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Thread: trx250r with 350x engine anyone got one??

  1. #1
    Team ATC's Avatar
    Team ATC is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    trx250r with 350x engine anyone got one??

    hey guys i got rid of my 450r last fall and been wanting to get something to ride i found a 250r with a 350x motor in it anyone got one? Just looking for some input on them thanks
    85 200x
    85 350x
    85 250r
    Tri zinger

  2. #2
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    they were the hybrid of the 90's and a very popular conversion. 4 wheel action or dirtwheels had a acticle about doing it on a trx250x/300ex, it isn't too good in the trike fantatics mind. Leager used to make a frame to accept a 250x/300ex/350x motor and use 250r for the rest of the bike. If it was done on a stock 250r frame, it had a problem of derailing the chain. The problem lies in placement for the motor, done correctly, the bottom frame rails need to be dropped, so the sprocket lines up w/ the center of the swingarm pivot point. Many didn't do this and the sprocket was too high up.

  3. #3
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    Does anyone remember the exact issue? I've been trying to sell my trx250R and no takers on the left coast and I've got spare 350X engines and have thought about this in the past.

  4. #4
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    I have a aftermarket chassis 350RX, well at least for now I do. It's getting a YZ426 with a big bore soon....lol
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM

  5. #5
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    Quote Originally Posted by RapidRick View Post
    Does anyone remember the exact issue? I've been trying to sell my trx250R and no takers on the left coast and I've got spare 350X engines and have thought about this in the past.
    The issue with a stock framed RX is that the motor sat too high and the chain got looser as the swingarm swings up, and the chain flys off when you land. I have seen loads of RX's over the years and I would not even think about owning one with a stock frame. The 350x tears the R frame apart when properly ridden....just my opinion.
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM

  6. #6
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    Quote Originally Posted by SWIGIN View Post
    The issue with a stock framed RX is that the motor sat too high and the chain got looser as the swingarm swings up, and the chain flys off when you land. I have seen loads of RX's over the years and I would not even think about owning one with a stock frame. The 350x tears the R frame apart when properly ridden....just my opinion.
    Maybe you can help. I have a gussetted 87 frame that the lowerframe has been modified and the 350X engine has been lowered in it. It's a full gusset job. Has all custom built motor mounts. Guy I got it from said some guy did them back in the 90's. Said he built 100's of them. You guys got any info?
    1969 Trail 70
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    1986 ATC250R X 3
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    1987 ATC200X
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  7. #7
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    years ago i rode i that was 4 sale, the engine ran great but didnt have enough power for all the extra front end weight. wouldnt even wheelie. im planning on a 660 raptor engine into a tri-z conversion as soon as i get all the parts. good luck.

  8. #8
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    Quote Originally Posted by 124356q View Post
    years ago i rode i that was 4 sale, the engine ran great but didnt have enough power for all the extra front end weight. wouldnt even wheelie. im planning on a 660 raptor engine into a tri-z conversion as soon as i get all the parts. good luck.
    That's the other problem with a stock framed RX, they spin like mad and wont carry the front end.

    My aftermarket RX is semi hard to keep the front end down when leaving the hole.
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM

  9. #9
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    Quote Originally Posted by Tyler 54 View Post
    Maybe you can help. I have a gussetted 87 frame that the lowerframe has been modified and the 350X engine has been lowered in it. It's a full gusset job. Has all custom built motor mounts. Guy I got it from said some guy did them back in the 90's. Said he built 100's of them. You guys got any info?

    Everyone and there brother were building RXs back then so it's hard to say.
    80s......185 atc, Yamaha tri-moto 200, 85 200x with tons of work
    90s......89 Suzuki quad racer 250 (raced 250 A class for 6 years, late 90s.. custom framed 250x with long travel shocks and a built 350x motor.... built Honda 110
    00s...... chomeoly framed 350 RX with all the goodies (thanks to my bro)
    2012.....Replaced the 350x motor for a 444cc YZ426
    WWW.HREATV.COM

  10. #10
    baycitysteve's Avatar
    baycitysteve is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Scan.jpgheres a pic of my buddys 350rx and my ss350x at the pontiac silverdome right befor the amateur supercross that i won ,, hahaha he looped out on a burm and broke a tie rod .. great combo , a good motor builder can make them just about as fast or faster than the new 450's !!
    ss350x

  11. #11
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    Quote Originally Posted by baycitysteve View Post
    Scan.jpgheres a pic of my buddys 350rx and my ss350x at the pontiac silverdome right befor the amateur supercross that i won ,, hahaha he looped out on a burm and broke a tie rod .. great combo , a good motor builder can make them just about as fast or faster than the new 450's !!

    Dude.. Sweet mullet!!!!!!!
    1969 Trail 70
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    1986 ATC250R X 3
    1986 ATC200X
    1987 ATC200X
    2012 Polaris RZR

  12. #12
    300rman's Avatar
    300rman is offline My other user 3WW ID was Nitebiker07. Teaching quads a lesson
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    Quote Originally Posted by 124356q View Post
    years ago i rode i that was 4 sale, the engine ran great but didnt have enough power for all the extra front end weight. wouldnt even wheelie. im planning on a 660 raptor engine into a tri-z conversion as soon as i get all the parts. good luck.
    That will be an interesting project. Having reverse would be sweet.

  13. #13
    baycitysteve's Avatar
    baycitysteve is offline At The Back Of The Pack Arm chair racerFirst time rider
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    yea that was along long time ago !! kinda funny looking back !! me and my buddy feel the big companys copied are idea and a few other peoples
    idea that 4strokes can be fast and beat two strokes . we always got laughed at when we showed up at a race till we smoked them !!
    Quote Originally Posted by Tyler 54 View Post
    Dude.. Sweet mullet!!!!!!!
    ss350x

  14. #14
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    ya, thats what i was thinking.. but im a bit concerned about the extra weight...

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