C3 mis-fire

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22 Apr 2020 10:18 #823933 by Superbike33
C3 mis-fire was created by Superbike33
Can anyone help ? I have a 1979 z650 c3 , us import , it has had replacement Uk carbs fitted ,cleaned and set up , new points ,condensers,coils . My issue is that it struggles to get past 85 mph , it runs really sweet up to there but starts holding back at about 75-80mph . I’ve had around 6 previous z650,s but never experienced this issue , has anyone else had similar issues or any ideas what the problem might be ? Grateful for any help

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  • gd4now
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  • Denco where did you go?
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22 Apr 2020 10:41 #823941 by gd4now
Replied by gd4now on topic C3 mis-fire
Could use some more info. You running stock exhaust and air box? What type of UK carbs are you running, vm24ss or something else? What size main jet are you running?
1977 KZ650 B1
Pods and Denco header

OLD KAW OWNERS SMILE ALOT

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22 Apr 2020 10:48 #823942 by Superbike33
Replied by Superbike33 on topic C3 mis-fire
Hi thanks for your reply , I’m running standard pipes and air box , new filter , not sure what jets are in tho , kept the ones which came with the carbs ?? Standard Mikuni carbs from what I can tell . Came off a B1 possibly ??

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22 Apr 2020 16:38 #823992 by TexasKZ
Replied by TexasKZ on topic C3 mis-fire
Could the ignition advancer be stuck?
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
The following user(s) said Thank You: Superbike33

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