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Thread: difference between 250 sx and 250 es

  1. #1
    Join Date
    Oct 2012
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    maine
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    8

    difference between 250 sx and 250 es

    what is the difference between these two engines, is everything the same on them both or anything different.how can you tell them apart

  2. #2
    Join Date
    Feb 2011
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    Sarnia, Ontario, Canada
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    The engines themselves are completely interchangeable in the two machines..my 85 250ES currently has an 87 250SX power plant.

    Click image for larger version. 

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    That being said there are some minor mechanical differences that make some of the parts not interchange such as: timing chain tensioner and starter drive gears..

    Also there is a minor difference in the transmission gear ratios..the SX has a slightly higher ratio that in combination with the slightly higher differential ratio accommodate the OEM tire size difference..25" on BR, 22" on SX

    The only visible external difference between the two engines is that the BR engine is silver and the SX engine is black..
    Current toys..
    1986 Honda 350X..trail bomb!
    1985 Honda 250SX..my main mudder
    1985 Honda 250ES..Back in Black Trike
    Current non-trike toys:
    1990 Honda TRX300FW
    1995 Seadoo GTX
    1998 Polaris Indy Lite 340(Nearly new looking)
    1998 Polaris Touring 500
    1998 Club Car (electric)

  3. #3
    ShaftDrive225dx is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Nov 2012
    Location
    washinton st.
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    206
    doug thats a beautifull big red there, havnt seen many in that kind of shape and i like the black wheels on it too looks sharp all around! I usualy like the sportier trikes so normaly i would go with sx over the es models but if it looks like yours ill take it over sx lol!

  4. #4
    Join Date
    Feb 2011
    Location
    Sarnia, Ontario, Canada
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    3,415
    Quote Originally Posted by ShaftDrive225dx View Post
    doug thats a beautifull big red there, havnt seen many in that kind of shape and i like the black wheels on it too looks sharp all around! I usualy like the sportier trikes so normaly i would go with sx over the es models but if it looks like yours ill take it over sx lol!
    I usually prefer the SX too..you'll probably like this 87 I scored a few months back. A lucky CL find and being quick on my feet!!

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    But yeah I had this rough ES..I put the wheels and tires on it and it just made it look worse. Like someone who puts bling rims on a rusted out Caprice..just drew attention to the ugly!!

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    So I popped in my NOS 250SX engine..the rest just came together. It's fun when guys are cheering you on..keeps the money and the momentum going..

    Thanks..
    Current toys..
    1986 Honda 350X..trail bomb!
    1985 Honda 250SX..my main mudder
    1985 Honda 250ES..Back in Black Trike
    Current non-trike toys:
    1990 Honda TRX300FW
    1995 Seadoo GTX
    1998 Polaris Indy Lite 340(Nearly new looking)
    1998 Polaris Touring 500
    1998 Club Car (electric)

  5. #5
    ShaftDrive225dx is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Nov 2012
    Location
    washinton st.
    --
    206
    Right on your right that sx is pretty! Yea it does give some motivation when people acknowledge your work or finds! keep on it man bike looks great.....

  6. #6
    Join Date
    Dec 2008
    Location
    ohio
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    24
    only difference is the obvious sx engines are black es are silver

  7. #7
    Join Date
    Oct 2012
    Location
    maine
    --
    8
    thanks for the info guys, the engine was painted black when i got it with a cheap paint that is now starting to peal off,it looks to be an es from what the silver is showing through

  8. #8
    Join Date
    Apr 2012
    Location
    USA
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    4,133
    Get the engine number off the casting, that will tell you for sure. I don't know the numbers off hand, but I'm sure the info is out there in the internet.

    I think doug covered basically everything with the differences in the engines lol.

  9. #9
    Woodsrider's Avatar
    Woodsrider is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Feb 2009
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    Eastern Passage, NS
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    238
    I don't remember clearly, and maybe someone can add to this, but I remember having two engines apart on the bench , and I'm positive that the end of the crankshafts where the centrifugal clutch lock nuts go, were different diameters....I could not switch the lock nuts between these two engines. The part that I don't remember , is if I had two SX engines , or one of each on the bench. I found that very odd and wondered why Honda would do that. Anybody else experience this?

  10. #10
    Join Date
    Apr 2012
    Location
    USA
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    I have swapped the entire clutch assembly from a 250es (i think a 86) into a 85 250sx engine. I don't think I tried to swap the nuts, but the actual shaft size is the same, atleast it fit quite well for me lol.

  11. #11
    Join Date
    Oct 2012
    Location
    Somerset County PA
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    Isn't the 250es a big red and the sx is its own model
    Quote Originally Posted by Howdy View Post
    Yea, looked like a monkey ******* a football. LMAO
    Howdy



    Currently Own-

    84 250R My Baby/Project
    83 Yamaha 225dx
    79 Honda Twinstar - Big Ole Turd

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  12. #12
    Join Date
    Feb 2011
    Location
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    Quote Originally Posted by ColtonGG33 View Post
    Isn't the 250es a big red and the sx is its own model
    Not at all..the SX is just a smaller, slightly more sporty version of the BR..

    All the same engineering and mechanical design, just a different frame geometry, suspension and body style.

    Anyone with a 250ES really should buy a 250SX..(or vice versa). The two machines are a great contrast of riding characteristics..
    Current toys..
    1986 Honda 350X..trail bomb!
    1985 Honda 250SX..my main mudder
    1985 Honda 250ES..Back in Black Trike
    Current non-trike toys:
    1990 Honda TRX300FW
    1995 Seadoo GTX
    1998 Polaris Indy Lite 340(Nearly new looking)
    1998 Polaris Touring 500
    1998 Club Car (electric)

  13. #13
    Join Date
    Dec 2007
    Location
    Quebec,Canada
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    1,014
    This difference is applicable to the year,sx and es 85 are the same,sx and es 86+ are the same but different from the 85
    They also change the centrifugal clutch at a moment,there is 2 model of spline,

    Quote Originally Posted by Woodsrider View Post
    I don't remember clearly, and maybe someone can add to this, but I remember having two engines apart on the bench , and I'm positive that the end of the crankshafts where the centrifugal clutch lock nuts go, were different diameters....I could not switch the lock nuts between these two engines. The part that I don't remember , is if I had two SX engines , or one of each on the bench. I found that very odd and wondered why Honda would do that. Anybody else experience this?

    1986 ATC500X
    1985 ATC250SX
    1985 ATC200X
    1985 ATC250R
    1986 ATC250R
    1984 ATC250R
    1981 ATC70
    1984 ATC70
    1985 ATC70
    Custom built ATC70 / 250R laydwon swap
    1986 ATC250SX FATCAT

  14. #14
    Join Date
    Dec 2007
    Location
    Quebec,Canada
    --
    1,014
    Are you sure the engine are exaclty the same? Pretty sure the trany have a different ratio on the 2 first gear

    1986 ATC500X
    1985 ATC250SX
    1985 ATC200X
    1985 ATC250R
    1986 ATC250R
    1984 ATC250R
    1981 ATC70
    1984 ATC70
    1985 ATC70
    Custom built ATC70 / 250R laydwon swap
    1986 ATC250SX FATCAT

  15. #15
    Join Date
    Feb 2011
    Location
    Sarnia, Ontario, Canada
    --
    3,415
    Quote Originally Posted by atc500x View Post
    Are you sure the engine are exaclty the same? Pretty sure the trany have a different ratio on the 2 first gear
    Actually the ratio is slightly different thru all the gears.

    But not enough to stop an SX motor from working great in an ES..
    Current toys..
    1986 Honda 350X..trail bomb!
    1985 Honda 250SX..my main mudder
    1985 Honda 250ES..Back in Black Trike
    Current non-trike toys:
    1990 Honda TRX300FW
    1995 Seadoo GTX
    1998 Polaris Indy Lite 340(Nearly new looking)
    1998 Polaris Touring 500
    1998 Club Car (electric)

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