ZDZ 80RV New Carb  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> ZDZ & RCS Support >> ZDZ 80RV New Carb
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ZDZ 80RV New Carb - 12/18/2007 1:18:16 PM   
gapple12


 

Posts: 317
Joined: 1/20/2006
From: San Antonio, TX, USA
Status: offline 		Ok, I have been pulling my hair out trying to fix my Walbro WJ-38 carb on my ZDZ 80RV. I have rebuilt it and checked it over and over without fixing my problem. So on that note I called ZDZ and they do not carry the WJ-38 anymore. I also searched threw the net and found nothing. Now the nice lady at ZDZ told me the WJ-71 will work fine. I noticed the 71 has a larger Venturi, 18.25 compared to my 17.46. What can I expect from this new carb is my question? Will I have many issues switching to this larger carb? Thanks......
       Post #: 1

RE: ZDZ 80RV New Carb - 12/18/2007 1:41:32 PM   
juanes1969


 

Posts: 373
Joined: 5/10/2005
From: Comayaguela, , HONDURAS
Status: offline 		gapple12, I used to have the old BING carb on my 80RV and it was a pain to start. I got the WJ71 fron RCShowcase and all the problems wth the engine went away. It starts easily and it is easier to adjust. Now the 5-5-1 starting method works like clock work.
If I remember correctly the throttle and coke levers are in the same place as the old carb (please correct me if I`m wrong)
You won`t be dissapointed with the walbro 71. JM2C.

John

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(in reply to gapple12)
       Post #: 2

RE: ZDZ 80RV New Carb - 12/18/2007 2:36:14 PM   
gapple12


 

Posts: 317
Joined: 1/20/2006
From: San Antonio, TX, USA
Status: offline 		Thanks juanes1969, I appreciate your reply. I will give the WJ-71 a try. Got to love these forums.....

(in reply to juanes1969)
       Post #: 3

RE: ZDZ 80RV New Carb - 4/9/2008 2:32:51 AM   
Andrew_S



Posts: 210
Joined: 8/3/2002
From: Gaston, SC, USA
Status: offline 		How much was the new carb?

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What do heli''''s and ceiling fans have in common? When the blades stop turnin, You start sweatin ! ! !

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       Post #: 4

RE: ZDZ 80RV New Carb - 4/9/2008 5:16:55 AM   
juanes1969


 

Posts: 373
Joined: 5/10/2005
From: Comayaguela, , HONDURAS
Status: offline 		About 70 bucks. The engine spins a mejzlik 26x10 at 6400 rpms and starts easy.

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       Post #: 5

RE: ZDZ 80RV New Carb - 4/9/2008 10:08:46 AM   
lennyk


 

Posts: 565
Joined: 12/8/2001
From: Port of Spain, FL, USA
Status: offline 		Are you using a regular muffler or pipe/can and getting these rpms ?

I also find my engine is hard to start.

quote:

ORIGINAL: juanes1969

About 70 bucks. The engine spins a mejzlik 26x10 at 6400 rpms and starts easy.


(in reply to juanes1969)
       Post #: 6

RE: ZDZ 80RV New Carb - 4/10/2008 4:01:30 PM   
juanes1969


 

Posts: 373
Joined: 5/10/2005
From: Comayaguela, , HONDURAS
Status: offline 		I`m using the Supersonic pitts muffler that I ordered with the engine. A Menz S 26x8 runs at 6700 rpms but I like the way it pulls better with the mejzlik 26x10.
the walbro 71 makes it easy to start.

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       Post #: 7

RE: ZDZ 80RV New Carb - 4/15/2008 9:22:19 PM   
bmoney69


 

Posts: 81
Joined: 11/8/2004
From: newark, DE, USA
Status: offline 		hmm, mine is also hard to start (especially when it''s hot.....forget it) and i''ve also found that inverted and knife edge the engine sags and goes fat at less then half throttle.....anyone else have this problem? i wonder if the new carb will take care of this

(in reply to juanes1969)
       Post #: 8

RE: ZDZ 80RV New Carb - 4/28/2008 5:20:56 PM   
DKMILLETTE


 

Posts: 6
Joined: 9/6/2006
From: TAMPA, FL, USA
Status: offline 		my son's ZDZ Super 80 is a **** to start too, I asked him to check and see what carb is on it. he has only had it since january and during a flight the spark plug blew out and stripped the threads in the cylinder. Has anyone ever heard of that happening before? Other than these problems it runs great, tons of power once it is running, I think the spark plug needs to engage more threads. ZDZ People need to look at this problem.

(in reply to bmoney69)
       Post #: 9

RE: ZDZ 80RV New Carb - 4/28/2008 7:21:05 PM   
mtwister


 

Posts: 691
Joined: 11/3/2005
From: Salem , OR, USA
Status: offline 		I have an older ZDZ 80RV with a Bing carb. It's the easiest starting gasser at the field. If you guys lean out the low speed needle to optimum then it will be a little harder to start. Try opening the low speed about an 1/8 turn or a little less and retry. The Bing carbs work great.

(in reply to DKMILLETTE)
       Post #: 10

RE: ZDZ 80RV New Carb - 4/28/2008 7:23:48 PM   
mtwister


 

Posts: 691
Joined: 11/3/2005
From: Salem , OR, USA
Status: offline
quote:

ORIGINAL: DKMILLETTE

my son's ZDZ Super 80 is a **** to start too, I asked him to check and see what carb is on it. he has only had it since january and during a flight the spark plug blew out and stripped the threads in the cylinder. Has anyone ever heard of that happening before? Other than these problems it runs great, tons of power once it is running, I think the spark plug needs to engage more threads. ZDZ People need to look at this problem.


I read about your plug problem on your other thread and it's not a problem with the engine. The problem is the plug gets over tightened and it pulls the threads. The plugs only have to be tightened until the crush washer is crushed. If you pull the plug and you don't replace the washer, then you're asking for trouble. You're hounding on an engine that has an impeccable history, that produces more power and has less troubles than ANY other 80cc class engine.

(in reply to DKMILLETTE)
       Post #: 11

RE: ZDZ 80RV New Carb - 4/28/2008 7:58:54 PM   
DKMILLETTE


 

Posts: 6
Joined: 9/6/2006
From: TAMPA, FL, USA
Status: offline 		How about the starting problem it's very difficult to start by hand the first time each day.
it acts like it burns off the prime each time it trys to start sometimes it takes 15 to 20 min.to start, very fustrating even some of the compitition guy's can't start it.

(in reply to mtwister)
       Post #: 12

RE: ZDZ 80RV New Carb - 4/28/2008 8:06:25 PM   
mtwister


 

Posts: 691
Joined: 11/3/2005
From: Salem , OR, USA
Status: offline
quote:

ORIGINAL: DKMILLETTE

How about the starting problem it's very difficult to start by hand the first time each day.
it acts like it burns off the prime each time it trys to start sometimes it takes 15 to 20 min.to start, very fustrating even some of the compitition guy's can't start it.


Richen the low speed needle just a hair.

(in reply to DKMILLETTE)
       Post #: 13

RE: ZDZ 80RV New Carb - 4/28/2008 10:05:48 PM   
lennyk


 

Posts: 565
Joined: 12/8/2001
From: Port of Spain, FL, USA
Status: offline 		Richening the low needle will definitely help because I used to start after 6-6-1 but I tuned it according to a guide by mfuess and its working real good, no midrange burble, smooth transition etc but its now like 15-8-1 to start

(in reply to mtwister)
       Post #: 14

RE: ZDZ 80RV New Carb - 4/28/2008 10:14:18 PM   
mtwister


 

Posts: 691
Joined: 11/3/2005
From: Salem , OR, USA
Status: offline
quote:

ORIGINAL: DKMILLETTE

How about the starting problem it's very difficult to start by hand the first time each day.
it acts like it burns off the prime each time it trys to start sometimes it takes 15 to 20 min.to start, very fustrating even some of the compitition guy's can't start it.



Also, do a quick double check that the timing is right. It's on RCshowcases site.

(in reply to DKMILLETTE)
       Post #: 15

RE: ZDZ 80RV New Carb - 4/29/2008 11:02:11 PM   
3D Toy_yoyo


 

Posts: 7
Joined: 9/20/2006
From: Tampa, FL, USA
Status: offline 		I am DKMILLETTE'S son and the Super 80 does not have a crush washer in it. It has a ring that has a set screw to hold the ign. cap on. All the threads in the head were fully engaged. The eng. top temp is 200 deg. within recommended temp. top RPM is 6200 RPM and swinging a Mejlik 27-10 CF with JMB Canister muffler. Just sent it in to Mike at RCS and waiting to find out what he can do for me...


(in reply to mtwister)
       Post #: 16