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Rough Carburation
- toolman5774
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1- When disassembling the carbs, 2 of the top end gaskets had splits in them right where the screw was. Thinking that Air does not flow through here, I didn't think much of it, and would replace them when winterizing. But could this be causing a mixture issue on those 2 carbs?
2- Perhaps just spraying the jets to what I believed to be clean with gumout wasn't enough? Should total disassebly be warranted? I'm concerned here, as I have limited experience and resources when it comes to tuning and balancing. The thing had a top end and carb tune up in '98
3- I still need to replace the fuel valve, as the lever snapped from the tab that operates the nylon closing valve, however when testing, fuel seems to be flowing fine. Seeing as it runs fine at the top end, fuel should not be the issue, right?
Another post I read pointed to possible coil problems, but wouldn't that cause bad firing at any range?
I haven't pulled the plugs since the problem started (installed fresh plugs before starting), but certainly will this afternoon, and report back. Any thoughts and/or input would be much appreciated!:huh:
Doug
Second Generation Z1 Owner
1975 Z1B 900 w/ 53K miles
K&N Pods
Kerker 4-1
King/Queen LTD Seat w/ Sissy bar and luggage Rack
2009 ZG1400 (Concours non-ABS)
7k
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- anarki650
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09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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- bill_wilcox100
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As has been observed many times by members, these old gas tanks typically have fine rust and debris which is persistent and repeatedly fouls freshly cleaned carbs. It also steals away precious riding days.
Many have eliminated the symptom by adding a good quality inline fuel filter (don't ask how I learned this) and replacing it each season.
Best of success.
Bill
PS,
Please add your year, model and location to help members help you... and 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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- toadson
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79 KZ1000 LTD. Mikuni VM26 w/ accelerator pump. 4 into 1 header. Stock intake setup. GS1100 Swingarm, My swap thread: kzrider.com/index.php?option=com_kunena&...d=5&id=210872#210872
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- roy-b-boy-b
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I have been cleaning carbs for three days. Two sets. Run one set and clean the other. Finally got them clean. Really clean. Roy
1979 LTD Street Fighter.1977 KZ1000
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- toolman5774
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One more question though. I've never actually removed the jets, will they need completely retuned/balanced after, or is there a way I can mark them before removing them to put them back as is? Thanks again!
Doug
Second Generation Z1 owner
1975 Z1B 900 with 49k miles
K&N Pods
Kerker 4-1 header
Corbin King/Queen Seat
Doug
Second Generation Z1 Owner
1975 Z1B 900 w/ 53K miles
K&N Pods
Kerker 4-1
King/Queen LTD Seat w/ Sissy bar and luggage Rack
2009 ZG1400 (Concours non-ABS)
7k
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- roy-b-boy-b
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1979 LTD Street Fighter.1977 KZ1000
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- bill_wilcox100
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I have not heard of or experienced any de-tuning due to removing a jet and putting the SAME jet back into the SAME carb (with the same washer or same gasket or same O-ring)... but, time permitting, I personally would re-check all tuning to assure best performance.
On the other hand, if there was debris/stuff in the jet and the PO had done all adjustments based on the dirty/partially clogged jet then yes, I would expect to have to re-tune the carb.
Similarly, if an old and or worn jet were replaced with a new or good old jet then again yes, I would expect to have to re-tune the carb.
IMHO, Roy makes a very good point about sound gaskets. You may want to get a new set for each carb as troubleshooting this type of fault is very hard to do the logical way.
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
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- toolman5774
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Doug
Second Generation Z1 Owner
1975 Z1B 900 w/ 53K miles
K&N Pods
Kerker 4-1
King/Queen LTD Seat w/ Sissy bar and luggage Rack
2009 ZG1400 (Concours non-ABS)
7k
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- roy-b-boy-b
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You have the stock exhaust? I have seen some sets go for $3500.00.
We would like to see some pictures. Roy
1979 LTD Street Fighter.1977 KZ1000
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- toolman5774
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Here's one for you other Z1 buffs that I'm torn on:
The 75's were known for having the top of the tank fade out the maroon and show the green primer underneath from what I'm told, and mine is no exception. I can get ahold of original paint, but don't know if I really want to get it painted, or leave the "weathered" look. I definately need the side covers and tail painted, as the paint has cracked, but the tank has faded so evenly, it looks like a starburst just below the cap. I'll include some pics as soon as I get home.
Oh, and I have some pictures in my gallery for ya roy-boy. I'll surely be adding some more now that she's back in one piece.
Doug
Second Generation Z1 Owner
1975 Z1B 900 w/ 53K miles
K&N Pods
Kerker 4-1
King/Queen LTD Seat w/ Sissy bar and luggage Rack
2009 ZG1400 (Concours non-ABS)
7k
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- bountyhunter
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Only way to go. Without it, you will have endless problems as the junk drains down into the carbs.Thanks guys! I think I'm going to take all of these ideas and run with them. I had to drain the tank before working on the carbs this year, but the gas didn't really have any debris in it. Nontheless, I have thought about putting an inline filter on it anyways.
1979 KZ-750 Twin
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