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Thread: about keihen PZ 19mm carb & such from colorado kite & ski

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    about keihen PZ 19mm carb & such from colorado kite & ski

    -----cheap colorado kite & ski carbs keihen PZ 19mm-I recently tried one of these carbs because one of mine had serious erosion in the filter section of the carb---- anyway I've noticed on some other threads people mentioned the single nipple inlet issue with these carbs & some with gas in containers in backpacks and such-- I'm not sure if it's been said before ,but the dual inlet petcocks for the later carbs will fit these also-- the ones from beatrice & hondamintrail will work-- , I intially tried this carb because with shipping it was only $20.50 from the auction + $16.00 for the petcock-- I 've seen lately beatrice has rebuidable dual petcocks cheaper now at $12.99--when purchased I didn't realize the size difference & I am surprised how well this carb runs on the stock motor because I am a firm believer in not over carbing things, my bronco is running an aluminum headed 302(y303 heads & E303 cam) with only a 500 cfm weber carb & performer intake-- I constantly get told that carb is too small ,but I went with the volumetric air formula charts you see on the net------- for the pz19 granted I haven't hooked up an exhaust analyzer ,but throttle reponse is snappy & no black smoke so I assume it must not be way too rich
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    Last edited by 76-bronco-J; 08-18-2006 at 08:28 PM.

  2. #2
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    The PZ19 carb also runs well on a 86cc, 97cc and a 108cc engine. They seem to be very good carbs, the engines are easy to start,and good performance throughout all rpm.
    1972 Honda CT-70H 97cc 4 speed
    2004 CT-70H -Black Clone W/124cc Motor
    2005 CT 70H -Red Clone W/86cc Motor
    2002 Honda XR-70 W/ 108cc Motor
    2005 Honda CRF-70 W/124cc Motor

  3. #3
    racerx's Avatar
    racerx is offline Super Moderator
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    If they are genuine Keihin carbs, I'm not surprised. Keihin is a quality product. Ease of starting has more to do with low speed jetting than anything else. If these carbs are jetted slightly on the rich side as-delivered, then I'd expect to see the results you've gotten. As long as the WOT jetting isn't too lean, you're home free.

    As to automotive carburetion, oversizing only works with EFI throttle bodies. A 650cfm carb would be the automotive equivalent of that PZ19. Even on a 500hp motor, it probably won't make more than 2% difference compared with an 850. Contrary to popular belief, displacement has little to do with carb sizing, power output and volumetric efficiency are the key considerations. A 5 liter engine and an 8 liter engine both making the same horsepower will both flow the same amount of air at max output.

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    P.C.'s Avatar
    P.C. is offline 120cc
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    Im not 100% sure the pz 19 is genuine.but it runs good.it has a cheap plastic choke lever,the end cap for the choke lever assy pops off.jets are hard to find.the bike shop i go to had keihen jets but they didnt fit the pz.hmmmm..the on off for the fuel is right next to the exhaust..ouch!fuel lines are pointing to the front of the bike..but for the price it is worth it.getting a intake to match the port would probably help too..stock intake port is smaller where the carb hooks up.seems to me its a clone carb.
    C.E.G. 71 STROKER H 110cc

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    These are clone/knockoff carbs and not genuine keihn.
    Like PC said you also need the intake as the stock ct intake is not wide enough and the center hole is way too small ( 14mm? vs 19mm). They perform well on the Chinese motors and on the Honda engine I stuck one on.
    Basically the only reason to use one would be price.
    1972 Honda CT-70H 97cc 4 speed
    2004 CT-70H -Black Clone W/124cc Motor
    2005 CT 70H -Red Clone W/86cc Motor
    2002 Honda XR-70 W/ 108cc Motor
    2005 Honda CRF-70 W/124cc Motor

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    daxman's Avatar
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    Walbro pz22

    I recently bought a Walbro pz22 carburator. It is made in China (in the carburator it reads "Walbro standard of JAPAN", plastic bag says "walbro, tianjin industries, made in China").

    The size of the venturi was a dissapointment, about 17mm wide and about 19 mm high. I would call it a 18mm carburator. The carburator hole is 22 mm at the point where it meets the intake manifold.

    I was going to use it in my 110 cc stroker, but I'm not sure if I'm going to install the carburator. I thing it is too small to get best performance.

    Edit: Now after checking the original keihin is the same style: venturi is 12x14 mm, and it is supposed to be 17 mm? PZ22 is 15x19 mm, so it is bigger than the original 70cc carburator. I don't know when I will test it.
    Last edited by daxman; 08-22-2006 at 03:12 AM.

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