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28mm pumper carbs 01 Aug 2022 07:01 #871446

  • Samminorwich
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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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28mm pumper carbs 01 Aug 2022 10:51 #871458

  • hardrockminer
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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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28mm pumper carbs 01 Aug 2022 16:55 #871478

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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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28mm pumper carbs 01 Aug 2022 17:16 #871479

  • Nessism
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How does the bike run?

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28mm pumper carbs 02 Aug 2022 00:58 #871490

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It runs and starts ok 
re Sammi 

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28mm pumper carbs 02 Aug 2022 04:00 #871492

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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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28mm pumper carbs 10 Aug 2022 02:47 #871959

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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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28mm pumper carbs 10 Aug 2022 06:10 #871964

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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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28mm pumper carbs 10 Aug 2022 06:17 #871966

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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 ?

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Last edit: by Wookie58.
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