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gas "breathing" out of air tube...
- kz.chris
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29 Jun 2010 18:12 - 29 Jun 2010 19:59 #379064
by kz.chris
1977 Kawasaki KZ650
gas "breathing" out of air tube... was created by kz.chris
Its a 1977 kz650.
I'm guessing its a stuck jet but I'm not sure.
Any ideas?
I'm guessing its a stuck jet but I'm not sure.
Any ideas?
1977 Kawasaki KZ650
Last edit: 29 Jun 2010 19:59 by kz.chris.
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- Patton
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- KZr Legend
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29 Jun 2010 22:57 #379153
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic gas "breathing" out of air tube...
1973 Z1
KZ900 LTD
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- radon220
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30 Jun 2010 10:19 #379220
by radon220
Don in CT
81 KZ440-D2 belt drive
Replied by radon220 on topic gas
Do you mean you've got fuel coming out your PCV breather tube? Can you tell whether one of the cylinders isn't firing? If a float is stuck, you could be pouring so much fuel into the cylinder that it's coming out the PCV. (If so, better change the oil!)
I'm a 2cyl guy, but would make sense that a stuck float in one of the vented float chambers could drip gas out the vent tube too.
I'm a 2cyl guy, but would make sense that a stuck float in one of the vented float chambers could drip gas out the vent tube too.
Don in CT
81 KZ440-D2 belt drive
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- kz.chris
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30 Jun 2010 12:06 #379235
by kz.chris
1977 Kawasaki KZ650
Replied by kz.chris on topic gas "breathing" out of air tube...
Im not sure what the tube is called. There are 4 of them (black) that hang down from each carb.
When I say "breathing" its as if the carb dumps fuel, refills, then dumps it again, in other words its not just a solid stream of gas leaking out.
A stuck float sounds probable.
How do I disconnect the fuel tank from the carbs with out draining it?
I think I would like to drain the carbs and let some gum out sit in them for a couple days... A quick fix until fall when a full carb rebuild wont get in the way of riding
When I say "breathing" its as if the carb dumps fuel, refills, then dumps it again, in other words its not just a solid stream of gas leaking out.
A stuck float sounds probable.
How do I disconnect the fuel tank from the carbs with out draining it?
I think I would like to drain the carbs and let some gum out sit in them for a couple days... A quick fix until fall when a full carb rebuild wont get in the way of riding
1977 Kawasaki KZ650
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- bill_wilcox100
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30 Jun 2010 12:58 - 30 Jun 2010 13:03 #379243
by bill_wilcox100
1977 KZ650-B1 (Stock)
Upgrades:
- Dyna S Electronic Ignition (DS2-2)
- Dyna 3 Ohm Coils (DC1-1)
- Coil Repowering Mod
- Progressive Springs Front & Rear
- Saddlemen Seat Cover
- New Metallic Red Re-Paint & Repro Badges.
Montreal, Canada
Replied by bill_wilcox100 on topic gas "breathing" out of air tube...
From your description, it sounds as if the Float Bowl's Needle Valve is sticking open then slowly closing while the Float Bowl overflows.
What's causing this cycle or pumping? Three guesses here:
1a - A sticking Needle Valve. Be prepared to remove the Needle Valve assembly and clean or replace the assembly. Estimated cost about $20.00 for Needle Valve assembly.
1b - Also, rinse out your tank, clean out your Petcock's Fuel Screen, add fresh gas and add a clear inline Fuel Filter between your Petcock and Carb's Fuel input connection.
2 - A partially flooded float in the corresponding carb. Be prepared to repair or replace the Float. Caution the Float pin is probably frozen in. Do not try to tap out the pin as this WILL cost you a new carb.
3 - A long shot... stuff from your Fuel Tank getting stuck in your Needle Valve. See 1b above.
This is your carb:
Best of success,
Bill
PS
Please add your year, model number and location for the best responses... and yes, it's considered real friendly too.
Bill
What's causing this cycle or pumping? Three guesses here:
1a - A sticking Needle Valve. Be prepared to remove the Needle Valve assembly and clean or replace the assembly. Estimated cost about $20.00 for Needle Valve assembly.
1b - Also, rinse out your tank, clean out your Petcock's Fuel Screen, add fresh gas and add a clear inline Fuel Filter between your Petcock and Carb's Fuel input connection.
2 - A partially flooded float in the corresponding carb. Be prepared to repair or replace the Float. Caution the Float pin is probably frozen in. Do not try to tap out the pin as this WILL cost you a new carb.
3 - A long shot... stuff from your Fuel Tank getting stuck in your Needle Valve. See 1b above.
This is your carb:
Best of success,
Bill
PS
Please add your year, model number and location for the best responses... and yes, it's considered real friendly too.
Bill
1977 KZ650-B1 (Stock)
Upgrades:
- Dyna S Electronic Ignition (DS2-2)
- Dyna 3 Ohm Coils (DC1-1)
- Coil Repowering Mod
- Progressive Springs Front & Rear
- Saddlemen Seat Cover
- New Metallic Red Re-Paint & Repro Badges.
Montreal, Canada
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Last edit: 30 Jun 2010 13:03 by bill_wilcox100.
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- bill_wilcox100
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30 Jun 2010 13:00 - 30 Jun 2010 13:01 #379244
by bill_wilcox100
1977 KZ650-B1 (Stock)
Upgrades:
- Dyna S Electronic Ignition (DS2-2)
- Dyna 3 Ohm Coils (DC1-1)
- Coil Repowering Mod
- Progressive Springs Front & Rear
- Saddlemen Seat Cover
- New Metallic Red Re-Paint & Repro Badges.
Montreal, Canada
Replied by bill_wilcox100 on topic gas "breathing" out of air tube...
BTW, you will want to do the Fuel Service Level adjustment too. See following.
Best of success,
Bill
Best of success,
Bill
1977 KZ650-B1 (Stock)
Upgrades:
- Dyna S Electronic Ignition (DS2-2)
- Dyna 3 Ohm Coils (DC1-1)
- Coil Repowering Mod
- Progressive Springs Front & Rear
- Saddlemen Seat Cover
- New Metallic Red Re-Paint & Repro Badges.
Montreal, Canada
Attachments:
Last edit: 30 Jun 2010 13:01 by bill_wilcox100.
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- radon220
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01 Jul 2010 05:55 #379429
by radon220
Don in CT
81 KZ440-D2 belt drive
Replied by radon220 on topic gas
Not to hijack this thread, Bill, but can the float be tested? I'm having similar problems... I'm going to try replacing the float valve needle, but it looks and feels good to me. Carbs & gas are clean and free of debris. The floats... well... float. They, too, look good. But unfortunately I can't actually see them in operation. (I feel like a clear plastic float bowl cover would be easy to make with today's 3D imaging & printing devices and would market well!)
While bench testing the float level (carb fully assembled) the level settles right within spec. But give it another 10 minutes and the level creeps up and it overflows. I find that on the bike, the level creeps up faster than it burns off when running.
Don in CT
81 KZ440-D2
While bench testing the float level (carb fully assembled) the level settles right within spec. But give it another 10 minutes and the level creeps up and it overflows. I find that on the bike, the level creeps up faster than it burns off when running.
Don in CT
81 KZ440-D2
Don in CT
81 KZ440-D2 belt drive
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- radon220
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01 Jul 2010 06:07 #379430
by radon220
kz.chris, in case you didn't figure it out from the other posts, these are the float bowl drain hoses, which is also where you check your float level (assuming your carbs are similar to mine). As a couple of the images above illustrate, those hoses will spill gas if the float bowls overflow. If you open the drain screw with a clear hose attached (held upright close to the carb body), you can check the float level.
Don in CT
81 KZ440-D2
Don in CT
81 KZ440-D2 belt drive
Replied by radon220 on topic gas "breathing" out of air tube...
Im not sure what the tube is called. There are 4 of them (black) that hang down from each carb.
kz.chris, in case you didn't figure it out from the other posts, these are the float bowl drain hoses, which is also where you check your float level (assuming your carbs are similar to mine). As a couple of the images above illustrate, those hoses will spill gas if the float bowls overflow. If you open the drain screw with a clear hose attached (held upright close to the carb body), you can check the float level.
Don in CT
81 KZ440-D2
Don in CT
81 KZ440-D2 belt drive
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- bill_wilcox100
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01 Jul 2010 10:37 - 01 Jul 2010 10:49 #379460
by bill_wilcox100
1977 KZ650-B1 (Stock)
Upgrades:
- Dyna S Electronic Ignition (DS2-2)
- Dyna 3 Ohm Coils (DC1-1)
- Coil Repowering Mod
- Progressive Springs Front & Rear
- Saddlemen Seat Cover
- New Metallic Red Re-Paint & Repro Badges.
Montreal, Canada
Replied by bill_wilcox100 on topic gas
IMHO, Once you replace your Needle Valve assembly and add a good quality inline Fuel Filter then your clear plastic hose is as close to a clear plastic Float Bowl as is practical... but a clear Float Bowl is a really cool ideas.
If the Float is flooded you should hear the fuel inside when you shake it next to your ear... at least that`s what I could do went they were still a soldered brass assembly... way back in the brass-age. :lol: :lol: :lol:
PS
radon220 wrote:
Just a note here. I don't know anything about the KZ440's... but on the KZ650-B1 the 4 Black Hoses are "Overflow Hoses" only and are NOT used to do the Fuel Service Level adjustment. :dry:
On the other hand, the brass Float Bowl "Drain Plug" must be removed and replaced by a homemade adapter with a clear plastic hose or the Kawasaki Tool, as in the diagram, in order to do the Fuel Service Level adjustment.
Again, I have no experience with the KZ440's so no comment from me on that model.
Best of success,
Bill
If the Float is flooded you should hear the fuel inside when you shake it next to your ear... at least that`s what I could do went they were still a soldered brass assembly... way back in the brass-age. :lol: :lol: :lol:
PS
radon220 wrote:
I’m not sure what the tube is called. There are 4 of them (black) that hang down from each carb.
kz.chris, in case you didn't figure it out from the other posts, these are the float bowl drain hoses, which is also where you check your float level (assuming your carbs are similar to mine). As a couple of the images above illustrate, those hoses will spill gas if the float bowls overflow. If you open the drain screw with a clear hose attached (held upright close to the carb body), you can check the float level.
Don in CT
81 KZ440-D2
Just a note here. I don't know anything about the KZ440's... but on the KZ650-B1 the 4 Black Hoses are "Overflow Hoses" only and are NOT used to do the Fuel Service Level adjustment. :dry:
On the other hand, the brass Float Bowl "Drain Plug" must be removed and replaced by a homemade adapter with a clear plastic hose or the Kawasaki Tool, as in the diagram, in order to do the Fuel Service Level adjustment.
Again, I have no experience with the KZ440's so no comment from me on that model.
Best of success,
Bill
1977 KZ650-B1 (Stock)
Upgrades:
- Dyna S Electronic Ignition (DS2-2)
- Dyna 3 Ohm Coils (DC1-1)
- Coil Repowering Mod
- Progressive Springs Front & Rear
- Saddlemen Seat Cover
- New Metallic Red Re-Paint & Repro Badges.
Montreal, Canada
Last edit: 01 Jul 2010 10:49 by bill_wilcox100.
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