Carb wont send fuel to engine

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18 May 2011 16:34 #451940 by kk1365
Carb wont send fuel to engine was created by kk1365
So ive been battling with this bike now and still nothing. Fuel will go to the carb and fill the float bowls but fuel will not go from the float bowl to the engine. I disassembled the carb today and cleaned it all out and still nothing...any ideas?

1984 kz700

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18 May 2011 16:48 #451944 by ultimate fighter
Replied by ultimate fighter on topic Carb wont send fuel to engine
how much where the carbs apart? sounds like either float level isn't high enough or the pilot circuit is blocked

love building motorcycles one headache at a time

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18 May 2011 17:48 #451954 by kk1365
Replied by kk1365 on topic Carb wont send fuel to engine
I thought I had it all down, follwed all instructions in the manual...gunna do it again when I get home.

1984 kz700

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18 May 2011 20:32 #451974 by kk1365
Replied by kk1365 on topic Carb wont send fuel to engine
ok took it all back down and still everything looks fine/moves liquids fine but when i attach the carbs to the bike it wont send fuel. I am about to just light the damn thing on fire and write it off for insurance

1984 kz700

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18 May 2011 20:42 - 18 May 2011 20:44 #451977 by TeK9iNe
Replied by TeK9iNe on topic Carb wont send fuel to engine
When you say "moves liquids fine", do you mean that if you spray through the pilot with carb cleaner, you can see it blast finely into the carb bore? Making sure that it passes through the carbs into the bore is the ONLY way to be sure that fuel is going into the engine.

Check for really good spark.
Compression is good?
Turn the mixture screws out from seated 1.5 turns.
blow cleaner through every passage in those damn carbs, and make sure it passes into the bores.
Makae sure fuel height, float levels are correct/close to spec.

Get everything air tight - carb to engine, carb to airbox and filter installed, or it may not start!

Check that there is a gap at the bottom of the slides about a mm, 1/16th" of gap so it can actually pullin that air/fuel mix - and increase the idle a few times while trying to start it - adjust idle screw!

Use full choke and dont open the throttle. Crank the engine for a good REAL 10 seconds. LOOK at your watch!

If its got decent compression, a good closely timed spark, and some fuel squirts in there - boom, running engine - providde its happening on all four...

Good luck!

B)

Motorcycle Shop Owner/Operator

79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors ;)
Last edit: 18 May 2011 20:44 by TeK9iNe.

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18 May 2011 20:42 #451978 by 650ed
Replied by 650ed on topic Carb wont send fuel to engine
I assume when you try to start the bike you give it full choke with petcock on, or on prime, and zero throttle; true? After you crank it a bit, how are you checking that it's getting no fuel? Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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18 May 2011 21:00 #451985 by kk1365
Replied by kk1365 on topic Carb wont send fuel to engine
i can spray carb cleaner through every bore and it travels through without a problem. i have good spark, great compression, mixture screws are set. The airbox coupling things dont fit to the carb, its like the whole thing has warped and its all off by a half inch but the carbs are attached to the engine just fine.

1984 kz700

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18 May 2011 21:08 #451988 by 650ed
Replied by 650ed on topic Carb wont send fuel to engine

kk1365 wrote: i can spray carb cleaner through every bore and it travels through without a problem. i have good spark, great compression, mixture screws are set. The airbox coupling things dont fit to the carb, its like the whole thing has warped and its all off by a half inch but the carbs are attached to the engine just fine.


I don't see how this equates to your engine not getting fuel. There are other reasons it may not start or run (for example, too much fuel, ignition timing off, etc.). Have you checked the plugs to see if they're wet or dry? Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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18 May 2011 21:21 #451991 by kk1365
Replied by kk1365 on topic Carb wont send fuel to engine
timing is correct, plugs are DRY! Its obvious that im not getting fuel when i can spray fuel through the intake of the carb and it will run but when thats burned up it cuts off. There is no fuel going to the engine if i can spray fuel straight to the engine and it starts and if i do not spray fuel in the plugs are dry. I dont see how this does not equate to the engine not getting fuel and the reason it does not run...

1984 kz700

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18 May 2011 22:18 - 18 May 2011 22:25 #452002 by kz750saskatoon
Replied by kz750saskatoon on topic Carb wont send fuel to engine
Have you checked the float bowl levels? You mentioned in the first post that fuel gets into the bowls, but how much?

Edit: Check out this post: kzrider.com/forum/3-carburetor/447684-mi...atslides-help#447714 for a picture of the way to check fuel levels in float bowl.

1981 KZ750-H2
Saskatoon, SK
Last edit: 18 May 2011 22:25 by kz750saskatoon.

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19 May 2011 01:16 #452040 by kk1365
Replied by kk1365 on topic Carb wont send fuel to engine
i will try that tomorrow. I do know its about the same amount of fuel in each because when i drain them they each take around the same amount of time.

1984 kz700

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20 May 2011 21:38 #452470 by kk1365
Replied by kk1365 on topic Carb wont send fuel to engine
well i checked and the float bowl level is correct. so now im lost yet again...I took the carbs to a local shop as a last resort and they are just as stumped as i am.

1984 kz700

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