Power goes flat past 2/3 throttle (pacemaker 2)

Discussion in 'Whizzer Motorized Bicycles' started by lemont1, Nov 12, 2010.

  1. lemont1

    lemont1 Member

    I have a 2001 Pacemaker 2. The bike was still in a box when I got it 3 weeks ago so the carb must be standred issue with this year wc1 motor (I'm guessing) it has it's own pepcock, if that helps. Can't find a model or brand on it. I have it running and it idles and runs good but when I get it reved up it goes flat at about 2/3 throttle. Is this a main jet issue? If so does any one know where to get parts for this carb? I pulled the main jet,soaked and cleaned it but no change. Any advice or knowladge would sure help. Thanks in advance!
     

  2. WC1 Carb

    Hi the slide (piston inside carb) has an adjustable needle in it, if you pull the tiny e-ring, and put it down a notch, this will lift the needle, and richen the mixture.

    You can experiment, by partially applying the choke to see if it needs to be richer, or, a better way, read the spark plug for rich or lean condition.

    Mike
     
  3. lemont1

    lemont1 Member

    Thanks, I have the clip on the lowest notch now, which is where it idles and runs the best except as I said the last 1/3 throttle. The air/fuel mixture seems to be ok (plug is not fouling or white).
     
    Last edited: Nov 12, 2010
  4. mason_man

    mason_man Active Member

    There is also a restrictor sleeve inside the intake port that can be removed,see pic.Timing should be advanced one tooth.Is it a automatic or slip clutch? can you post a pic of your bike Ray
     

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  5. lemont1

    lemont1 Member

    Ray, It is a slip clutch. I will try the timing today cause this is something I can probably handle. I know just enough to be dangerours. Here is a photo of the carb. Do you know the brand? It took a while to figure out attachments, but I got it now.
    Dan.
     

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    Last edited: Nov 13, 2010
  6. lemont1

    lemont1 Member

    Well, I was wrong. Any tips for pulling the fly wheel? Is the bolt reverse Thread? Recomendations for holding the flywheel while I (try to) remove the bolt? I am very limited on tools but am willing to purchase what ever I need.
    Dan.
     
  7. KilroyCD

    KilroyCD Active Member

    Mason Man was referring to advancing the cam timing by one tooth. You will need to take the side plate off (make sure to drain the oil first) to get to that. He also mentioned the restrictor plate. I don't suggest removing it but to open up the inside diameter to match the diamter of the intake. The restrictor needs to be in place to serve as a heat barrier, and is made of a material that works well in that regard. It can be possible to boil the gas in the carb without the restrictor in place.
    If opening up the restrictor does not work, you may have to play with different size jets.
    The carb incidentally is probably a Kie Han carb.
     
  8. lemont1

    lemont1 Member

    Thanks for the information!
     
  9. mason_man

    mason_man Active Member

    Hi lemont1 That is one nice looking whizzer.here's pic of timing and intake restrictor.the muffler is also very restrictive.there's other areas that can help improve the flow as well.whizzerusa.com can help with you with parts or Quenton.Hope this helps Ray
     

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  10. lemont1

    lemont1 Member

    Thanx Ray, I got stuck working the weekend so i will have to wait a bit to try any of these suggestions, bummer cause it's a real nice day. Sounds like the intake is the first thing to try from what I have read while searching for information. There is ALOT of great stuff (advice and knowledge) available at this site! Thanx for the pic's.
    Dan.
     
  11. lemont1

    lemont1 Member

    Advanced the timing one tooth per the picture and what a differance! Rode 30 miles and noticed a huge increase up hills and just smoother acceleration all around. Still feels like I should get a little more top end but I think I will wait awhile before making any more changes as hearing about the possibility of over heating when removing the restrictor makes me nervous. What is the average top speed with a stock wc1? I am getting 28 to 30 wide open on flats (which is fine by me, just courious).Thanx again for the help!
    Dan.
     
  12. KilroyCD

    KilroyCD Active Member

    Ther speeds you are getting with the restrictor in place are pretty good, actually. The restrictor was meant to keep top speeds at or around 25mph to comply with moped regs in a number of states. Don't remove the restrictor, but open up the inside diameter to match that of the intake and you should see even better performance.
     
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