PHBH 26 or PHBL 25 for a k2 and recommended jetting?

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R1100purist
Posts: 51
Joined: 18 Jun 2020 11:46
Location: Virginia Beach, VA
Location: Virginia Beach, VA

PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by R1100purist »

Hello all,

Has anyone put dellorto PHBH 26s or PHBL carburetors on their 31/2 and if so what jetting worked for you? I want to use the stock airbox
R1100purist
Posts: 51
Joined: 18 Jun 2020 11:46
Location: Virginia Beach, VA
Location: Virginia Beach, VA

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by R1100purist »

IMG_6431.png
IMG_6431.png (2.93 KiB) Viewed 2145 times
I found this on another thread, with the center column as the recommendation. Can anyone confirm this is correct for the PHBL 25s?
MickeyMoto
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Joined: 22 Nov 2008 17:41
Location: Even further oop North

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by MickeyMoto »

Would anybody know?

I am sure most still have standard VHBs.
R1100purist
Posts: 51
Joined: 18 Jun 2020 11:46
Location: Virginia Beach, VA
Location: Virginia Beach, VA

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by R1100purist »

My main jet threading has stripped on my vhb and the whole thing seems like it’s getting a bit fragile/worn so I am looking for a more modern replacement.
MickeyMoto
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Joined: 22 Nov 2008 17:41
Location: Even further oop North

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by MickeyMoto »

I understandnthat, but these carbs are not something I have heard being used, so you would need to try it yourself. However, if you search the forum, there have been successful attempts with using other carbs, Mikuni I think.
hendre
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Joined: 11 Aug 2007 06:51
Location: The Netherlands

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by hendre »

R1100purist wrote: 29 Apr 2023 13:28 IMG_6431.png

I found this on another thread, with the center column as the recommendation. Can anyone confirm this is correct for the PHBL 25s?
I posted this one, worked fine for me
70sbikes
Posts: 96
Joined: 13 Nov 2014 11:44
Location: Melbourne Australia

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by 70sbikes »

I used the centre column to work out the equivalent jetting for my Mikuni VM28's.
R1100purist
Posts: 51
Joined: 18 Jun 2020 11:46
Location: Virginia Beach, VA
Location: Virginia Beach, VA

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by R1100purist »

Hendre, thanks for the reply and confirmation. One thing I am not seeing on the euro carb website is the threaded intake in the PHBL 25s so I can transfer the current plastic “velocity stack” from the VHBZs…did you need to do this?

Also what needle did you end up using? The on in the middle column above? Or a different one?
R1100purist
Posts: 51
Joined: 18 Jun 2020 11:46
Location: Virginia Beach, VA
Location: Virginia Beach, VA

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by R1100purist »

70sbikes wrote: 30 Apr 2023 10:39 I used the centre column to work out the equivalent jetting for my Mikuni VM28's.
Great input, I think I saw your thread elsewhere. Mikunis we’re going to be my back up option as I would prefer to stay dellorto.
hendre
Posts: 600
Joined: 11 Aug 2007 06:51
Location: The Netherlands

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by hendre »

R1100purist wrote: 30 Apr 2023 10:39 Hendre, thanks for the reply and confirmation. One thing I am not seeing on the euro carb website is the threaded intake in the PHBL 25s so I can transfer the current plastic “velocity stack” from the VHBZs…did you need to do this?

Also what needle did you end up using? The on in the middle column above? Or a different one?
I had these on a bike i bought with these carbs, just noted the values as they worked fine on the K1. Cannot remember the velocity stack setup.
R1100purist
Posts: 51
Joined: 18 Jun 2020 11:46
Location: Virginia Beach, VA
Location: Virginia Beach, VA

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by R1100purist »

Hendre, thanks again. I should have rephrased my question, did you have any issues with the stock airbox connections?
park3164
Posts: 38
Joined: 03 Jun 2014 13:34
Location: Sydney Australia

Re: PHBH 26 or PHBL 25 for a k2 and recommended jetting?

Post by park3164 »

Hi R1100purist,
I'm a bit late joining this thread. On my '86 K2 I've got stock VHBZ25 HS carbs, running 115 main jet and 50 idle jet with a stock airbox and stock 260 CM atomiser. Mine is a US model, without the emissions restriction setup. She runs quite happily with modern fuel (Australian 95 octane) and BP7ES plugs. I don't know jetting for the other carbs you mention though.
Cheers,
Fiona (Sydney)
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