28mm pumper carbs

  • Samminorwich
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28mm pumper carbs

01 Aug 2022 07:01
#871446
Hi just got my bike running for the first time, I have an idle and it doesn't bog down when revved up but here's the thing the air screws are fully screwed in to achieve this 
please can anyone suggest a way I can get the balance out to 1 1/2 turns like standardRe Sammi 

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  • hardrockminer
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Re: 28mm pumper carbs

01 Aug 2022 10:51
#871458
First, are the carbs all clean and ready to function?  Second, do they have stock jets and needles?  If so, then do a proper mechanical synch as per the manual.  
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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Re: 28mm pumper carbs

01 Aug 2022 16:55
#871478
Hi thanks for reply, the carbs fully function and we're cleaned professionally by an engineer, in the UK pumper carbs are unusual
should I replace the pilot jets to a larger size or the jet on the needle 

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  • Nessism
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Re: 28mm pumper carbs

01 Aug 2022 17:16
#871479
How does the bike run?
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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Re: 28mm pumper carbs

02 Aug 2022 00:58
#871490
It runs and starts ok 
re Sammi 

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  • hardrockminer
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Re: 28mm pumper carbs

02 Aug 2022 04:00
#871492
What bike are you running?  Have you done a vacuum synchronization?  What jets are currently installed?  Pilot, main, needle jet and jet needle.  What position setting are the needles?  Are your choke plungers rebuilt or are they original?
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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Re: 28mm pumper carbs

10 Aug 2022 02:47
#871959
Running pumper 28mm standard airbox filter and four into four baffled , I guess I should start by increasing pilot jet size as the air screw is screwed right in to get an idle, I think I should go up 5 then see how it runs under load 

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Re: 28mm pumper carbs

10 Aug 2022 06:10
#871964
With the air screw all the way in you are reducing air flow, which means you are getting a richer than normal mixture.  I would not go up 5.  Maybe go up one size.  What are you running now?  If 15 then try 17.5.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.

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  • Wookie58
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Re: 28mm pumper carbs

10 Aug 2022 06:17 - 10 Aug 2022 06:18
#871966
wrote:
With the air screw all the way in you are reducing air flow, which means you are getting a richer than normal mixture.  I would not go up 5.  Maybe go up one size.  What are you running now?  If 15 then try 17.5.


 
Only a suggestion but shouldn't the focus be where it is getting unmetered air from if it will only idle with the air screws fully in ?
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
Last edit: 10 Aug 2022 06:18 by Wookie58.

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