28mm pumper carbs

Samminorwich
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01 Aug 2022 07:01 #871446 by Samminorwich

28mm pumper carbs was created by Samminorwich

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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01 Aug 2022 10:51 #871458 by hardrockminer

Replied by hardrockminer on topic 28mm pumper carbs

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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Samminorwich
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01 Aug 2022 16:55 #871478 by Samminorwich

Replied by Samminorwich on topic 28mm pumper carbs

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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01 Aug 2022 17:16 #871479 by Nessism

Replied by Nessism on topic 28mm pumper carbs

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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Samminorwich
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02 Aug 2022 00:58 #871490 by Samminorwich

Replied by Samminorwich on topic 28mm pumper carbs

It runs and starts ok
re Sammi

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hardrockminer
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02 Aug 2022 04:00 #871492 by hardrockminer

Replied by hardrockminer on topic 28mm pumper carbs

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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Samminorwich
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10 Aug 2022 02:47 #871959 by Samminorwich

Replied by Samminorwich on topic 28mm pumper carbs

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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hardrockminer
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10 Aug 2022 06:10 #871964 by hardrockminer

Replied by hardrockminer on topic 28mm pumper carbs

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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10 Aug 2022 06:17 - 10 Aug 2022 06:18 #871966 by Wookie58

Replied by Wookie58 on topic 28mm pumper carbs

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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