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Thread: Omc crossflow

  1. #1
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    Omc crossflow

    I have a 1997 omc 90 hp crossflow , is there any bolt on parts that will help performance , carbs , reed blocks , etc

  2. #2
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    Hate to say it but the best bolt on is a 135.
    Oh and if its really a 1997 its a looper.

  3. #3
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    Not much in bolt on parts, you could have the ports modified to a 115 and change the heads...
    He who leaves the biggest carbon footprint wins!!

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    its a 90 degree motor with removeable exhaust cover , you sure its a looper! build date 12/97

  5. #5
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    It's a crossflow, I have a 95. Best just to find an earlier 140 drop-on.

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    Our reeds will idle/accelerate better,early 80's heads will improve compression,crankcase stuffers help,remove airbox cover and jet up 1or2 thousandths on the mains,not too much more to be done without going into the motor and spending a lot more $.

  7. #7
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    Quote Originally Posted by faztbullet View Post
    Not much in bolt on parts, you could have the ports modified to a 115 and change the heads...
    The 1997 90 is ported the same as the earlier (crank rated) 115/140 motors on the intake side.

  8. #8
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    Bolt-on parts: Get a set of larger 110/115 carbs-with the 1 5/16" throats. Ditch the bathtub heads and find a set of very early 140 crossflow heads from the 77-78 timeframe. Install a set of 4 NLA rubber intake stuffers 322684. Composite reeds are a great addition. If you want to get into machining (teardown,) you can port it and add the exhaust bubble on the back of the engine. Your factory power pack will limit revs to 5800 rpm.

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    Chris Carson has a special reed to fit a special cage and with stuffers they work real well. Isn't that right Chris?

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    Freddy,your correct.I have the cut cages and reeds available,but I don't know that the motor in question could benefit from them,maybe a little overkill,what do you think,chris

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    Chris could you please PM me details of this special cage?

  12. #12
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    Jeff I sent Chris one of them. I think I have four of them left.

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