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Simple fuel screw question
- Davestradamus
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Cheers
David
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- dman3998
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Dman
Dman
SE Idaho
"Smart only goes just so far, STUPID is UN-limited"
79 KZ1000 LTD
Honda XRL650L
Yamaha RD350B
Yamaha DT400B
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- RonKZ650
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321,000 miles on KZ's that I can remember. Not going to see any more.
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- Davestradamus
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- 650ed
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Some, but not all of them. I bought my bike new, build date is January 1977, and it has the "pilot air adjusting screws" (part #16014-1004) on top by the intakes. These are the only carbs shown in the January 31, 1977 KZ650C1 Exclusive Parts List.
The earlier KZ650-B1 Kawasaki Parts Catalog (June 25, 1976) shows the "pilot adjusting screw" part #16014-018 along with a "limitter cap" part #16012-022 on the bottom of the carb just as you describe.
In the September 30, 1977 Kawasaki KZ650C Motorcycle Parts Catalog that covers C1 and C2 models both carb types are shown. According to this catalog, the (top) air screw type (like mine) was used on frame #16509 to 027500 and on C2 models, and it shows the (bottom) pilot adjusting screws on frame #1 to 016508. However, the guy writing the catalog got it wrong because my bike's frame number is less than 02000 so according to the catalog it would have the bottom type (but it came with the top type). Clearly this catalog is wrong , not only because it is wrong about the carbs on my earlier frame number, but also becasue the parts were already listed and being used when the January Catalog was published (which is when my bike was built).
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Davestradamus
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- Patton
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Turn side-located pilot air screw IN (clockwise) to enrichen pilot mixture, or OUT (counter-clockwise) to lean pilot mixture.
The pointed tip on the screw interacts with an orifice in the pilot air passage to regulate amount of air allowed to the pilot jet.
Good Luck!
1973 Z1
KZ900 LTD
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- Davestradamus
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Cheers mates!
David
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- Cychotic
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- No sir, I don't like it.
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Be sure to check both #'s. You may be surprised to find you have a different year motor with your frame. I know I was. When I checked my #'s I realized I had a '78 C2 motor in my '77 C1.
1977 KZ650 C1 with '78 C2 motor,
* OEM electronic ignition off '80 KZ750
* 4-into-1 header
* Uni Pod Filters
* #110 main jets, 17.5 pilot jets
1983 Honda V65 Magna stock...sold
1985 Kawasaki Ninja 600R project..sold
1997 Yamaha FZR600...latest toy
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- Patton
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...cold starts just fine. 1/4 turn? ... Screws are set at 1 1/2 from lightly seated....
Would go in 1/8 turn steps counter-clockwise to lean the pilot circuit. Usually, the optimal setting is where best low idle performance is determined.
Leaning the pilot circuit should not degrade cold starting ability, because cold starting mostly depends on the separate enrichener (choke) circuit.
Good Luck!
1973 Z1
KZ900 LTD
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- sabell
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'78 KZ1000A2
'79 650SR
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- Patton
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If air screws are to lean can it cause popping/backfire on decel?
Yes.
Good Luck!
1973 Z1
KZ900 LTD
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