Spooky Ride

Discussion in 'General Questions' started by kerf, Dec 2, 2007.

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  1. kerf

    kerf Guest

    I went for a short test ride yesterday, thought I would see just what kind of top end this thing would do. I've just broken the engine in and haven't pushed too hard until now. I brought the bike to 40 mph with no effort and firewalled the throttle, it was frightening how quickly it hit 45 and kept accelerating when I dropped off the throttle. I believe the engine would keep accelerating until it broke. I guess thats as fast as it will ever go since I find 30 to be very adequate. Asphalt and my hide just don't mix.

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  2. srdavo

    srdavo Active Member

    that's awesome....to have that much power to spare. Is that a Staton gearbox?
  3. kerf

    kerf Guest

    Yes, 18.75/1 reduction with a 14 tooth on the gear box and a 16 tooth on the sprocket. The R460 is running a Walbro chain saw carburetor (factory) and is all the power I want. I'm just glad no idiot pulled in front of me during the test or we would not be having this discussion!
  4. srdavo

    srdavo Active Member

    tell us more about the R460....brand name....where to buy....how many cc's?

    was this a Staton kit engine? or did you buy it separately?

    sorry for all the questions...inquiring minds...haha
  5. kerf

    kerf Guest

    The engine is a Chung Yang 46cc, 4.2 HP @ 11K, 2.35 Ft. Lbs. @ 8K. It is a GoPed engine (Zenoah clone) I bought from Dave's Discount Motors. David Staton has bought some engines for testing but does not offer them at this time. They, like the Tanaka 47R Staton sells, are loud and need additional silencing if noise is an issue for anyone. That being said, I'm happy.
    Last edited by a moderator: Dec 2, 2007
  6. gone_fishin

    gone_fishin Guest

    very nice-looking setup...yes, we'll want a review for sure :cool:
  7. 5-7HEAVEN

    5-7HEAVEN Guest

    :cool: kerf, you are experimenting outside the box with DAVESMOTORS engines, and I commend you. There is beaucoup hp available, and the STATON gear chain box is the perfect match.

    Your gearing is presently set up for an 11,000rpm engine at 41mph. At 45mph, you were probably twisting to 12,100rpm.:shock:

    If you'd feel comfortable at 30mph, you could change from 14t to 11t outside the box. Then at 12,000rpm, the fastest you'll go is 35mph. At 30mph, engine turns at 10,300rpm.

    If your engine's peak torque range is at 8,000rpm, that'd be about 23mph. Right now, peak torque is at 30mph.

    And to think, that 11t sprocket is gonna cost you less than $15.:shock:

  8. Egor

    Egor Guest

    Just think that engine is stock. The Zenoa is a high RPM Engine. If you know anything about two strokes, they start running on pulses after a cert-en RPM. On a test years ago on a rotary valve engine at high rev's the valve stopped in the open position and it just kept going and going, no fade in HP.

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    Last edited by a moderator: Dec 2, 2007
  9. beast775

    beast775 Guest

    hey kerf

    is there anyway i could see your gear box chain tensioner ?its quite scary goin over 40 on a bicycle eh!:shock:
  10. gone_fishin

    gone_fishin Guest

  11. uncle_punk13

    uncle_punk13 Guest

    Eh, it ain't so bad... Heheheh!

    That's pretty dang awesome, andn I've had interest in the Staton set up, so good to hear it performs well!
  12. kerf

    kerf Guest

    My tensioner is a simple creature, fabricated from 1/4" aluminum bar stock and using a skateboard wheel as an idler. I picked up this idea years ago from a motorcycle shop, dirt bikers were using these wheels for their chain tensioners. It simplifies fabrication because the wide surface of the wheel make alignment a breeze. Being an opportunist, I used the existing holes in the Staton chain guard for mounting the tensioner. I hope this helps someone.

    Attached Files:

  13. JemmaUK

    JemmaUK Guest

    Im not surprised it went like the wind using that motor - its about the most powerful one thats standard fit for gopeds and such...

    Im interested in that exhaust - did that come with it or was that a home made project ... it gives me the idea that plastic plumbing joints and piping might make a good silencer ....

    boring fact:- the word plumbing comes from the roman plumbum meaning the metal we call Lead - used for its pliability it only had one drawback - it slowly kills you...

    Jemma xx
  14. 5-7HEAVEN

    5-7HEAVEN Guest

    :cool:kerf, I like the fact that you're using a chain tensioner. You don't need to add or remove links when changing to a different size sprocket.

    I also like how you mounted your goped fuel tank. Did you make your brackets, or is that the original goped tank mounts you're using?

  15. kerf

    kerf Guest

    I built the straight through glass pack muffler from copper tube and fittings. The 3/4" exhaust pipe is bored to form a baffle tube and goes all the way through the 1 1/4" outer jacket. On a prototype, I used tin solder and it failed due to heat, I had to use a copper brazing alloy with a 1400 degree melting point. I doubt that PVC or even CPVC would handle the temperature.

    I'm working on another project using 1000 degree silicone exhaust tubing. You might want to look into that.
  16. kerf

    kerf Guest

    The tank mount is a 16 ga. steel plate that bolts to the trans. I then drilled the plate to accept bolts through the mounting holes in the tank.
  17. beast775

    beast775 Guest


    thanx for the pics!!! ive noticed on the staton gear box that the chain trajectory from a to b is quite minimal,anything over a quarter inch from the standard chain adjust parameters,,,i got horsepower loss.:shock:
    Last edited by a moderator: Dec 5, 2007
  18. kevbo

    kevbo Guest

    The engineering guidlines* for roller chain suggest that this is always very desireable for vertically arrainged sprockets. The timing chains on motorcycles and car engines almost always have a tensioner on one side and fixed guide on the other. (unless they are silent chain)

    Without the guides, some wierd resonances can happen at certain speeds. Gravity does the job for horizontal runs.

    *Reference: Way more than you ever wanted to know about roller chain
  19. kerf

    kerf Guest

    Thanks for the link, it's absolutely more than this old head can absorb but still very useful. As my gear box does 90% of the reduction (18.75:1), at least my chain is running relative slow. That said, I believe the spring loaded tensioner is a better way to keep slack out of that #41.
  20. 5-7HEAVEN

    5-7HEAVEN Guest

    :cool:The tensioner will come in handy when changing to a slightly smaller OR larger sprocket on the STATON box. No chain links will need to be added or removed.