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Thread: 300EX build

  1. #1
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Apr 2011
    Location
    midwest
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    467

    300EX build

    I started a thread here before, but it was lost when the site crashed. SO I am trying again. The 300EX build started because we have property in McNaughton WI, and there are many ATV trails in the area BUT you have to be 16 to ride a 3 wheeler there. My Daughter is going to be 12 this summer and I decided to build her a Quad. I picked up a 300EX that needed a top end rebuild and while looking for parts I found a great deal on a barely running 300EX that cane with a spare motor that had a good top end. I put 1 good quad together with parts from both. When I was done I realised I had enough parts to put the second one together and this is it. I upgraded the front end to 400EX arms and 450R shocks. In the rear it is running a 350X swingarm and shock that was left over from my 350X build. This is where it is at now, I am waiting on the 350X shock, as Simply Suspensions is rebuilding it for me, and wheels/tires. It is running great, I had to go .060 over to clean up the bore, but I am running a 10.5 to 1 piston, FMF exhaust, and an old Poweroll air box lid. we both rode it around the yard yesterday and it feels pretty good. Enough B.S. on to the pics:






    I will be hitting Tapper up for a swingarm skid and make a frame and A-arm skids in the next few weeks.
    Honda and Mopar spoken here!
    85 ATC 350X Braaap 500cc!!
    85 ATC 250sx Wife's Wheels

    93 TRX300EX Loaner
    95 TRX 300EX Nikki's ride

    Ride Red

  2. #2
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Apr 2011
    Location
    midwest
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    467
    New wheels, tires, and final tune up done. With the High comp piston it pulls strong. Handles great and nice and stable with the 400ex arms.



    Honda and Mopar spoken here!
    85 ATC 350X Braaap 500cc!!
    85 ATC 250sx Wife's Wheels

    93 TRX300EX Loaner
    95 TRX 300EX Nikki's ride

    Ride Red

  3. #3
    Join Date
    Dec 2010
    Location
    Victoria, British columbia Canada / Winnipeg Manitoba, Canada
    --
    845
    looks great!
    MY TRIKES! :
    1- 85 250r NOS engine
    1- 1985 350x
    1- 82 250r + Parts
    1- 86 250es Big Red
    1- 85 200x
    2- 84 200es Big Red
    1- 84 200M !!MINTY!!
    1- 73 Atc 70 (project)
    MY Snowmobile's!!
    1999 Polaris Indy 440
    1999 Ski-Doo 583
    1993 Polaris Indy 500
    My Dirt Bike
    1986 Dr100
    AND A SCOOTER!! 1986 Honda Spree

  4. #4
    Join Date
    Oct 2007
    Location
    Minneapolis mn
    --
    4,067
    Looks good Murf!
    No trikes. Too old, too crippled. Unless I find one I can't live without!
    "You cant fix stupid" ~ Ron White
    My feeback link: http://www.3wheelerworld.com/showthr...ack-for-Thorpe

  5. #5
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Apr 2011
    Location
    midwest
    --
    467
    Raced a bone stock 400EX and beat it in a straight up drag race and I had ~60 Lbs on the guy. That little bit of porting and the HC piston seem to be working well.
    Honda and Mopar spoken here!
    85 ATC 350X Braaap 500cc!!
    85 ATC 250sx Wife's Wheels

    93 TRX300EX Loaner
    95 TRX 300EX Nikki's ride

    Ride Red

  6. #6
    Join Date
    Jun 2010
    Location
    House Springs MO
    --
    5,494
    I've always had a soft spot for these little guys and the 250x's also. Cool build keep up the good work.

  7. #7
    Join Date
    Sep 2010
    Location
    NEPA
    --
    7,049
    Very nice ! I love the paint scheme. Out of all of these I've seen,,I've never seen the bullet painted black. I Love it ! And the green accents. I bet she's tickled.
    Please help those who cannot help themselves.

    ALWAYS buying Museum quality machines,3 and 4 wheels. And any and ALL ,NOS parts,EVERY brand.

    I am turning my PM's Off,my Email is billsracing@hotmail.com,put 3WW in the subject. Thanx!

    Gun laws do not stop criminals. BULLETS do.

  8. #8
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Apr 2011
    Location
    midwest
    --
    467
    I got a "little" out of control with the powder coating... Everything is powdercoated including the engine.
    Honda and Mopar spoken here!
    85 ATC 350X Braaap 500cc!!
    85 ATC 250sx Wife's Wheels

    93 TRX300EX Loaner
    95 TRX 300EX Nikki's ride

    Ride Red

  9. #9
    jon jon's Avatar
    jon jon is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Mar 2011
    Location
    north carolina
    --
    420
    quick question.. i have a 300ex pit bike i like to play around on. and for some reason i keep snapping the frames. i noticed after the 2nd frame it likes to snap behind the foot peg. is this a known spot? and i also broke a swing arm?

  10. #10
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Apr 2011
    Location
    midwest
    --
    467
    I have never heard of any frame or swing arm problems on the 300ex. I have a 300ex swing arm I will send you for 25.00 shipped if you want.
    Honda and Mopar spoken here!
    85 ATC 350X Braaap 500cc!!
    85 ATC 250sx Wife's Wheels

    93 TRX300EX Loaner
    95 TRX 300EX Nikki's ride

    Ride Red

  11. #11
    jon jon's Avatar
    jon jon is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Mar 2011
    Location
    north carolina
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    420
    i have a few spares but it seems that thats were that always break..

  12. #12
    Join Date
    Nov 2008
    Location
    ontario
    --
    1,055
    they aren't real mx frames if your doing big jumps they need gusseting. and awesome build I'm a hobbyist powder coater myself just started last year doing small things. that thing looks WICKED!
    proud owner of a trx300ex quad and an 85 atc 70

  13. #13
    jon jon's Avatar
    jon jon is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Mar 2011
    Location
    north carolina
    --
    420
    i had a extra 350x axel that i put in it and did a 62 footer and it snaped, not sure how i broke the frame but the swinger snaped when i landed wrong.... will post pics if you guys wanna c

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