- Posts: 167
- Thank you received: 9
Header double walls
- DGA
- Topic Author
- Offline
- User
"83 KZ1100 Spectre, '81 Yamaha XV750 Cafe, '74 Kawasaki H2B 750
Please Log in or Create an account to join the conversation.
- Tyrell Corp
- Offline
- User
- "You were made as well as we could make you"
- Posts: 1650
- Thank you received: 261
Swap your 2 and 3 plug leads and see if the problems transfers...if not, eliminate ignition...for now
Then think likely pilot jet blocked or pilot airscrew issues, a 4 cylinder masks this unlike a single, also with a stupidly powerful 1100 bike, 1/8 -1/4 throttle issues on one pot are much less noticeable. If cleaning the carbs doesn't sort this then maybe get the vacuum gauges and compression tester out for further diagnostics later.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
Please Log in or Create an account to join the conversation.
- DGA
- Topic Author
- Offline
- User
- Posts: 167
- Thank you received: 9
"83 KZ1100 Spectre, '81 Yamaha XV750 Cafe, '74 Kawasaki H2B 750
Please Log in or Create an account to join the conversation.
- Tyrell Corp
- Offline
- User
- "You were made as well as we could make you"
- Posts: 1650
- Thank you received: 261
Bench synch is a rough starting guide, but in the real world there will be a difference, hence the balance guages.
What is it like on a run when fully hot? What are the valve clearances?
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
Please Log in or Create an account to join the conversation.
- DGA
- Topic Author
- Offline
- User
- Posts: 167
- Thank you received: 9
"83 KZ1100 Spectre, '81 Yamaha XV750 Cafe, '74 Kawasaki H2B 750
Please Log in or Create an account to join the conversation.
- Nessism
- Offline
- Sustaining Member
- Posts: 7507
- Thank you received: 2824
Good luck
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
Perform the clear tube test on carb #3 to assure that the fuel level isn't too high, which could produce an excessively rich mixture from an otherwise clean and perfectly adjusted carb, resulting in failure of combustion;
Assure that valve clearances are correct for #3 cylinder, as a too tight valve may fail to seal at normal operating temperature, resulting in loss of compression and failure of combustion.
A standard compression test or leak-down test is not enough. Even if the numbers are okay, it could be that a too tight valve at cooler temp is sealing when closed, but won't seal at normal operating temp.
Good Fortune!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- DGA
- Topic Author
- Offline
- User
- Posts: 167
- Thank you received: 9
Note my original statement, that #3 pipe has a cleaner appearance than the other three, that have small rust pits, this is not a new problem I have introduced due to something, I did, it WAS running like this before I got it, when it DID run last.
"83 KZ1100 Spectre, '81 Yamaha XV750 Cafe, '74 Kawasaki H2B 750
Please Log in or Create an account to join the conversation.
- 650ed
- Offline
- User
- Posts: 15344
- Thank you received: 2829
DGA wrote: ..... I set the float levels very accurately when I rebuilt the carbs, measured their heights.....
If you used the clear tube method to adjust the FUEL levels of the carbs; skip the rest of this reply.
If you did not use the clear tube method the FUEL levels may not all be the same. Setting the FLOAT levels by using a rule on the floats ensures the float levels are the same when dry, but it doesn't ensure the FUEL levels will all be equal when the carbs are mounted and full of fuel. One reason this is true is the fact that the buoyancy of the individual floats can vary, and that will affect the fuel levels in the carbs. The clear tube test shows the actual fuel levels regardless of any variance between the individual floats.
I'm not insisting this is causing the problem you are experiencing, but it is one more variable that should be eliminated. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Please Log in or Create an account to join the conversation.
- Patton
- Offline
- KZr Legend
- Posts: 18640
- Thank you received: 2098
Good Fortune!
1973 Z1
KZ900 LTD
Please Log in or Create an account to join the conversation.
- DGA
- Topic Author
- Offline
- User
- Posts: 167
- Thank you received: 9
"83 KZ1100 Spectre, '81 Yamaha XV750 Cafe, '74 Kawasaki H2B 750
Please Log in or Create an account to join the conversation.
- 650ed
- Offline
- User
- Posts: 15344
- Thank you received: 2829
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Please Log in or Create an account to join the conversation.