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  1. #1
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    225 promax break in procedure

    2000 promax .15 over all cylinders with WSM pistons what's the break in procedure?

  2. #2
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    Double oil first 10 hours, i go easy on them the first hour just to make sure everything is happy and then i just cruise around at 3000 to 3500 varying rpm often for the next 2 hours, then i start throttling it hard for short bursts once or twice every half hour until the motor has about 8 or 10 hours on it....then i go to my normal oil mix and beat the **** out of it....thats my way....you will probably get a hundred different opinions on this....I have seen guys go out and beat them from day one and i have seen guys baby them like there made of paper mache for the first 10 to 15 hours....
    1984 28 ghost twin 200 Yamah ProVs (SOLD)
    1997 21 Superboat Legend 250 VMAXXX (SOLD)
    2001 25 Concept CC 250EFI (SOLD)
    2002 24 Superboat Step 250EFI (SOLD)
    1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
    1994 20 Hydrasport 225 Optimax (SOLD)
    1998 27 progression Twin 225 Mercs (SOLD)
    2005 23 Kryptonite 300 Promax (SOLD)

  3. #3
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    breaking in motors is a real pain in the arse 3000 rpm for hours on end with little bursts i remember going around tomahawk lake a dozen times i think everybody thought i was nuts ,the water patrol stopped me and said wtf so now i go 1 hour or 2 then let er eat

  4. #4
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  5. Likes Frank Molé liked this post
  6. #5
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    32:1 of just normal Dino oil. Let it idle for an hour on the hose while checking for temp and the check valves that oil the upper bearing are working,timing and fuel pressure. Off to the ramp to idle-1200 rpm for another hour and set the tps where it's happy. Then go ride for 25 gallons of fuel varying from idle to 4500. Check water psi and head temps and plug color, make some short pulls and ride out another 25 gallons like before.

  7. #6
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    1st hr 32:1 oil not over 1/2 throttle or exceed 3500rpm, 2nd hr same but max of 4500rpm. Then only short bursts to max rpm for next 5 hrs.

    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"

  8. #7
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    I do mine fast without pussy footing around. Something kinda like this https://www.lmengines.com/engine-break-in-procedure/

  9. #8
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    I think if you would ask 100 people how to break in a rebuilt motor, you would probably get 100 different answers!!!
    death is certain; life is not


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