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  1. #1
    Member
    Join Date
    Nov 2011
    Location
    Atlanta GA
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    6,122

    SHO 250 engine temp

    My mechanic told me that my engine is not completely broken in since it is still making oil. I went out today with the intent of running it hard to get the rings to seat and the temp never went above 145. What's the hottest temp you guys have seen on these engines?
    17 Ranger Z520c Black Out Edition
    Yamaha 250 SHO

  2. Member
    Join Date
    Mar 2006
    Location
    Maine
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    3,368
    #2
    145 is right at where mine temperature runs at WOT on my 2015 Yamaha 250 SHO

  3. #3
    I ran my F90 for almost an hour wide open. Stopped for about 30 minutes, and then wide open back. It quit making oil after that. I think time wide open is more critical than temp cause it's only going to get so hot.
    2018 G3 Sportsman 17
    2018 Yamaha F90
    Garmin Ultra 106sv bow/console
    Ionic lithium batteries

  4. Member
    Join Date
    Aug 2016
    Location
    Varnell, GA
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    7,410
    #4
    145 is as hot as it will get.
    For proper ring setting: After it warms up, run it for 30 minutes at WOT getting the temp to 140-145, stop and fish for 30 minutes allowing cool down, and repeat the process, 30 minutes at WOT. Hope you are close to a large lake and it's not crowded, windy or choppy on the day you go. I did this to mine on a Christmas Eve.

  5. Member
    Join Date
    Nov 2011
    Location
    Atlanta GA
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    6,122
    #5
    Thank you gentlemen!
    17 Ranger Z520c Black Out Edition
    Yamaha 250 SHO

  6. Member
    Join Date
    Dec 2018
    Location
    DAYTON TN
    Posts
    65
    #6
    145 on long wot runs is all it will do

  7. Member
    Join Date
    Oct 2007
    Location
    Haughton, La
    Posts
    4,467
    #7
    It'll get to 145 almost immediately. To get engine to temp it has to run for long time under a load. The water gets to 145 quickly, for the pistons, cylinders, block etc takes longer.
    2014 Phoenix 721XP, 250 SHO, Bobs Action Jack, Dual Blades, 112 Ultrex, 2019 Lariat FX4 F150 Supercrew 4x4

  8. Member
    Join Date
    Apr 2016
    Location
    Goose Creek, SC
    Posts
    971
    #8
    I've seen 149 in the summer when it's HOT and the water is hot, but 145 is the goal.