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View Full Version : Do's and Don'ts on motor break-in????



Gary C
03-13-2002, 08:48 AM
Haven't picked up my new 22DCB/300x and was wondering what is the best way to breakin the 300x?
Thanks

HavasuDreamin'
03-13-2002, 08:57 AM
This is a question for mmtech. Hopefully he will post. I have owned several Merc's although none have been the 300x. I was always told to vary the rpm's up to about 3500 - 4000 for the first 3 hours. Then vary the rpms up to 4500 - 5000 for another 2 hours. Then vary the rpm up to 6000 for 2 more hours. Then take it all the way up but don't hold it there until you have 10 hours on the motor. Some may say this is overkill, but I am coming up on my 6th season on my 2.4 bridgeport with no problems. I consistantly run 7400-7500 rpm. Good Luck. http://free.***boat.net/ubb/cool.gif

mercjerc
03-13-2002, 01:02 PM
By the book...I have one and have 11 months on it. No problems. I have had two other HP Mercs.. 225PM, 280, no probs. Things will be much easier if there are any warranty claims. HD is right on the money.

snappertapper
03-13-2002, 01:07 PM
well there is two ways to break in a motor , by the book and wide open i always break mine in wide open but u might wanna do it by th ebook

Jrocket
03-13-2002, 02:59 PM
I'd go with HD's way on this.One really important thing especially now with the cold water temps is too let it warm up really good before putting some throttle to it.I've heard the 300's take a little longer before they actually let loose and run full at there full potential.My 2.5's broke in fairly easy.Just remember to let um warm up good.......JR

snappertapper
03-13-2002, 05:05 PM
yea i agree with jr anout letting it warm up even though im in florida nad dont have this problem but i think hd might be right about breaking it it even though i do mine wide open

HavasuBarney
03-17-2002, 06:26 PM
300X is a different animal.
Break-in is done at 4000 - 5500 rpms for the first 4 hours, need to run it hard.
Do not let it idle for more than about a minute during the first 2 hours.
After the first 4 hours, run it as close to the limiter as you can for the next 2, 7100 rpms.
May want to run a small wheel, with my 26p I was running no less than 70 to break it in.
NO double oil for break in either.
Topac to Parker Dam back and forth.
[This message has been edited by HavasuBarney (edited March 17, 2002).]

snappertapper
03-18-2002, 07:02 AM
i like his method of breakin this is a very good way to do it though

Gary C
03-18-2002, 08:28 AM
Ok, stupid me, what is Double Oil???? http://free.***boat.net/ubb/biggrin.gif
Thanks for all the other info.

HavasuBarney
03-18-2002, 09:38 AM
The 300X along with many new outboards come set up with oil injection.
Previous year models suggested adding 50:1 oil to your gas as well as running the oil injection for about the first 50 gallons of fuel.

snappertapper
03-18-2002, 12:03 PM
i would unhook the oil injection not reliable enouh for me

Gary C
03-18-2002, 03:45 PM
Ok, thanks.
Just never owned a hi-hp one before. Owned my fair share of jets and v-drives.
Was down there today and they got the motor hung.

snappertapper
03-18-2002, 04:38 PM
well thats good atleast you know they are working on it

Screaming Pete
03-19-2002, 12:17 PM
Originally posted by Gary C:
Haven't picked up my new 22DCB/300x and was wondering what is the best way to breakin the 300x?
Thanks
Also keep in mind that the computer keeps tract of the way you run it all the time. I forget just how much memory it has but its enough to tell if you been running wot with only 1 or 2 hours on it. Also when you come off the gas don't just come off all at once the reeds slap the reed block real hard and it will start eatting them
Screaming Pete

HavasuBarney
03-19-2002, 12:22 PM
snapper, unhooking the oil injection would void your warrenty.
With rev limits in the 6 - 7K range, the oil injection has been pretty reliable.
I have only smoked one powerhead in the past, oil injection failure! http://free.***boat.net/ubb/smile.gif So I do agree, after a year, loose the injection to be safe.
Pete, I know since 98 the computers store all the information, I had my 98 300 Promax checked, it had recorded all my rpm ranges and times for the last year.
The new motors will not release until it is broken in properly, for the 2001 300X, it released at about 20 hours. Held to 6000 rpms for the first 20 hours.
[This message has been edited by HavasuBarney (edited March 19, 2002).]

Screaming Pete
03-19-2002, 12:39 PM
Gary, What colors and gel scheme are you going with. This is the equivalent to giving birth for the river rat. Where will you be running most of the time?

snappertapper
03-19-2002, 01:16 PM
yes i know it voids warrenty but i am a mechanic so if it blows up i can fix my own stuff so im not too worried about it

Gary C
03-19-2002, 01:33 PM
I will be heading to Martinez most of the time. But will be trying everything(where) this year, out of Fallbrook, half way between SDiego and Riverside. Been 12 years since I have been in the water.
Tribal Orange Z with some Midnight blue. Gray windshield, bla bla bla http://free.***boat.net/ubb/smile.gif
thanks all for the continued help
Pete (guys), where do you go?

Screaming Pete
03-19-2002, 03:09 PM
Gary, Martinez y of course.. DCB W/300promax
mine was in HB entry level mach 22. They shot it after the tunnel boat ragatta last year in havasu and run with the river pigs. Most of us have park models in new pruitt
S/P

Gary C
03-20-2002, 08:04 PM
The Park models are sweet. I'll be staying with a friend of mine that has a house at ML, Bloom ring a bell???
He has that Limo Golf Cart, http://free.***boat.net/ubb/smile.gif, later,,,,

Screaming Pete
03-22-2002, 12:59 PM
Gary, I'm heading out to the river next weekend 29/30th will your boat be done by then and have you got your Insurance lined up I use Buzz at performance marine right at 1000.00 a yr
SP

Gary C
03-22-2002, 04:50 PM
Just got back, going next weekend, see ya there.
Dave will have the Boat done or else, lol.
Are you the first Park model on the left when you come into Fishers?

Screaming Pete
03-25-2002, 09:06 AM
Gary, Were the second one on the back row,arrow shed in back and a dcb mach 22
S/P