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Looking for carbs 18 Mar 2021 04:47 #845132

  • JR
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Open the throttle butterfly (engine side of carb), look in and up. Can you see anything resembling the 3 tiny holes circled in the pic below?  If so then these are pilot bypass holes and should be clear, Carb cleaner sprayed in the pilot jet should also come out here. They clog easily with dried gas residue etc 

 
1980 kz750E1, Delkevic exhaust
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Looking for carbs 18 Mar 2021 06:57 #845133

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You should get a fine spray from each hole. Safety goggles are a good idea.

JR, he has mechanical slide carbs, so there is no butterfly.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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Looking for carbs 18 Mar 2021 11:33 #845157

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There are butterflies, and 2 of those holes on left side are blocked. And there is no spray, just liquid coming out of either side.  Getting ready for work right now, will try again tonight... After i get me a full face shield! And more carb cleaner, can almost empty and don't seem to have much pressure left.
1981 KZ305A CSR
Western Kentucky

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Looking for carbs 18 Mar 2021 13:41 #845165

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I used a small pin with the tip bent at 90 degrees to poke out mine. A first  (high E) guitar string bent appropriately should also work. I finished up with a good blast from compressed air line at a  gas station.

Whatever you use be gentle.

goid luck
1980 kz750E1, Delkevic exhaust
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Looking for carbs 18 Mar 2021 14:49 #845166

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I use a welding tip cleaner. Just be careful. You don't want to enlarge the holes.
Honda makes a tool like this but it's a lot more than $10.
www.homedepot.com/p/Lincoln-Electric-Oxy...mers-KH575/100341101

A small brush set helps as well
www.harborfreight.com/airbrush-cleaning-...WEAQYCyABEgI1WPD_BwE


If you don't have an air compressor you could also use canned air to blow out to ports. Just grab a couple of cans because they can freeze up if you really use them. You can grab the other can while the frozen can warms back up.



 
81-KZ440-D2.
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Looking for carbs 18 Mar 2021 19:42 #845184

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Expect to use 1 can of cleaner per carb. I can't tell you how many times I've told myself I don't need safety glasses before the carb cleaner went straight into my eyeballs. 
1978 KZ1000-A2
kzrider.com/forum/11-projects/613296-1978-kz1000-a2-barn-find

1978 KZ400-B1

2022 Z900RS SE

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Looking for carbs 18 Mar 2021 21:44 #845190

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You can also use a guitar e string. They are really cheap. 
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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Looking for carbs 19 Mar 2021 01:45 #845191

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Will I get that fine spray even if the mixture screw is backed way out, or does it need to be in the running position?
1981 KZ305A CSR
Western Kentucky

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Looking for carbs 19 Mar 2021 06:36 #845195

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That shouldn’t matter. It would probably be better to completely remove the screws so that the threads get cleaned and so you can clean and inspect the screws. You can stick a thumb over the open hole.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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Looking for carbs 21 Mar 2021 11:23 #845312

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Nothing like a face full of carb cleaner to make your day... 
​
 

I did that once.  I sprayed it into the idle jet hole/boss and it shot out the air-inlet port and straight into my eye.  Man did that hurt.  I flushed my eye with water for about 10 minutes before it started to feel sort of ok.  Definitely something to avoid!
'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100

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Looking for carbs 21 Mar 2021 15:49 #845320

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Ok, does anyone know what the "factory setting" is for the mixture screws?
1981 KZ305A CSR
Western Kentucky

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Looking for carbs 21 Mar 2021 18:56 #845321

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Ok, does anyone know what the "factory setting" is for the mixture screws
 

According to the manual for the 82 305 the factory setting is 1 3/4 turns out.  your 81 is probably similar. I'd guess that  1.75 or 2 turns out from lightly seated is probably a good place to start.

If you need a manual you can download one here. Just click the "Articles" tab above and  check out service manuals in the drop down menu
1980 kz750E1, Delkevic exhaust
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