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Thread: Atc300x aka 300ex in 350x

  1. #16
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    5,742
    Scored another 300ex and 400ex i robbed parts off than sold. Here is the full 300ex brake assembly on the 350x swinger. Not sure I will keep this setup or use my yz426 frobt caliper and 250r tiny rotor setup. I tried 400ex but it was loose on the 300ex/350x carrier. Plus the 400ex caliper angles way back so the carrier bolt was interfering. Either the 400ex carrier is just a tad larger od or the aluminim 400ex brake stay was evenly worn. I'd rather use steel anyway.

    Mounted a 300ex shock which I like better. Ill make some spacers to check alignment...chain alignment seems to be off .25" which some spacers will fix that.

    Lastly I took off a oem 400ex muffler.

    If i choose the 300ex shock I'll buy an elka. The 350x one I fully have rebuild and relaved but I'd almost rather have a longer travel shock like the 300ex.
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    Last edited by oldskool83; 05-29-2021 at 07:58 PM.

  2. #17
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    5,742
    Switched back to 350x shock... I did drill and tap frame for 12mm bolt so if I want to change to 300ex shocks in future I can. As of now I went back to the 350x shock and adjusted it a bit more. Bought new front fender hardware, powder coated and polished up triples...now to put the stem back in. So much massage this or that. Turns out I need a 300ex CDI box. The black back on the harness was only for reverse. Time to go find another 300ex to buy rob parts off or then sell.
    Last edited by oldskool83; 06-02-2021 at 02:14 PM.

  3. #18
    patriot1 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Mar 2020
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    Palestine, AR
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    356
    Awesome thread. Thank you

  4. #19
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    5,742
    38mm oem 400ex carb i had...yeah this don't fit worth crap. Barely ckears frame. Oem 300ex carb boot won't work. Cant take 32mm boot and stretch to 38mm...however a billet aluminum adapter and radiator hose works. I would recommend oem 300ex carb that way you have splices from air filter to carb. If using 300ex carb and air boot air box moves back an inch, which is nicer anyway. Ill sleep on what I want to do. If not ill buy another 300ex for parts!
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  5. #20
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    5,742
    Acquired another 300ex for cdi. Designed cdi bolt on bracket and cutting up two oem cdi holders from 300ex.

    Next issue is 300ex valve cover breather needs rotated 30 degreed since it directly hits 350x frame. This build is basicly a full design job. The details can get you in trouble so its constant mock ups. Hopefully this helps future 300x copiers
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    Last edited by oldskool83; 06-09-2021 at 08:27 AM.

  6. #21
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    5,742
    Battery stuff all found a home. Not fun. However nothing is in the way after 20 mock ups. I'm about tired of this project!
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  7. #22
    Join Date
    Oct 2002
    Location
    Northeast
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    17,438
    What was the deal with the 300EX rear shock?? Same overall length eye to eye just different diameter?? Same spring weight?? Resi or no resi?? Just curious... I think guys use the 300EX fronts on the 250SX rears.

    As far as your chain, you probably centered the motor based on the couple of mounts that lined up.

    If it's only 1/4" you can probably space it out, I'm sure you know Louis makes the 350X to 300EX sprocket adapter which could be trimmed down but I think you like making your own stuff. If you just need an aluminum ring I can help, not sure if HRE is still around to help.
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  8. #23
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    Hre is doing his own thing. I'm doing not adding to his 6 month back log of work. I work laser fab shops and work at a machine shop too. Been building on my skills by trial and error.

    Oem 300ex shock has no res. It's also about same length but will mount different.. It does make the machine ride way softer which is great if your under 150lbs. Currently I sold the project to a new buyer who wants to complete the swap. I saved the rear end to use on my 300ex I'm building too. I'm happy to stop messing 3 hours a night dreaming up things to build this. I wanted to spend more time with my daughter and less time in garage. I have 3 300exs now just from parting 12 machines out this year. I learned alot.

    Off to build a 300ex trail machine now. I honestly don't have 1 machine I really want lol...but hey I'm a great dad.

    Who knows what I'll buy next. I've bought 6 machines in 4 weeks...I kept cool parts from them.

    For now I feel like the obsession stopped. I needed to break up with the build.
    Last edited by oldskool83; 06-22-2021 at 09:40 PM.

  9. #24
    jasong_10's Avatar
    jasong_10 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Apr 2020
    Location
    Croghan, New York
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    420
    Sorry to see the project end but understand the reasoning completely, they only grow up once.
    Jason

    85 ATC 250R - restored stock other than 18" rears, nerf bars, Honda key switch, 14T front sprocket, and white tank and plastics (except rad shrouds)

    87 ATC 200X - restored stock other than 18" rears and nerf bars

    84 TRX 200 - rough but complete budget restore for wife and eventually daughters to bum around on

    Eton Viper 50cc - oldest daughter's current ride

  10. #25
    Join Date
    Jul 2010
    Location
    Arkansas
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    2,196
    Thanks for the input otherwise.

    Mine is still summer hibernating in back of a project pickup, leaking the diesel I filled the engine up with. Maybe this winter I'll pick up the torch.
    The story of three wheels and a man...

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