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Thread: Atc 350x rebuild. Help and suggestions

  1. #31
    Join Date
    May 2006
    Location
    My underwater lair
    --
    4,393
    Nice build!

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  2. #32
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    774

    Atc 350x rebuild. Help and suggestions

    Iíll leave this here but hereís some pics of my new rotors. (Pads as well and some stainless hardware ) They seem legit. Bolted up no problem and look nicer. My rear was bent , thatís how this started. Well I think my build is done. Hopefully this motor breaks in nice and quits smoking lol. Wish me luck and Iíll see you all at the invasion.
    Old vs new


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    Last edited by Shawn Powell; 11-22-2019 at 09:54 PM.

  3. #33
    Join Date
    Oct 2002
    Location
    Northeast
    --
    17,137
    Nice work bud! Great to see someone invest that kind of money in a motor, I've done it a few times, lol.

    Anyhow, that motor should not smoke 1 bit. I've built a few of these and there is a ring break in period, but I never had any smoke.

    Are you sure you got all the rings right?? Sometimes it's easy to make a small mistake with 4 stroke rings as you have 5 gaps to stagger...
    WHO IS Q?? WWG1WGA!!


    86 ATC200X Flatrack ( I may not be fast but this is one FAST 200X!!

    86 ATC350X Motocross, 86 ATC452X Flatrack!!

    07 Weekend Warrior Toy Hauler

  4. #34
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    774
    5 rings ? Your scaring me! Thereís only three on the wiseco , 2 compression one oil. Guys at race tech say it takes about a tank of gas. It only does it while cold. Once warmed up itís fine. Seemed to do it a lot less by the end of this weekend. Iíll keep an eye on it. I staggered the rings how wiseco said to and checked the ring gap before install.


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  5. #35
    Join Date
    Mar 2010
    Location
    Slidell, LA
    --
    4,682
    No there’s 5 rings and three ring slots. 2 compression, 1 oil expander and 2 oil rail rings for a total of 5. The oil rail rings sit above and below the oil expander ring in the third ring slot. If you missed putting the oil rail rings in, well, that sucks.
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  6. #36
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    774
    Quote Originally Posted by yaegerb View Post
    No thereís 5 rings and three ring slots. 2 compression, 1 oil expander and 2 oil rail rings for a total of 5. The oil rail rings sit above and below the oil expander ring in the third ring slot. If you missed putting the oil rail rings in, well, that sucks.
    Ok, that makes more sense. Then Iím good lol. I count the oil ring assembly as one ring but I see what you mean.


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  7. #37
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    774

    Atc 350x rebuild. Help and suggestions

    So I disassembled my fresh engine and I somehow managed to screw my oil ring joint stagger up. Fixed it. Started it a few times. No more oil smoke. Amazing. What a dummy I am. Also bought a new old tire from SCarr, and got some new heavier springs from race tech. Upon starting it up today I heard an exhaust leak. Figured it was from my gasket, wasnít, thereís a break in a weld on my header. So Iím probably going to buy an HRE header and a LEXX muffler for a 450r. Iíll post pics up when I get em.
    Half of my exhaust is here and the other half is on the way. Hopefully have it next week.


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    Last edited by Shawn Powell; 12-19-2019 at 08:34 PM.

  8. #38
    Join Date
    Feb 2017
    Location
    Corona CA
    --
    774

    Atc 350x rebuild. Help and suggestions

    So I finally got around to installing my new exhaust. Header is an HRE. Muffler is a 2007 450r Honda LEXX from Rocky Mountain Atv. Itís a pretty direct bolt on. I did have to purchase a gasket collar for a 2005 450r , but the muffler is a 2007 -2014. I also had to relocate / replace the rear brake master cylinder feed line from the reservoir (12$ stainless wrapped line from my local aircraft supply shop). The header comes with a second mount that bolts to the frame I wasnít able to use because it mounts in the same spot as my nerf bars. Still feels pretty solid.
    As far as performance holy heck Batman. It pulls WAY harder in the middle and bottom. This is possibly because I bought and installed a performance needle for my carb and raised the clip 1 spot up from where it was. I had a DG system and the LEXX is way quieter even without the quiet core insert. Itís a tad long and hits my six pack rack so I guess thatís going in the shed. But Iím pretty stoked. Hereís some pics.Questions or comments let me know.


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    Last edited by Shawn Powell; 01-18-2020 at 11:20 PM.

  9. #39
    Join Date
    Jul 2005
    Location
    Manheim PA 17545
    --
    5,139
    Your gonna burn up you rear master. Relocate it lower / or in the air box.
    1988 Warrior
    2002 Blaster
    2015 Rancher 420 dct eps irs

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