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Will not go over 4.5k rpm 12 Feb 2023 19:02 #880098

  • F64
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check your vacuum petcock hose for gas inside of it.
 
81-KZ440-D2.
Louis Dudzik's GM HEI ignitor conversion installed 2015 s3.amazonaws.com/gpzweb/Ignition/GPZgmHEImod.html
Motogadget m-unit blue installed 2017.
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Will not go over 4.5k rpm 12 Feb 2023 23:10 #880107

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Good point, a cracked diaphragm of the vaccum accutated petcock will suck a lot of fuel.
Your spark plugs look like wet and fuel fouled.
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Will not go over 4.5k rpm 13 Feb 2023 09:09 #880128

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My guess is a stuck timing advancer. 
We did remove the timing cover thingee and cleaned things up and lubed it where the manual specified.  
Seemed to spring like it should but do not think there is anything to adjust/test as there are no points.

 

Did you mention earlier that TK 26 Carbs were previously on it?



 
1982 KZ1100-A2

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Will not go over 4.5k rpm 13 Feb 2023 10:30 #880134

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Not sure if this will be of help or not, but you might want to try the 60/40 rule.  

www.motorcycleproject.com/text/the_60-40_rule.html
1977 KZ650 B1
Pods and Denco header


This is my Z

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Will not go over 4.5k rpm 13 Feb 2023 13:30 #880140

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check your vacuum petcock hose for gas inside of it.

 
Always dry.
1982 GPZ-550

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Will not go over 4.5k rpm 13 Feb 2023 13:31 #880142

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Good point, a cracked diaphragm of the vaccum accutated petcock will suck a lot of fuel.
Your spark plugs look like wet and fuel fouled.
Petcock was completely rebuilt.
1982 GPZ-550

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Will not go over 4.5k rpm 13 Feb 2023 13:34 #880143

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My guess is a stuck timing advancer. 
We did remove the timing cover thingee and cleaned things up and lubed it where the manual specified.  
Seemed to spring like it should but do not think there is anything to adjust/test as there are no points.


 

Did you mention earlier that TK 26 Carbs were previously on it?




 
TK26 carbs are stock and still on the bike, just gone through many times.
1982 GPZ-550

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Will not go over 4.5k rpm 13 Feb 2023 14:22 #880144

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We took apart the timing cover side.  Pick-up coils tested good, right in the center of the resistance range.
  
The Timing Rotor does not really line up with the "TEC" mark.  Pictures also of the Rotor seen from the mounting "notches" side.


Thank you for all of the replies!!

 
1982 GPZ-550
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Will not go over 4.5k rpm 13 Feb 2023 16:44 #880158

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A bit "left field" but given how long it's been standing have you checked nothing has built a nest in your exhaust causing a blockage !
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Will not go over 4.5k rpm 13 Feb 2023 18:25 #880161

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A bit "left field" but given how long it's been standing have you checked nothing has built a nest in your exhaust causing a blockage !
Good idea, but the exhaust is nearly a straight pipe, no critter remnants there.

Also, last time I had it running my son checked all 4 pipes at the headers and got even readings of about 370 degrees Fahrenheit.
1982 GPZ-550

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Will not go over 4.5k rpm 14 Feb 2023 10:26 #880183

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My guess is a stuck timing advancer. 
We did remove the timing cover thingee and cleaned things up and lubed it where the manual specified.  
Seemed to spring like it should but do not think there is anything to adjust/test as there are no points.



 

Did you mention earlier that TK 26 Carbs were previously on it?





 
TK26 carbs are stock and still on the bike, just gone through many times.
 

Teikei TK-26 Carburetor info:

gpzweb.s3-website-us-east-1.amazonaws.co...ge/TK26mainPage.html
1982 KZ1100-A2

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Will not go over 4.5k rpm 14 Feb 2023 13:24 #880189

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Carb have been gone through, all passages clear and all O-rings replaced.

Does the Timing Rotor position matter if the timing marks line up when we test with a strobe light?
1982 GPZ-550

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