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Thread: New to me 350x

  1. #1
    King Trikester is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Sep 2013
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    Canada, B.C, FSJ
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    435

    New to me 350x

    After 3 years of looking I finally found a 350x Click image for larger version. 

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    Now I need to figure out how to get more power out of it, it's seems like the engine is held back and has potential to make way more power

  2. #2
    Join Date
    Jan 2014
    Location
    Prescott az
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    720
    400ex head pipe and carburetor there is a thread on here somewhere covers all of it.
    [/SIGPIC]
    85 350x
    83 200x-sold
    ×2 85 200x-sold
    06 kx250f-sold
    86 tecate-sold
    86 tri z powervalved
    85 BIG red
    18 rmz250
    87 lt80
    19 ttr110

  3. #3
    King Trikester is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Quote Originally Posted by 6spdls1z28 View Post
    400ex head pipe and carburetor there is a thread on here somewhere covers all of it.
    I know that much, it has a small oil leak on the head that is driving me crazy, I'd like to put a cam in it since I have to take it apart. Anyone know where to get top end parts, I've seen the threads I'm just not sure where the parts are coming from.

  4. #4
    King Trikester is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I am in love, I took her out for a ride today after an oil change and carb clean. I keep going to the shop and just starring at her still amazed that I finally own one. I'm not sure if my tri-z has just ruined 4 strokes for me but it seems like the thing is "plugged up" it doesn't seem to have a whole lot of power. I'll be ordering a new air filter , 400ex Carb and head pipe, hopefully she wakes up a bit

  5. #5
    Join Date
    Aug 2014
    Location
    South Louisiana
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    1,915
    Does it smoke any? It may need a rebuild, or valve adjustment.
    "Roll on 3"

    RIP Ol' Deuce

    "Long Live the ATC"
    Building: ATCr125x
    Riding: ATC200sx
    "I am not a mechanic, mechanics get paid for this. I do it because I enjoy it."

  6. #6
    Join Date
    Aug 2008
    Location
    devore,ca
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    1,026
    Start with a compression test. All of mine that were low on power needed a bore job. All 3 of them were on the original bore when I got them. A bore job and a 10.25 to 1 piston brought them back to life for about $200.
    YAMAHA 450 HYBRID
    85 350X- RED
    85 350x -BLACK
    86 350x-WHITE (with Goki)
    85 250r
    83 atc 70
    84 atc 70
    84 atc 110
    09 yfz 450
    2006 Arctic Cat Prowler
    RZR XP 900

  7. #7
    Join Date
    Oct 2011
    Location
    Abbotsford BC Canada
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    93
    Thats a great looking 350X, the wait was worth it

  8. #8
    Join Date
    Mar 2010
    Location
    Freedom Township, MI
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    642
    Quote Originally Posted by BOB MARLIN View Post
    Start with a compression test. All of mine that were low on power needed a bore job. All 3 of them were on the original bore when I got them. A bore job and a 10.25 to 1 piston brought them back to life for about $200.
    Was that price with you doing it yourself or at a shop? I think I might need the same thing.
    Current Trikes:
    85 350x
    P3 (x2)

    Quads:
    2003 Polaris Predator 500
    1988 Yamaha Warrior
    2003 Polaris Predator 90

    Previous Trikes:
    84 Honda 110 (parts)
    85 Honda 110
    85 Honda 200x
    87 Honda 200x
    85 Honda 250sx
    KX 80 Trike conversion

    Gone and missed:

  9. #9
    Join Date
    Aug 2008
    Location
    devore,ca
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    1,026
    That price is doing the wrench work myself. Just down load the service manual pdf file. It's on this site somewhere, I think the members name is "oscar meyer", do a search. The piston kit from wiesco is all over ebay for around $130 including head an base gaskets. The bore job should run you between $50 and $70.
    YAMAHA 450 HYBRID
    85 350X- RED
    85 350x -BLACK
    86 350x-WHITE (with Goki)
    85 250r
    83 atc 70
    84 atc 70
    84 atc 110
    09 yfz 450
    2006 Arctic Cat Prowler
    RZR XP 900

  10. #10
    King Trikester is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    It desnt smoke at all, The PO did 0 maintenance on it judging by the oil. I'm going to adjust the valves today. It has a super trap on it, someone told me that they are adjustable, it seems like it runs good but there's blockage in the exhaust. I counted 13 plates on the end cap, is that normal? I don't know much about these can someone give me a quick rundown on how to adjust/how they work

  11. #11
    Join Date
    Aug 2008
    Location
    devore,ca
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    1,026
    350x's certainly don't normally run like they are plugged up. They actually have quite a bit of "pop" to them. They do get sluggish when the top end is wore out. They will start fine and run smooth, just won't have the power anymore.
    YAMAHA 450 HYBRID
    85 350X- RED
    85 350x -BLACK
    86 350x-WHITE (with Goki)
    85 250r
    83 atc 70
    84 atc 70
    84 atc 110
    09 yfz 450
    2006 Arctic Cat Prowler
    RZR XP 900

  12. #12
    King Trikester is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I haven't had any time to tinker with the 350x . I noticed that the head gasket is leaking as well as the decompression leaver leaks oil. Im assuming that would cause a loss of compression the decompression leaver also doesn't function so it looks like I'll be taking he head off and investigating.

    Where would I find new packing for my super trapp and what happens when you add/remove diffuser discs I've done some research with no luck finding info about these.
    Attached Thumbnails Attached Thumbnails image.jpg  

  13. #13
    f76's Avatar
    f76 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Supertrapp sells packing material through their website, eBay, other suppliers etc. Adding disks makes the exhaust louder and leans your air/fuel mixture. Removing disks quiets the exhaust and makes the air/fuel rich.
    85 Kawasaki KLT 160
    85 Kawasaki KLT 110
    82 ATC 70
    2000 Scrambler 500

  14. #14
    Join Date
    Aug 2008
    Location
    devore,ca
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    1,026
    The decomp not working is common in these trikes. Check to see if the lever by the kick starter moves when you move the kicker down. That's where most of them are broken.
    YAMAHA 450 HYBRID
    85 350X- RED
    85 350x -BLACK
    86 350x-WHITE (with Goki)
    85 250r
    83 atc 70
    84 atc 70
    84 atc 110
    09 yfz 450
    2006 Arctic Cat Prowler
    RZR XP 900

  15. #15
    Join Date
    Jun 2010
    Location
    Dracut Mass
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    307
    your 350x should want to wheelie in first gear to forth just throttle no clutch. well that's how mine runs anyways. I only have aftermarket head pipe and k&n filter on mine. maybe your gearing has been changed too? I don't know about the super trap but when I have my dg rcm on I lost a lot of low end power but had gained better range on top end. once I went back to stock muffler it started feel better down low with the added back pressure

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