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  1. #21
    PWCToday Regular
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    Re: 657 vs. 657x engine comparison

    Quote Originally Posted by Mr. Bill View Post
    Can you say for a fact that someone has not swapped the cases or swapped the mag housings ?

    Does your stator have 4 wires or 5 wires ?

    Alright so I went threw and looked over all my parts for ya...and this is what I've discovered. My boat is 1994 Seadoo Speedster twin 657.

    Ok my stator has 5 wires and my mag housing states 657x and has casting number 6810090

    My junk cylinder I replaced...grabbed it in I remember verifying all cylinders had the same cast number. which is 6913382. This junk cylinder has 93 stamped on it. and the new one I bought has a 95 so I assume that's a year of manufactured.

    The heads I remember looking at before sending them off and they are the same as the picture in the previous post...about which head is which.

    My cranks I'm not sure about cause I never really looked at them I just mailed them off.

    My carbs also match up for a 657x

    So I've came to the conclusion either in 94 they used what 657 cases they had left and built the 657x with them. Or someone when rebuilding at some point changed out both sets of cases and took the time to port the intake.

    Now I was also talking to shagy959 a member here who said he had cases. and he looked up his carbs and cylindes as well as the heads and all the parts are 657x but the cases match mine! looking like a normal 657

    So I think they just used what cases they had left over before making the new cases. I'll post pics later

  2. #22
    PWCToday.com Is My Home Away From Home Mr. Bill's Avatar
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    Re: 657 vs. 657x engine comparison

    Are you basing this on the location of the pulse fitting ? If so, don't.
    Bill O'Neal
    www.watercraftmagic.net
    For repairs and/or parts and appointments only:
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  3. #23
    PWCToday.com Is My Home Away From Home Mr. Bill's Avatar
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    Re: 657 vs. 657x engine comparison

    I think you got the 657X motors that were used in the GTX's and '95 SPX's. They are not the same 657X's that came in the '94 XP's.

    If the build date on the clyinders is '93, the clyinder came on a 1994 model.
    Last edited by Mr. Bill; 02-22-2012 at 12:30 PM.
    Bill O'Neal
    www.watercraftmagic.net
    For repairs and/or parts and appointments only:
    626 914 9509 M-F 10 am to 5 pm PST, ask for Chris.

    Always speak your mind because those who mind don't matter and those who matter don't mind.

  4. #24
    PWCToday Regular
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    Re: 657 vs. 657x engine comparison

    Quote Originally Posted by Mr. Bill View Post
    I think you got the 657X motors that were used in the GTX's and '95 SPX's. They are not the same 657X's that came in the '94 XP's.

    If the build date on the clyinders is '93, the clyinder came on a 1994 model.

    I agree. Basically from all of my parts that I have I have the same parts as a 657x that everyone else has except my cases are different. Everything else is the same including the exhaust in the carbs. I look forward to getting my cranks back and looking at them to see if I have a 657 or a 657x crank. But all in all so far I have the 657x except by my cases as of right now.

    and even though I have the normal 657 cases they have been ported out...but the other things that had been changed like at the top of the case what I think is a oil drop hole for the bearings is still the small size.

  5. #25
    PWCToday.com Is My Home Away From Home Mr. Bill's Avatar
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    Re: 657 vs. 657x engine comparison

    You will not have the weaker cranks because they only came in the 1993 engines.
    Bill O'Neal
    www.watercraftmagic.net
    For repairs and/or parts and appointments only:
    626 914 9509 M-F 10 am to 5 pm PST, ask for Chris.

    Always speak your mind because those who mind don't matter and those who matter don't mind.

  6. #26
    PWCToday Newbie
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    Re: 657 vs. 657x engine comparison

    I've got a 95 speedster with the 657x and running into this 1mm difference. does anyone know the cylinder casting number on the 657x jug? or the 657 jug?

    someone did some rebuilds on this prior and no clue what they were doing.

    I'm thinking they did some mix matching but not sure. I ended up finding a pair of brand new OEM jugs for the 95 657x on eBay but once received noticed the seller bought out an old dealer and part number was off by a few (they didn't have box anymore!!!).

    the ones I bought were actually 1mm smaller then the ones I took off the 657x I have. my mechanic suggested getting copper gasket to build up the 1mm difference + gasket thickness and bring it up to what I had to start. thoughts?

  7. #27
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: 657 vs. 657x engine comparison

    If you have the 1mm shorter cylinders you could just find a used head for that setup.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
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    '99 Yama GP1200 65U 61.8 GPS
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    '96 Seadoo HX 717 53.13 GPS
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  8. #28
    Resident Guru hafweigthr's Avatar
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    Re: 657 vs. 657x engine comparison

    I think the 657 has a cylinder part # 6913380 and the 657X used #6913382 cylinders. I can verify tonight if I think about it when I get home. The rule I follow is make sure you are using a 657 cylinder with 657 head and 657X cylinder with a 657X head otherwise you may have problems.
    Last edited by hafweigthr; 03-23-2015 at 02:01 PM.
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  9. #29
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    Re: 657 vs. 657x engine comparison

    Does anyone know if the 94 Mikuni oil pump will work on the 95 657x? From the pics they look the same but have not seen the 94 pump in person. Part number is off by one digit 290996723 vs 290996724

  10. #30
    PWCToday.com Is My Home Away From Home fitty650sx's Avatar
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    Re: 657 vs. 657x engine comparison

    Can anyone fix the photos?
    Stuck in the '90's - Vintage Retarded

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