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Thread: Atc 350x rebuild. Help and suggestions

  1. #16
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743
    Wel here goes the rebuild. 12 to 1 wiseco , head done with a 5 angle valve job and some porting. Web 213 grind cam and stiffer valve springs. More pics as I progress.


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  2. #17
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743
    Piston ,head and cam installed
    This is going smoother than I expected. Makes me nervous.


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  3. #18
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743

    Atc 350x rebuild. Help and suggestions

    Engine in , valves adjusted , clutch tomorrow, carb jets and button everything back together. Hopefully fire it up Monday.


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  4. #19
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743
    Getting there. Installed new clutch today. Springs were almost 1/4Ē under minimum. Lost (ripped cell sort disintegrated) an o ring for the oil pump so Ordered that so maybe it doesnít start until next week lol. But Iím a few kicks away. Going riding this week (different bike) so sheís on hold till next week.


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  5. #20
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743

    She lives again!! Started up pretty quick. 5th kick. Holy crap with a 12:1 piston and no decompression cable. Who talked me into that? Oh that was me. Smokes a bit as expected. Getting better even after 20 minutes or so. Having trouble idling. Didnít mess with my carb settings at all but few like Iím too far out on pilot. Iíll play with it this weekend. Did take it for a very slow ride down the street and let me tell you about clutch springs. Wow. What a difference. Softer smoother and more pull. Get it tuned up this weekend maybe take it for a quick day ride this week. Break it in thanksgiving and should be ready to ride hard by the invasion.
    Still open to any tips questions or comments. Thanks


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  6. #21
    Join Date
    Aug 2008
    Location
    devore,ca
    --
    876
    Hey Shawn,

    Going to Rasor over Thanksgiving ?.
    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. #22
    Join Date
    Oct 2013
    Location
    Chandler, AZ
    --
    88
    Shawn,

    First off feel better - if you're not already. Secondly, this looks like a fun project! I'm not sure whether you've seen this video by ATV on Demand in which they set up a 350X for Motocross.

    https://www.youtube.com/watch?v=3BoVcUKNc_0&t=3s

    Even if MX isn't your focus, there is some interesting 350X info in the video. It is admittedly an over the top project, but maybe there are some ideas or information which may be useful for you. The price point vs point of diminishing returns scenario is up to you to determine! And I'd agree that spending more than a 450 conversion doesn't make sense unless you're an old school purist.

  8. #23
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743
    Quote Originally Posted by BOB MARLIN View Post
    Hey Shawn,

    Going to Rasor over Thanksgiving ?.
    No , unfortunately. Weíre going to ocotillo wells with a different group. Plan is to be at razor for New Years possibly , the weekend after the holiday 3rd to the5th I think.


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  9. #24
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743
    I have a technical question. A long time I ago I read somewhere (I think here but I can find it ) that you had to remove your decompression cable with a bigger camshaft on the 350x. Web (who made my cam) is unaware of this. Anyone have any advice? Kinda hard to kick without it to be honest. Damn 12:1 piston. Lol. Iím thinking I imagined that post now. Iíd hate to ruin my brand new valve train because Iím being a pansy and not wanting to kick this thing that hard. Also hate to wear my leg out in the bottom of a sand dune while my decompression cable collects dust in my shed. Thanks.


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  10. #25
    Ranvier is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Sep 2016
    Location
    Phoenix, AZ
    --
    305
    Quote Originally Posted by Shawn Powell View Post
    I have a technical question. A long time I ago I read somewhere (I think here but I can find it ) that you had to remove your decompression cable with a bigger camshaft on the 350x.
    I have never heard this. I would set the valve lash to the specs according to web then adjust the cable per usual.

  11. #26
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743
    Quote Originally Posted by Ranvier View Post
    I have never heard this. I would set the valve lash to the specs according to web then adjust the cable per usual.
    Yeah Iím beginning to think Iím confusing bikes with my XR400R/400ex Ďs. I know for a fact you delete those after a bigger camshaft. I just reinstalled the cable seems to be fine (and easier to kick) Iíve always been decent at adjusting that by following the service manual specs. Thanks.


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  12. #27
    Join Date
    Jun 2005
    Location
    Soutwestern PA
    --
    1,913
    I love reading 350X success stories. Can't wait to see it at Invasion!!

  13. #28
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743
    Well she runs , idles ok (still not perfect but Iím hoping that clears up as the engine breaks in?) Still smokes a little Wich is to be expected. Gonna take her on a very light ride tomorrow just to break in the rings I hope. Thereís a good spot Wich is pretty flat and should be empty tomorrow so I can just track back and forth in 3rd gear for a couple hours. Wish me luck.


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  14. #29
    Join Date
    Apr 2014
    Location
    Edmond, KS
    --
    1,685
    I'll bet it won't happen. you'll have to give it some juice at least once!

  15. #30
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    743

    Atc 350x rebuild. Help and suggestions

    Iím gonna put this here and in the brakes thread that got me going , but EBC still makes brake rotors for the 350x front and rear. I ordered mine today. About 110 each. Iíll post pics here when I get them. (Also new sintered tusk pads) hereís my email from EBC with part numbers


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    Last edited by Shawn Powell; 11-20-2019 at 09:28 PM. Reason: Canít spell properly

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