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Old 08-03-2011, 05:56 PM
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Zanba RBK75 Carb Rebuild- On Echo Hedge Trimmer

What is the procedure for getting the high needle to back out. Something stops it and I am afraid to force it. There is a brass collar where you stick the screw driver in that probably needs to come out. When you have the carb apart there is a plastic plug above it. The carb is bogging and I know it isn't getting enough gas with the needle full CCW.

I have had the carb apart a couple times and cleaned up all the holes I could find. New kit is next but don't like not being able to clean that high needle chamber. Oh I put a new carb on off another unit and it works fine. I got two doing the same thing.
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Old 08-03-2011, 08:02 PM
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Is there a plastic limiter cap on the needle? If so, you will have to pull off the limiter cap in order to remove the needle.
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Old 08-03-2011, 09:36 PM
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Quote:
Originally Posted by dutch1 View Post
Is there a plastic limiter cap on the needle? If so, you will have to pull off the limiter cap in order to remove the needle.
No....I will take a picture. There is brass collar that is apparently lightly pressed into casting of the carb. The collar has a hole big enough to get the adjusting scrwdriver thru it. I know that I have to take the collar out but I don't know if I have to take that plastic plug out. The plastic plug is perpendicular to the needle and when I removed it from my scrap carb I can now see the needle screw threads. I don't know if it somehow limits the screw from being backed out all the way or not. I am concerned that if I take that plug out then I will have either a air or fuel leak. The plug didn't just come out I had to drill it out entirely.
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Old 08-04-2011, 11:16 PM
sharkey sharkey is offline
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Can you post a pic of this carb that your working on?
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Old 08-05-2011, 07:19 PM
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Kinda not very good at close ups...The largest hole is where there was a slug of plastic. I drilled it out. That hole goes down to the needle threads. When the needle is all the way CW there seems to be shank on the needle
that may have hit the plastic. The second bad picture kinda shows the brass collar that is pressed into the alum casting and also keeps the needle from being taken out. I will try better pictures.
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Old 08-05-2011, 07:47 PM
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MowerMedic77 MowerMedic77 is offline
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Just keep backing the screw out, it will push the brass plug out of the carb body.
I put the plug back in using a 4 mm allen screw the raised end of the plug fits into the spot
Of the screw that you would normally put the allen wrench. Then just lightly tap it back into
The carb body so it's flush like when you started.
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Old 08-05-2011, 09:40 PM
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The plug would not pop out I drilled a small hole in it and then got a hook but no luck. I used a drill bit to grind it up....it is now a pile of dust. My question is...why does a plug need to be in that hole? Will the needle come out by just screwing the needle CCW forcing the collar out, leaving the plug in? This is a scrap carb I was just using to study the situation.
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Old 08-06-2011, 10:15 AM
dboyd351 dboyd351 is offline
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Ed,
Take a look at this post and see if it helps any:
http://www.lawnsite.com/showthread.p...16#post3839216

I can't tell if he is addressing your issues, but he has got some good photos, step by step instructions and advice on using an old drill bit to press out the check valve.
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Old 08-07-2011, 12:19 PM
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Quote:
Originally Posted by dboyd351 View Post
Ed,
Take a look at this post and see if it helps any:
http://www.lawnsite.com/showthread.p...16#post3839216

I can't tell if he is addressing your issues, but he has got some good photos, step by step instructions and advice on using an old drill bit to press out the check valve.
Thanks I am making progress on the problem. That thread points out that I should have done a leak test on the carb. I don't know how to do that so well take it to dealer.
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Old 08-07-2011, 05:06 PM
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Well I put a new carb kit in and I backed out that high needle and cleaned that jet hole. Put it back together and the results are the same. The unit bogs and fails to go to high speed. A second unit with same carb and same age ran fine after I got the plastic plugs out on both the high and low jet and adjusted them a small amount. So since I got a new unit with a new carb same model I am going to replace parts one by one until I find out what the problem is. I am coming to the conclusion that I don't think I will buy any more units with that zamba model carb.
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