What CC motor is this?

Discussion in 'Motorized Bicycle General Discussion' started by red_tx, Jul 28, 2012.

  1. red_tx

    red_tx New Member

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    Hello, I just purchased this little guy and am not sure what the CC value is.. I am guessing 30-50CC. All i can find about the NT carb is that they make one for 48cc to 80cc. There is no placard on the engine that I can see anywhere to identify the motor manufacturer and or CC. No documentation came with the bike. It has a 77-301-1 "Oregon" spark plug. Runs great.. Want to know if I am illegal running her in Oregon.

    Pics here:
    http://gato.net/p/motobike

    Thanks in advance for any ideas!

    -red
     
  2. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    It's a 66 cc that comes with 6 mm head studs and there is really no difference in the NT carbs on a 50 cc or 66 cc.
     
    #2 MotorBicycleRacing, Jul 28, 2012
    Last edited: Jul 28, 2012
  3. red_tx

    red_tx New Member

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    MBR,
    Thanks.! How do you know other that eyeballing it?
    Are the 6mm head bolts the only way to tell?

    Thanks
    -red
     
  4. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    The 6 mm head studs are unusual for a 66 cc as they usually are 8 mm.

    That is my favorite motor made by NanTong JiaLi Gas Engine factory

    The other identifying clues are the unique shape of the fins on the head
    and the flat shape of the bottom of the transfer port castings.

    If you still have doubts the measurement between the head studs
    prove it's a 66cc too. The 50cc is smaller and no 50 cc looks like this.
     
  5. tooljunkie

    tooljunkie Member

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    i have to agree,i have both an 66 and a 48.the head looks like my 66 cc.
     
  6. Pilotgeek

    Pilotgeek New Member

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    If you can't tell what size it is, the cops won't be able to either. Keep it, be sensible with it, and tell everyone it's 48cc.
     
  7. cmanns

    cmanns New Member

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    +1

    I've only been here a few weeks and I'd say it was a cheap chinabay engine LOL. Looks bigger then 50cc, just a bit tho. .shft.
     
  8. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    The cc limit in Oregon is 30 something cc's so a 48 cc would be oversize.
     
  9. Allen_Wrench

    Allen_Wrench Resident Mad Scientist

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    Yeah. My guess would have been 66 cc too.
     
  10. DaveC

    DaveC Member

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    Considering all the Chinee did was to bore the 50's out to 66cc's you would have a very hard time determining the size of these motors. I've had both sizes and there's no difference externally I could determine. The majority of the parts are the same except for pistons, rings, and jugs. There are some 66's with the 6mm studs, too, further confusing the situation.scratg


    Oh, yeah, The "Oregon" plug means that it's from the Oregon chainsaw company. Their chainsaw bars and chains are world famous.
     
    #10 DaveC, Jul 30, 2012
    Last edited: Jul 30, 2012
  11. Nashville Kat

    Nashville Kat Active Member

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    The 6 mm studs were the standard a few years back- not sure when the 66 motors began most shipping with 8 mm studs- We dabble in an inexact science here sometimes I think because distributors get quantities of stuff and may take years to sell- so some of it is older new stock than others.

    I have a 66 with 6mm studs- bought spring '09 from bikeberry- I think the 8mm has been out a couple of years now- most retailers are more likely to be selling 8 mm 66 motors as time goes by.

    Someone said up above there was no difference in NT carbs- NOT SO. The NT SPEED carb for 66 motors came alomg about two years back- both that and the original NT- designed first for 50 cc motors- are being sold around. The 66 carb now says " SPEED" on the carb body up near the throttle cable and has it's own shut off valve- some old style can be found with the valve as well, so look for the word "SPEED". They are shipping for about $25 while the older carbs are maybe 10 dollars cheaper . The carb pictured above looks like the older NT 50cc carb- I'd upgrde that.

    I'm just getting ready to test a 66 speed carb on a 50 cc motor with a billet intake- should do well I suspect.
     
  12. red_tx

    red_tx New Member

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    Agreed, This is why I am going to have to sell it. I do not want a ticket.

    Thanks for all that responded helping me figure out the CC.

    -red
     
  13. Pilotgeek

    Pilotgeek New Member

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    How is anyone going to know? There are plenty of high performance 50cc's that crank out way more power than a 50cc china girl. Go to a place that engraves pets tags and make a 48cc tag for it. I highly doubt some over-zealous police officer is going to make you remove the engine and tech inspect it for displacement.
     

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