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Reinstallation adjust which first, sync or pilot?
- drumstyx
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24 Apr 2015 06:11 #669390
by drumstyx
1984 KZ750L (L4)
Reinstallation adjust which first, sync or pilot? was created by drumstyx
Bike: '84 KZ750L (same as '83)
Just finished putting the carbs back in, after pulling them and cleaning jets/bowls etc, installing an in-line fuel filter, and getting valve shims.
Now, correct me if I'm wrong, but a rich mix will die when I go from no choke to half choke (after about 10-20 seconds of running), correct? This is an enrichment circuit 'choke', not a true choke, but I'm assuming the troubleshooting for rich/lean is the same...
Anyway, which do I adjust first? Sync, or the pilot screws?
Also, with adjusting the pilot screws, will adjusting actually make a significant difference in idle? With 4 cylinders maintaining momentum, I can see it being hard to tune the pilots...
Just finished putting the carbs back in, after pulling them and cleaning jets/bowls etc, installing an in-line fuel filter, and getting valve shims.
Now, correct me if I'm wrong, but a rich mix will die when I go from no choke to half choke (after about 10-20 seconds of running), correct? This is an enrichment circuit 'choke', not a true choke, but I'm assuming the troubleshooting for rich/lean is the same...
Anyway, which do I adjust first? Sync, or the pilot screws?
Also, with adjusting the pilot screws, will adjusting actually make a significant difference in idle? With 4 cylinders maintaining momentum, I can see it being hard to tune the pilots...
1984 KZ750L (L4)
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- SWest
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24 Apr 2015 06:31 #669392
by SWest
Replied by SWest on topic Reinstallation adjust which first, sync or pilot?
Get a manual. Bench sync the carbs per the manual. Adjust the pilots 1-1/4 out. If it won't run without the choke, lean condition or clogged pilots.
Steve
Steve
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- KZQ
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24 Apr 2015 06:42 #669393
by KZQ
www.KZ1300.com
Riders:
1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 2000 Valkyrie, 2009 Yamaha Roadliner S. 1983 GL 1100
Projects:
1985 ZN1300
Replied by KZQ on topic Reinstallation adjust which first, sync or pilot?
Hi drumstyx,
Probably too many overlapping questions to answer all at once.
Before you start tweaking the carbs it's important to go ahead and adjust the valves if they need adjustment.
Typically the pilot screw adjustment is performed before the sync adjustment.
Your question about a rich mixture may resolve itself once you get closer to proper tune.
Hope this helps.
Bill
Probably too many overlapping questions to answer all at once.
Before you start tweaking the carbs it's important to go ahead and adjust the valves if they need adjustment.
Typically the pilot screw adjustment is performed before the sync adjustment.
Your question about a rich mixture may resolve itself once you get closer to proper tune.
Hope this helps.
Bill
www.KZ1300.com
Riders:
1968 BSA 441 Shooting Star, 1970 BSA 650 Lightning, 1974 W3, 1976 KZ900, 1979 KZ750 Twin, 1979 KZ750 Twin Trike, 1981 KZ1300, 1982 KZ1100 Spectre, 2000 Valkyrie, 2009 Yamaha Roadliner S. 1983 GL 1100
Projects:
1985 ZN1300
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- drumstyx
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24 Apr 2015 07:59 #669398
by drumstyx
1984 KZ750L (L4)
Replied by drumstyx on topic Reinstallation adjust which first, sync or pilot?
I guess I was a bit scatterbrained at first there.
I have the manual, and it doesn't really describe the order of things.
I didn't separate the carbs, so sync will be at least as good as it was before (and the butterflies did appear to be equal on the bench).
Valves were just done. I was waiting for valve shims to come in before putting everything back together, but everything looks good now.
Rich mixture is easily a problem with the pilots. The manual says 2 turns out, but I seem to recall some were between 1 and 1 1/2 turns out when I pulled them out.
All I really needed to know was which came first, and I guess pilot can come first in this case, since it's obviously running too rich. I can always go back after syncing to make sure it's all good.
I have the manual, and it doesn't really describe the order of things.
I didn't separate the carbs, so sync will be at least as good as it was before (and the butterflies did appear to be equal on the bench).
Valves were just done. I was waiting for valve shims to come in before putting everything back together, but everything looks good now.
Rich mixture is easily a problem with the pilots. The manual says 2 turns out, but I seem to recall some were between 1 and 1 1/2 turns out when I pulled them out.
All I really needed to know was which came first, and I guess pilot can come first in this case, since it's obviously running too rich. I can always go back after syncing to make sure it's all good.
1984 KZ750L (L4)
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24 Apr 2015 08:06 #669399
by SWest
Replied by SWest on topic Reinstallation adjust which first, sync or pilot?
You will adjust the pilots before syncing and after to fine tune it. It is helpful to run it at about 1/8-1/4 throttle and listen to the exhaust while adjusting the screws. If everything is OK and there is still a lean miss or rich one, you can take it out with the screws. If you can't, there is still a problem.
Steve
Steve
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24 Apr 2015 09:38 #669412
by SWest
Replied by SWest on topic Reinstallation adjust which first, sync or pilot?
You can go to Mikuni USA and they have all the information you need. They say to adjust the sdrews 1/4 turn at a time, waiting ten seconds between for the carb to "catch up".
Steve
Steve
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