel hulls, etc. No breakages from any of them & they run them pretty hard. Way different boats though - not sure that would matter.
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Old 09-07-2011, 07:35 AM
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I have twin 300xs's on my boat and they are great motors. The motors that usually break are abused ones. Something to look out for are the coils. That's the only issue I have had for 350hrs and 3 years of use. Just do the regular maintenance and they are probably the best motor out there. I run 93 Octane everytime I fill up.
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Old 09-07-2011, 10:28 AM
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Merc will update the coils for free if they are the older ones that had some issues.
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Old 09-07-2011, 10:38 AM
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Bretter, Mercury racing replaced all of mine for free when one went bad. I was out of warranty by a year.
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Old 09-07-2011, 11:20 AM
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Isn't there a trick for filling the lu to improve the gears life?
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Old 09-07-2011, 11:58 AM
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Some say after the LU is completely filled with high perfomance gear lube, they let a little out for some expansion room. Once the LU oil heats up its suppose to expand. This will probably be most helpful if you run WOT alot. I have never had an overheat problem with my motors and I don't practice this method.
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Old 09-07-2011, 12:55 PM
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a buddy had a pair.....roughly 600 hours over the 5 years he owned them, 3 lower units on each motor...and they were never abused...and he changed the lu oil every 3rd trip. last time one went we never got above 4500 rpms...good luck with them...his were the 300's too
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Old 09-07-2011, 01:17 PM
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DirtBusters, which lower units did he have becuase there are a few different ones for this motor. Also what year were the motors?
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Old 09-07-2011, 02:28 PM
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Hi,

I know people having probs with the seals on their Sportmaster lower units. The Torquemaster og Fleetmaster should be fine. The Torquemaster has the same internals as the Sportmaster, but without the low water pickup and nose cone. It has a torque tab built in the skeg. The Torquemaster internals are stronger than the internals in the Fleetmaster.

Cheeers, Toffen
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Old 09-07-2011, 04:08 PM
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one was an 06 the other was 07, both boguth brand new at the same time and to my knowledge he ran both different lowers and had the same problem...
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