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Thread: 83 ATC 70 oil leak

  1. #1
    Join Date
    Dec 2011
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    83 ATC 70 oil leak

    Ive got this atc 70 and it has started leaking oil from behind the flywheel pretty bad. Ive never seen this with a trike before.. Looks like it could only be two spots. Coming from behind what i believe is the condenser or coming from behind the shaft the flywheel goes on. I pulled the flywheel and it was oily in there of course. Is this an easy fix or a case splitter? It its not bad ill fix it but if not maybe a new frame to do a custom with. Thanks all help appreciated

  2. #2
    1984 honda 200s's Avatar
    1984 honda 200s is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Behind that fly wheel theres a seperate caseing from the case.... on that casing theres a round seal that rides on the crank. ''crank shaft seal''.

  3. #3
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    Oh okay ill check that out. So once that plate comes off the seal is right there!? Thats some good news i think i can fix it

  4. #4
    1984 honda 200s's Avatar
    1984 honda 200s is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Its an easy 20 minute fix once youve got the flywheel off. Pull off the casing and your seal is inserted into the center of that casing.

  5. #5
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    Thanks a bunch just got the stator plate out today and took the old seal out. It was leaking pretty bad but what can i say not bad for a $200 atc 70. Just ordered the crank shaft seal and the large ring that wraps around the plate. Gotta love DRATV! But thanks a lot for the help!

  6. #6
    1984 honda 200s's Avatar
    1984 honda 200s is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    No problem, ive been there to with an atc 200s.... Shorted out 2 good coils untill i finally noticed the shaft seal was cracked all around !
    Just be glad you didnt keep running it, it eventually would of shorted your ignition stator coil !

  7. #7
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    Oh thanks thats good info for me as well. My 85 200s is my daily rider so ill keep an eye out for that! But that 70 was leaking a drip of oil every half second, cant believe she was still a sparkin..

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