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Help! KZ wont take gas.
- FortPayne750g1
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Adjusted floats to within spec.
Blew them out with carb cleaner and compressed air.
Didnt work. Same problem. Slightest throttle it dies like its running lean. So went on down the list.
Changed plugs, they showed rich but turns out they had put wrong ones on at the kaw place.
Checked coil and wires with ohm meter- it was right on spec.
Re-adjusted points as per manual.
Cleaned petcock- fresh gas.
Inspected boots for leaks, unfortunately none.
Cleaned carbs again today just to make sure. Yup they are clean.
Only things not perfect- pinhole in diaphragm repaired with tiny bead of gorrilla glue, and someone had stripped out a drain plug and replaced with larger thread screw. Same length shaft so not obstructing the airway.
Im stumped and turns out cussin it doesnt help at all.
What else could it be?
1980 KZ750 G1
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- Patton
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Here's a carb diagram from kawasaki.com for reference.
If not already done, would assure #47 main jet plug screw isn't missing.
Good Fortune!
1973 Z1
KZ900 LTD
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- FortPayne750g1
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After stumbling round a little bit came across coil power mod. Might try that tomorrow.
Thanks Patton
1980 KZ750 G1
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- KZBillx7
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- 79' KZ1000 LTD
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'79 KZ1000 LTD
'79 KZ1000 ST
'79 KZ1000 A3
'78 KZ650 B
'88 KDX200
'75 KZ650
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- Patton
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FortPayne750g1 wrote: ...Adjusted floats to within spec....
If not already done, would assure correct fuel levels by performing the clear tube test.
The mechanical float height measurement is notoriously unreliable.
Before resorting to the coil mod (which simply assures battery voltage to coils without correcting issues causing the loss of voltage between battery and coil), would visually observe spark on removed plugs, looking for fat blue spark.
If fat blue spark is present, the coil mod likely won't help much.
Would also assure proper function of the timing advancer.
Good Fortune!
1973 Z1
KZ900 LTD
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- elfmagic17
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Kenny Hicks
74 Honda CB550
75 Honda CB360 (runs and rides good but not a show bike)
77 KZ650B1 (Runs Great, but needs painted and a little work.)
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- FortPayne750g1
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New points assembly, but will check condenser 2mrw just to make sure.
Did not inspect timing advancer, might be a good idea. I assume service manual shows what to look for in a bad advancer, ill let yall know what i find.
Thanks guys!
1980 KZ750 G1
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- Motor Head
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- FIX UP YOUR BIKE RIGHT AND CHEAP
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FortPayne750g1 wrote: That doubles as float drain on this model. That is the one that was replaced with a larger thread screw on one carb.
After stumbling round a little bit came across coil power mod. Might try that tomorrow.
Thanks Patton
don't go with the "Coil Mod" as a fix. But you can of course test with something going to the coils from the battery. If you find the voltage low on the Yellow/ Red at the coils. Check also the Brown wire at your voltage Regulator/ Rectifier assy. Low here will cause charging issues, overcharging if voltage is low. The way the circuits are feed, the white wire from the Main Fuse goes in to the Ignition switch, then when on the switch powers both the coils and R/R. So check both sides of the Main Fuse Holder, wires, clips, fuse, for voltage drop.
Here is the link in "File Base" for your Diagram: www.kzrider.com/filebase/cat_view/99-198...3-kawasaki-kz-750-g1
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
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- Patton
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FortPayne750g1 wrote: ...Did not inspect timing advancer...assume service manual shows what to look for in a bad advancer....
Function is best checked with a strobe type timing light.
Visually observe advancer quickly move back and forth as rpm is varied by blipping the throttle.
Good idea to put a drop of oil on each pivot point.
Hoping the advancer doesn't look like this: :pinch:
Good Fortune!
1973 Z1
KZ900 LTD
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- FortPayne750g1
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Thanks for the great advice guys!
P.S. - you were right about skipping the coil mod. After checking my voltage im at 11.48 v. Not enough for significant coil performance drop I dont think.
1980 KZ750 G1
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- FortPayne750g1
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After waiting several hours tried out new seal on carb boot, it was a no go. So straight to the timing advancer; it looked like pic 2:ohmy:
So a can of wd40 and some steel wool later...:woohoo:
Crazy thing is kawa dealership had to look right at it when they installed the new points. Oh well, it works now and cheaper this way.
Knew yall could figure it out!
1980 KZ750 G1
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