4 stroke with sickbikeparts jackshaft

Discussion in '4 Stroke Bicycle Engines & Kits' started by toker_ace, Nov 2, 2013.

  1. Onenonlynicky

    Onenonlynicky New Member

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    Been trying to find the specs for the engine I have, but there seems to be none, It's 79cc 4 stroke from the company called Gasbike, I bought it from Bikeberry.
     
  2. xXNightRiderXx

    xXNightRiderXx Active Member

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    I can provide those for ya, here's what I remember of it:
    Max power: [email protected]
    Max torque: 3.5ft/[email protected]
    Max rpm: 3600rpm
    Displacement: 78.5cc
    Compression ratio: 8:1

    There should be an Owner's manual inside the engine packaging that contains all the specs. I have the gasbike 79cc engine, and am modifying it for the most power I can get without going crazy about it. Ive heard these things can get up to 7hp.
     
  3. waynesdata

    waynesdata Active Member

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    I am playing with the idea of a 212cc with 3d clutch and single speed freewheel.

    ------------------------------------------------------------

    No after looking at Youtube much too wide.
     
  4. MotoMagz

    MotoMagz Well-Known Member

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    Yep very wide and the clutch set up needs some messing with.Here are 2 other options 79cc and a 212 . You can also do the 79cc set up in a 212.
     

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  5. waynesdata

    waynesdata Active Member

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    I do not like the feel of my rigid fork just peddling around. When I upgrade to dual crown down hill fork I will look at the issue again. No point buying caliper mount twice.

    I have a rule for myself to never motorize a bike I would not want to peddle around.
     
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  6. Onenonlynicky

    Onenonlynicky New Member

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    The
    The exact setting spec I'm looking for is what feeler guage size is needed to set both gaps for each valve...that's what I can't find, the valve lash clearance
     
  7. xXNightRiderXx

    xXNightRiderXx Active Member

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    #67 xXNightRiderXx, Oct 13, 2019
    Last edited: Oct 13, 2019
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  8. Onenonlynicky

    Onenonlynicky New Member

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  9. xXNightRiderXx

    xXNightRiderXx Active Member

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    Everywhere I look, valve lash is set to .004-.006 on the stock cam. "79cc valve lash" should.be the search term that brings up everything, including Necros instructable.
     
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  10. curtisfox

    curtisfox Well-Known Member

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    If it will help, the old slandered is 8 I & 10 E. Newer Briggs specks is 7 & 9, somewhere i red these are tighter more like 5 & 7 thow. ..........Curt
     
  11. curtisfox

    curtisfox Well-Known Member

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    Also would be the same as Honda GXH 50...........Curt
     
  12. waynesdata

    waynesdata Active Member

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    I wonder what happen to Necros? "4 stroke with sickbikeparts jackshaft" would make a nice instructable.

    KC used to say "gears change everything"
     
  13. xXNightRiderXx

    xXNightRiderXx Active Member

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    It's Necromancer and KC who inspired me to build my current shifter.
     
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  14. xXNightRiderXx

    xXNightRiderXx Active Member

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    So, considering the weight of the new sprocket, and the wrong size at that, I'm going to be going through sick bike parts for the chainring adapter, and attaching a 30t chainring. I will be drilling out the holes for larger bolts from Home Depot to handle the engine power. I will also meticulously align those sprockets for the straightest possible line. However, since I have already purchased a new chain to fit the sprocket, I will be using that until I can afford the chainring and adapter.
     
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  15. waynesdata

    waynesdata Active Member

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    I am also concerned about things breaking under this kind of engine power. I am looking for a way to reinforce the gear on the seat post. I may use horizontal dropout frame to prevent the rear axle from coming out under load.
     
  16. xXNightRiderXx

    xXNightRiderXx Active Member

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    I'm running with a qr skewer with vertical dropouts, and I haven't had an issue with the axle moving under load. Of course, that doesnt mean it can't happen, I'm just sayin it's unlikely, especially once you apply enough torque to the nuts/skewer.

    Gear on the seatpost? I'm gonna need a picture for that one. If youre talkin about reinforcing the seat tube though, just drop another seatpost down in there.
     
  17. waynesdata

    waynesdata Active Member

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    I think the part I have circled could twist under the kind op power we will be putting out.
    Brace.jpg
     
  18. xXNightRiderXx

    xXNightRiderXx Active Member

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    To be honest, it might. I mounted mine the way i did because it wouldnt fit any other way, but it seems really stable.
     
  19. MotoMagz

    MotoMagz Well-Known Member

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    Do you mean twist like move or twist like twisted metal?
     
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  20. waynesdata

    waynesdata Active Member

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    Yes. Looking for ways to make that part of sickbikeparts kit stronger / more reliable.
     
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