KZ650. Carb #3 spitting fuel out. Wont start

BlackEyeCafe
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KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 09:16

Hello KZ communityI have been having trouble starting my 1977 KZ650.

After tearing the carb down and re-leveling the floats it still won't start.

Today I noticed when trying to start that the 3rd carb from the left was spitting fuel. Can anyone help guide me to a resolution?

Thanks in advance.

Btw i searched the forum first and the first 10 results did not provide a solution

1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

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gd4now
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Denco where did you go?
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 09:32

#872388

Just where is the fuel spitting from? The overflow port/tubes or out the intake bell of the carb?

1977 KZ650 B1
Pods and Denco header

OLD KAW OWNERS SMILE ALOT

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BlackEyeCafe
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 09:34 - 17 Aug 2022 10:08

#872389

It's coming out the intake and into the air filter pods

IMG_0846.MOV

1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

IMG_0846.MOV

Last edit: 17 Aug 2022 10:08 by BlackEyeCafe.

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F64
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81-KZ440D2
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 10:18

#872390

pull the plugs.
are your plugs fouled?

81-KZ440-D2.
Louis Dudzik's GM HEI ignitor conversion installed 2015 s3.amazonaws.com/gpzweb/Ignition/GPZgmHEImod.html
Motogadget m-unit blue installed 2017.
LIC, NY

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BlackEyeCafe
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 10:38 - 17 Aug 2022 10:46

#872391

The 3rd was soaked in fuel and all had a little soot built up

1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

Last edit: 17 Aug 2022 10:46 by BlackEyeCafe.

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Mikaw
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 10:52

#872392

You can save that plug so you can test, use a propane torch and heat the ceramic and earth strap. It will take some time but eventually the ceramic will start to lighten, continue to heat till the whitest color is achieved.

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Mikaw
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 11:05

#872393

Are all the vacuum nipples installed on the carb holders. If it’s not flowing out of the overflow tube then it not likely to be float level, unless the overflow tube plugged.

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Scirocco
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 11:07

#872394

It could be stuck open float needle valve. Try knocking on bowl to free the valve.

My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode

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BlackEyeCafe
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 12:43

#872396

Thanks everyone. I’m going to try all those things. I will let you know what happens

1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

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zed1015
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 13:52

#872398

How's the valve clearances ?
If 3 is too tight it may not be seating and blowing back.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
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BlackEyeCafe
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 14:08

#872400

So I tried everything except torching the plugs because I checked for spark and all 4 plugs were working well.

Could this be a timing issue or air screw issue? I did the valves and did not touch the Dyna ignition after that, would I be better to re-adjust the timing?

1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

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BlackEyeCafe
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Re: KZ650. Carb #3 spitting fuel out. Wont start

17 Aug 2022 14:14

#872401

That is my main concern. I just went back over the math and I may have “mis-mathed” on # 3. Thankfully I kept notes and it will just mean ordering a new shim and the excitement of tearing apart the top end again…..

1977 KZ650 C
Jets - Main 115 - Pilot 17.5 - Needles - Position 3 - NGK BR7ES

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