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Thread: 1981 Atc 250r Mugen Build

  1. 12-04-2017, 12:01 PM #16
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    ironchop
    ironchop is offline Power User The day begins with 3WW
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    Nice score...there goes all your spare change for the foreseeable future.

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  2. 01-09-2018, 10:09 AM #17
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    yaegerb
    yaegerb is offline yaegerb The day begins with 3WW
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    Speaking of using spare change for the forseeable future....

    I picked up these neat additions over the holidays to ensure rival will live up to its name....

    Click image for larger version.  Name: C3044C93-3CD0-4D15-952A-2FBFF06ED2B4.jpeg  Views: 41  Size: 1.92 MB  ID: 249150Click image for larger version.  Name: 56DA68C4-6588-4EA3-BA52-860AE8FADA7F.jpeg  Views: 40  Size: 768.0 KB  ID: 249151Click image for larger version.  Name: 7C5063BD-DBB0-44ED-B544-0F536915686A.jpeg  Views: 45  Size: 685.5 KB  ID: 249152Click image for larger version.  Name: D52E6667-02D4-4285-893F-93235D35FC2E.jpeg  Views: 42  Size: 687.8 KB  ID: 249153Click image for larger version.  Name: 3C014DA5-06CB-4012-A8E4-E0848697BDB4.jpeg  Views: 43  Size: 765.7 KB  ID: 249154Click image for larger version.  Name: DF58A00F-93DD-4649-ABB7-5523CE2DDB25.jpeg  Views: 51  Size: 766.5 KB  ID: 249155Click image for larger version.  Name: 0F2284C4-A025-4C4F-B5AD-BF219182EA67.jpeg  Views: 48  Size: 780.1 KB  ID: 249156Click image for larger version.  Name: E434FFBE-E204-494A-96E2-F7B7FAAB66DB.jpeg  Views: 39  Size: 1.89 MB  ID: 249157Click image for larger version.  Name: BA8DCCFF-C7E2-4D1F-9AF6-A2F905557A2A.jpeg  Views: 41  Size: 1.90 MB  ID: 249158
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  3. 01-09-2018, 02:13 PM #18
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    bkm
    bkm is offline Power User The day begins with 3WW
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    Where does a feller find a piston for that beast?

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    '86 ATC 250R, Build Thread http://www.3wheelerworld.com/showthr...highlight=250r
    '86 "Factory Tri racing" Tri-Z http://www.3wheelerworld.com/showthr...b-Top-Tank-ect
    Pile of Tecate Parts

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  4. 01-09-2018, 03:21 PM #19
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    yaegerb
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    Quote Originally Posted by bkm View Post
    Where does a feller find a piston for that beast?

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    Great question. I have two leads. First is working with another member to have wiseco make some more Pistons in a group buy and the second is a little place in jolly old England that I have yet to call.
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  5. 01-09-2018, 05:15 PM #20
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    Footy
    Footy is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Let me know if you need any parts. A friend of mine has a 1982 model that he is parting out. No engine or carb though.
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  6. 01-13-2018, 11:43 AM #21
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    Quote Originally Posted by bkm View Post
    Where does a feller find a piston for that beast?

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    Denny at Flotek, he will deck the cylinder for a TRX 330 piston
    Please help those who cannot help themselves.

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

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  7. 01-13-2018, 05:02 PM #22
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    yaegerb
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    Quote Originally Posted by atc007 View Post
    Denny at Flotek, he will deck the cylinder for a TRX 330 piston
    I couldn’t bring myself to deck a Mugen cylinder
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  8. 01-13-2018, 09:19 PM #23
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    HondaRidr
    HondaRidr is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Is flotek still around?

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  9. 01-13-2018, 10:11 PM #24
    Doug8765
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    Nice find !!


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  10. 01-14-2018, 12:00 AM #25
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    yaegerb
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    Quote Originally Posted by HondaRidr View Post
    Is flotek still around?

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    I don’t believe so.
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  11. 01-09-2020, 11:53 PM #26
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    yaegerb
    yaegerb is offline yaegerb The day begins with 3WW
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    Update 1/9/20

    Been 2 years and some change but I have made decent progress the ol' 81.

    The engine is nothing short of a beast. A ton of work (mechanical and aesthetic) has gone into the motor making it a fire breather once again. I scored a piston from England last year and then sent the cylinder off to get re nik'd. I then sent the piston and crank down to crank works for a complete overhaul and balance. Once I started assembly of the motor it went along pretty well until the piston was hitting the cases. I had to take .080 off the intake skirt which was only 1.5 grams which presents no issues to my balance job from crank works. The pressure test revealed the head was severely warped so I hand lapped it back to form. It holds 6psi all day if want it to. A couple big shout outs to ironchop and chris parciello. I scored a new intake from chris and then massaged it for better flow. I then had ironchop cnc grooves the NOS elsinore 500 intake so I could use O-rings. Here is some timeline pics and how it sits today. She won't be like this for long though. I have the swingarm coming in a couple weeks along with a 41.5MM taper bore PWM. My custom PEP, ZPS shock is also being made. I would like to have it back on 3 by late spring. Enjoy the pics.
    Attached Thumbnails Attached Thumbnails Mugen Assembly_2.jpg   Mugen Assembly_3.jpg   Mugen Assembly_4.jpg   Mugen Assembly_11.jpg   Mugen Assembly_12.jpg   Mugen Assembly_8.jpg  

    Mugen Assembly_9.jpg   Mugen Assembly_5.jpg   Mugen Assembly_6.jpg   Mugen Assembly_7.jpg   Mugen Assembly_13.jpg   Mugen Assembly_15.jpg  

    Mugen Assembly_17.jpg   Mugen Assembly_16.jpg  
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  12. 01-10-2020, 12:21 AM #27
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    That thing is going to be a work of art. It's sad......back in the heyday of this place, this thread would be 10 pages long already.
    '86 ATC 250R, Build Thread http://www.3wheelerworld.com/showthr...highlight=250r
    '86 "Factory Tri racing" Tri-Z http://www.3wheelerworld.com/showthr...b-Top-Tank-ect
    Pile of Tecate Parts

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  13. 01-10-2020, 08:25 AM #28
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    ironchop
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    Man, that looks fantastic already!

    Are you going to get it dirty ever again?



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  14. 01-10-2020, 08:53 AM #29
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    yaegerb
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    Quote Originally Posted by ironchop View Post
    Man, that looks fantastic already!

    Are you going to get it dirty ever again?



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    You bet buddy! This one will be strictly a race bike.
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  15. 01-10-2020, 09:02 AM #30
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    Quote Originally Posted by bkm View Post
    ...... It's sad......back in the heyday of this place, this thread would be 10 pages long already.
    Well it's hard to keep the lights on around here considering how much competition there is with Fakebook and all the Mugen builds going on in there.......................



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