Help! Engine bogging around 5-k rpms

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01 Dec 2012 00:10 - 13 Jan 2013 12:32 #560727 by Patton
Replied by Patton on topic Help! Engine bogging around 5-k rpms

CafeKid wrote: ...havent been able to find the mm measurements in my service manual for the distance from the top of the floats to the side of the carb body.
Is it a pretty universal measurement for these bike or do they all differ?


The service fuel level as determined by the clear tube test is the most reliable method to assure actual fuel level being within specs.

With exactly equal service fuel levels shown by each and every carb as demonstrated by the clear tube test, it's a safe bet that the distance from the top of the floats to the side of the carb body will be slightly different in each carb, and likely none of which will match the distance as specified in the service manual.

When the tang adjustments have for whatever reason gotten totally out of whack, the measured distances with carbs upside down on the work bench should help get fuel levels back in the ball park, as a rough setting to thereafter fine tune via the clear tube test.

If able to achieve correct service fuel level in one carb (via clear tube test), could measure the distance from the top of the floats to the side of the carb body in that particular carb, and pretend that such measurement is what the service manual would provide.

Bottom line -- rely on the clear tube test, and don't be overly concerned with the supposedly correct physically measured dimensions inside the carb.

Good Fortune! :)

1973 Z1
KZ900 LTD
Last edit: 13 Jan 2013 12:32 by Patton.
The following user(s) said Thank You: CafeKid

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12 Jan 2013 17:44 #567012 by CafeKid
Replied by CafeKid on topic Help! Engine bogging around 5-k rpms
Alright so got the bike running well!:) The float bowl had been set at the wrong height and was causing it to bog! Thanks for the help everyone, especially Patton!

Gonna tinker with the timing and some brake stuff but other than that she runs great!

B)

'79 KZ400

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12 Jan 2013 18:07 - 12 Jan 2013 18:22 #567014 by 650ed
Replied by 650ed on topic Help! Engine bogging around 5-k rpms

CafeKid wrote: Alright so got the bike running well!:) The float bowl had been set at the wrong height and was causing it to bog! Thanks for the help everyone, especially Patton!

Gonna tinker with the timing and some brake stuff but other than that she runs great!

B)


If she's running great why tinker with the timing? :huh:

Attachment 00000_2013-01-12.jpg not found



:woohoo: :woohoo: :laugh:

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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Last edit: 12 Jan 2013 18:22 by 650ed.

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13 Jan 2013 02:31 #567103 by CafeKid
Replied by CafeKid on topic Help! Engine bogging around 5-k rpms
The infamous last words :laugh: but just to really perfect how she runs. I may or may not right now, but the front brake is what needs work right now. Then she'll hit the road :)

'79 KZ400

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  • donthaveakawman
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13 Jan 2013 03:57 #567106 by donthaveakawman
Replied by donthaveakawman on topic Help! Engine bogging around 5-k rpms
I would advance the ignition timing, might be the spring advance is stuck you might want to check that first.

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