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Thread: Atc 88 dyno results look!

  1. 12-09-2011, 12:45 AM #1
    81Rmachine's Avatar
    81Rmachine
    81Rmachine is offline First Time Rider Arm chair racerNew to the board
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    Atc 88 dyno results look!

    Hey guys just thought I'd share my dyno results with ya! I made a couple dyno runs a few weeks ago and finally found the time to post my results. What I've got is an '85 ATC 70. Everything I've put into it includes
    • 88 cylinder kit
    • 20mm Keihin carb
    • K&N filter
    • 5 angle valve job 30 degree back cut valves and ported original honda head (Machining and porting done by me)
    • Beatrice Cycle race roller bearing style cam
    • Cobra Pipe
    • Parts Unlimited chain
    • Kenda scorpion tires

    I've found Honda rated these at 3.5 horse and while I didn't get to dyno it stock I did dyno my '74 z50 which was about equivalent in power and that produced exactly 3.5 horsepower and 3 ft.lbs. at about 6500 RPM.
    The ATC after all modifications did quite a bit better making 16 HP at 10,200 RPM and 8.5 ft.lbs. at 8,500 RPM and as you can see by the dyno chart the torque curve is pretty broad in fact it never fell off to my surprise! Like I said I can answer any questions I did all the work myself from machining to dyno runs.
    Click image for larger version.  Name: Mini bike pwr.jpg  Views: 105  Size: 57.0 KB  ID: 137149Click image for larger version.  Name: Mini bike dyno.jpg  Views: 120  Size: 68.7 KB  ID: 137150Click image for larger version.  Name: IMG-20111104-00214.jpg  Views: 110  Size: 251.9 KB  ID: 137151Click image for larger version.  Name: IMG-20111116-00256.jpg  Views: 108  Size: 241.3 KB  ID: 137152
    '81 ATC 250r: IMS tank,Uni pod filter,Keihin PJ flat 38mm,Boyesen Pro series reeds,reed spacer w/ boost bottle,milled head,bored(.080),ported,machined CR exhaust flange,and Mugen pipe.PK +3 swingarm,2+2 axle,ITP rims,and 200X fork swap w/ polished tree.
    '03 CR 250R: FMF fatty w/shorty, Pro Taper top clamp
    '85 ATC 70: 88kit, race cam, ported head, 5 angle valve job, cobra pipe, 20mm carb...
    '73 ATC 70 roller, '80 ATC 110, '86 ATC 125m, '81 XL 500s, '71 Z50, '76 Z50 W/ Lifan 125
    '84 Tecate 3
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  2. 12-09-2011, 05:01 AM #2
    alexandros
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    looks interested, same power as the 150cc china-honda engines!!! any video of the atc to hear the engine?
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  3. 12-09-2011, 05:24 AM #3
    350xx
    350xx is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Wait...if a 88 makes that much power why would i get a china engine! hahaha
    85 350x
    84 tecate 3
    84 ATC70 http://www.3wheelerworld.com/showthr...C70-Buildup!!!

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  4. 12-09-2011, 07:36 AM #4
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    Trikeboss
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    16 HP with an 88cc kit @ 10k+ RPM... WOW thats just unreal! A 140cc lifan I had made like 8 HP....
    Last edited by Trikeboss; 12-09-2011 at 07:43 AM.
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  5. 12-09-2011, 08:44 AM #5
    PerryS
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    Id never thought that you could get 16hp out of a 70 motor with that list of mods. What kind of fuel are you running in it? I was gonna build a 70 with a 155 pitster, but that makes ne want to keep it genuine honda.
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  6. 12-09-2011, 09:14 AM #6
    murfman
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    Makes me wonder what you can get out of a 150cc or even 190cc motor. 20HP?
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  7. 12-09-2011, 09:27 AM #7
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    big specht
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    That sound alittle high out of a 88cc . Not sayin it is not possible. I've always wanted to dyno one of my 70's to see where there at, the problem with all mine is they are all push start differant flywheels. I have one that is all honda bored out to 90cc and a china one that is 160cc .
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  8. 12-09-2011, 12:42 PM #8
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    bigworm626
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    Unreal numbers.. but the dyno don't lie. thx for the input.
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  9. 12-09-2011, 12:53 PM #9
    55stone`
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    thats crazy high i would totally keep my 70 all honda and do this if i knew it made this much power
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  10. 12-09-2011, 01:35 PM #10
    hummbusa
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    Quote Originally Posted by 55stone` View Post
    thats crazy high i would totally keep my 70 all honda and do this if i knew it made this much power
    +1 I can't imagine a 88cc running with even the 110-120cc let alone the 140cc+ monsters
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  11. 12-09-2011, 01:51 PM #11
    PerryS
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    It must be running on alcohol or race gas to make that kind of power.
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  12. 12-09-2011, 01:52 PM #12
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    MrPretty
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    Wow! Thats just about as much power as a first gen 200x
    .

    1986 ATC 200s
    1985 ATC 250sx
    1984 ATC 200x
    1984 ATC 200s - Dads [Purchased New]
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  13. 12-09-2011, 01:57 PM #13
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    ezmoney1979
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    Seems like it would have to spin to 20,000 rpms to make that kind of power.


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  14. 12-09-2011, 05:33 PM #14
    Husky250
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    10,200 rpm???? WOW, that would scare the hell out of me! You definitely have some hair on that ass! I wouldn't have the guts to push it like that!
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  15. 12-09-2011, 05:42 PM #15
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    bigworm626
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    hats off 81R! big ups kid kash.
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