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76 KZ 750 B Twin issues 04 Jul 2021 12:59 #851256

  • Shade2k76
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brand new battery (had about 4 days) had it on the tender last night. 
bike off, 12.8
bike on, 12.6
ignition, 12.3
 

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76 KZ 750 B Twin issues 04 Jul 2021 13:05 #851257

  • Mikaw
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brand new battery (had about 4 days) had it on the tender last night. 
bike off, 12.8
bike on, 12.6
ignition, 12.3

 

Good. Trying to rule out items.

Have you tested voltage at the coil primary. Most bikes it a red/yellow. Not sure on yours. It needs to be close to battery voltage. 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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76 KZ 750 B Twin issues 04 Jul 2021 13:07 #851259

  • Shade2k76
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coil is good.  (just replaced a bad coil, and then bad plug boot due to ohms not reading right.
voltage through the coils reading on spec as well.

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76 KZ 750 B Twin issues 04 Jul 2021 13:22 #851262

  • Mikaw
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Great. General things to check.
  1. plug condition? ​​​​​​
  2. when it’s running any blue smoke? Oil burning?
  3. Fuel filter clean and gravity type?
  4. fresh fuel?
  5. Engine and battery have good clean ground?
  6. float levels in the carbs set?
  7. carb holder boots soft, no cracks and hose clamps tight?
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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76 KZ 750 B Twin issues 04 Jul 2021 13:26 #851263

  • Shade2k76
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plug condition is new 
black smoke when choking out, at 3.5k rpm
filers are clean (added inline when first started build), yes,  gravity fed.
fresh fuel Premium
good clean ground
one is kind of stiff, but still flexable, second soft,  no holes or cacks, clamps tight and secure.

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76 KZ 750 B Twin issues 04 Jul 2021 13:38 #851264

  • Mikaw
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Please describe how it or it does not run at 3.5k. You mentioned black smoke when it “choking out” at 3.5k. That’s an indication of overly rich. 

EDIT, is it possible vibration is causing the choke lever to move to the on position?
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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76 KZ 750 B Twin issues 04 Jul 2021 13:55 #851265

  • TexasKZ
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Is it possible that the main jets ( #45 in the crappy quality diagram) are missing?

www.partzilla.com/catalog/kawasaki/motor...etors-kz750-b1-b2-b3
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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76 KZ 750 B Twin issues 04 Jul 2021 14:07 #851267

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Is it possible that the main jets ( #45 in the crappy quality diagram) are missing?

www.partzilla.com/catalog/kawasaki/motor...etors-kz750-b1-b2-b3

I will indeed have to check, but I am pretty sure they are present and accounted for.

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76 KZ 750 B Twin issues 04 Jul 2021 14:08 #851268

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Please describe how it or it does not run at 3.5k. You mentioned black smoke when it “choking out” at 3.5k. That’s an indication of overly rich. 

EDIT, is it possible vibration is causing the choke lever to move to the on position?

will try to get a video in a few minutes.  The choke is not moving back up to On.  

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76 KZ 750 B Twin issues 04 Jul 2021 14:17 #851269

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Please describe how it or it does not run at 3.5k. You mentioned black smoke when it “choking out” at 3.5k. That’s an indication of overly rich. 

EDIT, is it possible vibration is causing the choke lever to move to the on position?

will try to get a video in a few minutes.  The choke is not moving back up to On.  

It is not THICK black smoke,  can almost see in video, but can hear what happens when I go on the throttle...
art-innovate.com/bike/video-2.mp4
 

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76 KZ 750 B Twin issues 04 Jul 2021 14:38 #851271

  • Mikaw
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I think you re-posted a previous video. It’s on of the points and appears to be at idle.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Last edit: by Mikaw.

76 KZ 750 B Twin issues 04 Jul 2021 14:39 #851272

  • Shade2k76
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I do apologize for that....
try this one...   art-innovate.com/bike/video-3.mp4
 

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