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Thread: '85R leaking petcock...still

  1. #1
    pismorat's Avatar
    pismorat is offline At The Back Of The Pack Arm chair racerFirst time rider
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    '85R leaking petcock...still

    So I am on the cusp of getting my newly rebuilt ATC250R running. The petcock leaked, so I got a new gasket (with the 4-holes) and now it is still leaking! Are there more parts I can replace in there or any tricks to make it seal? I'm getting down to the wire before a trip over Xmas that I really wanted to try this thing out on.
    '78 Honda ATC90 (132cc)
    '83 Honda ATC70 (88cc)
    '85 Honda ATC250R
    '86 Honda TRX200SX
    '04 Honda 400EX
    '73 Honda Trail 90
    '01 Honda XR70R (125cc)
    '16 KTM 500 EXC

  2. #2
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    Dec 2010
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    Pennsylvania
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    510
    did the tank look cracked at all? or stripped screws?

  3. #3
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    Tucson
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    When you say its leaking! where is it leaking from?

  4. #4
    pismorat's Avatar
    pismorat is offline At The Back Of The Pack Arm chair racerFirst time rider
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    It's leaking from out of the lever, not at the tank base, but from where the lever rotates, that's where I thought changing the 4-hole gasket would do the trick.
    '78 Honda ATC90 (132cc)
    '83 Honda ATC70 (88cc)
    '85 Honda ATC250R
    '86 Honda TRX200SX
    '04 Honda 400EX
    '73 Honda Trail 90
    '01 Honda XR70R (125cc)
    '16 KTM 500 EXC

  5. #5
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    Dec 2010
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    Pennsylvania
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    510
    i think youll need the whole petcock. it should not be too much

  6. #6
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    Oct 2010
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    There is a oring that goes around that handle (on off) valve replace that oring and put some grease on the oring very light. buy the whole kit from motoworld very cheap and works perfect!!

  7. #7
    Join Date
    Oct 2010
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    The four hole gasket is for shutting off the fuel too the carb and opening the reserve and on outlet.

  8. #8
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    Monroe MI
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  9. #9
    sbjones73's Avatar
    sbjones73 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    dam, see look at ye shall find !!!! information i needed, thanks guys !!!!!!!!!!
    84 250r gone,
    87 suzuki lt250r trail machine, gone to fund ice racer,
    85 250r ice racing project started !!!!!!

  10. #10
    Join Date
    Apr 2008
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    NW, IND.
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    I take steel wool and smooth the lever surface and lube lightly for a good seal.
    80' Honda CR80R
    78' Honda XR75
    77' Honda CT-70
    74' Honda CT-70
    75' Yamaha GT80 Enduro
    76' Kawasaki KZ900
    73' Kawasaki H1-500
    76' Kawasaki H1-500
    They always run best before they blow!
    Manuals: http://www.oscarmayer.net/atc/manuals/


  11. #11
    pismorat's Avatar
    pismorat is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Dec 2005
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    I'll check out that o-ring. There wasn't one when I took it apart, just a small washer/gasket thing and a wave washer. The o-ring sounds like it'd seal it up.
    '78 Honda ATC90 (132cc)
    '83 Honda ATC70 (88cc)
    '85 Honda ATC250R
    '86 Honda TRX200SX
    '04 Honda 400EX
    '73 Honda Trail 90
    '01 Honda XR70R (125cc)
    '16 KTM 500 EXC

  12. #12
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    Surprise AZ. In the garage working on trikes.
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    Quote Originally Posted by Lil Earl View Post
    i think youll need the whole petcock. it should not be too much
    Wow, do you own a third gen 250r? Talk about mis-information, these valves can be rebuilt for a $.95 o-ring and $10 four hole gasket. A new valve from honda is around $70. I posted the part numbers in the linked thread. All 250r owners should order a handful to keep Honda making them, even if they work for the trx250r. I seem to replace them once a season as they shrink, flatten, and get hard which makes them leak.

  13. #13
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    Oct 2010
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    Hell I even rebuilt the stock one on my 350x! I Know everybody is going say how the hell did you do that when there not rebuildable!!!! Very simple, you drill out the rivets replace the orings and put 3mm bolts back in it!! DONE.
    Last edited by badass350x; 12-21-2011 at 12:42 AM.

  14. #14
    pismorat's Avatar
    pismorat is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Think I got it fixed. I found two small, tiny holes in the lever that were leaking fuel out. I patched them up and put it back together with the seal and wave washer that were originally in it and its been holding gas. I'll keep the o-ring fir future use. See if I can get the thing fired up today for the first time! Thanks for all the help and p/n info.
    '78 Honda ATC90 (132cc)
    '83 Honda ATC70 (88cc)
    '85 Honda ATC250R
    '86 Honda TRX200SX
    '04 Honda 400EX
    '73 Honda Trail 90
    '01 Honda XR70R (125cc)
    '16 KTM 500 EXC

  15. #15
    Mosh is offline I'm the one with all the 2 stroke around here! The day begins with 3WW
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    I have read a few threads on here in the past and been told that the CR125 CR250 petcocks will fit the R tanks. They only have an Off and on..No reserve. They can be bought new on Ebay for 30 bucks..I have not done it myself yet, but I need one, and will be trying one out before too long.
    Here is where my long useless list of stuff nobody cares about should go...


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