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Engine starts and idling when choked, dies trying to rev up
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Engine starts and idling when choked, dies trying to rev up 07 Nov 2020 15:07 #838221

  • Geshka
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Hello there.
I am trying to get back to life donated to me kz 400. model 1978 I checked ignition and it seems to be OK, compression is fine as well, so here is the problem ...
Engine starts fairly easily and idling quite OK , howewer when I am trying to rev it up it dies immidiately. I beleive it is carb issue - just cannot pinpoit it.
Any help will be appreciated.
Kawasaki KZ 400 1978

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Engine starts and idling when choked, dies trying to rev up 07 Nov 2020 16:08 #838223

  • Nessism
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Yup, most likely carbs. They need to be spotless and connected to airbox and engine with airtight connections or the bike won't run right.

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Engine starts and idling when choked, dies trying to rev up 09 Nov 2020 05:40 #838275

  • ThatGPzGuy
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You probably need to thoroughly clean the carbs.
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
1981 Honda XR200 stroked in an '89 CR125 chassis
1965 Mustang
1967 Triumph GT6
1976 Bronco
"If you didn't build it, it's not really yours"

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Engine starts and idling when choked, dies trying to rev up 11 Nov 2020 12:47 #838349

  • howardhb
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Yes, remove and clean the carbs
Get a piece of metal guitar string (the type that is coiled) and pass it through all the jets and passages.
Then blast with some carb cleaner.
'81 GPz 550 D1 Click this link: www.kzrider.com/gallery/kz-550/1981-gpz550d1-9094#joomimg
'81 GPz 1100 B1 ELR "Tribute" www.kzrider.com/forum/11-projects/617040-1981-gpz1100-b1-rst
'82 Yamaha YB100 Fizzie
'79 Suzuki GT200 X5 TWO STROKE TWIN - SMOKER!

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Last edit: by howardhb.

Engine starts and idling when choked, dies trying to rev up 12 Nov 2020 11:43 #838388

  • loudhvx
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In addition to what the others said, check out the rubber diaphragms very closely, especially in the crevice where the rubber meets the slide. Pinholes will prevent the slides from raising properly.

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Last edit: by loudhvx.
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