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1967 BSA B44 PWK Settings #606682
06/30/15 9:57 am
06/30/15 9:57 am
Joined: Jan 2012
Posts: 28
Indianapolis, USA
F
Fermatseye Offline OP
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Fermatseye  Offline OP
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Joined: Jan 2012
Posts: 28
Indianapolis, USA
I am ready to start a newly rebuilt B44 and have installed a JRC PWK carb.
Engine is mostly stock with stock replacement exhaust and Boyer ignition, +0.40 piston.
Any suggestions for baseline carb settings, needle, jets, mixture screw?
Any input would be appreciated. This bike has been a 6 year project so you can imagine I am excited to hear this baby run.
While I'm at it, any other advice for start up?

Last edited by Fermatseye; 06/30/15 12:01 pm.

1967 B44E
1961 A10 Super Rocket
1947 B33 Project
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Re: 1967 BSA B44 PWK Settings [Re: Fermatseye] #606840
07/01/15 8:37 am
07/01/15 8:37 am
Joined: Oct 2013
Posts: 9
Iowa
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rw513 Offline
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Iowa
This wont relate directly, but thought I'd share anyway, I just finished a 70 B25 with the same carb. I ended up at 105 main, 30 pilot, needle at 1 clip from leanest, air screw 1 turn out. I would imagine you would want to start somewhere on the rich side of that.

Re: 1967 BSA B44 PWK Settings [Re: Fermatseye] #607096
07/02/15 5:45 pm
07/02/15 5:45 pm
Joined: Sep 2004
Posts: 693
Farnham, Surrey, UK
gunner Offline
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gunner  Offline
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Posts: 693
Farnham, Surrey, UK
Im using a JRC PWK carb on my 1968 B44, the jetting is as follows:-

- main jet 130
- pilot jet 30
- needle clip position middle
- needle type JJM (straight section diameter 2.475, see http://www.allensperformance.com/data-n427-46.html)
- air screw 1 1/2 turns out

When I originally installed the carb I found it was running rich. I eventually found that the needle was too narrow and fitted a JJM needle which has a thicker straight section and allows less fuel to bleed past the jet.

As received the JRC PWK didnt have any markings on the jets, so I swapped the jets for genuine Keihin PWK 28 jets which are readily available.

The JRC PWK carb is actually a clone of the Keihin PWK carb. What JRC engineering have done is to add a flange to allow the carb to be mounted on british bikes.

Im very happy with my JRC PWK carb and it does have some advantages over an AMAL Concentric, such as a chromed flatside, a pullup choke enrichment device and a solid mounting flange which wont distort. Starting hot or cold is easy and performance is excellent.

The down side is that you may need to fiddle with the jetting. If your jets dont have any markings then I would replace them for genuine Keihin PWK jets. There are some good guides on tuning Keihin PWK carbs such as this one http://www.keihin-na.com/assets/1/7/slide_valve.pdf


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: 1967 BSA B44 PWK Settings [Re: gunner] #607823
07/08/15 10:05 pm
07/08/15 10:05 pm
Joined: Jan 2012
Posts: 28
Indianapolis, USA
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Fermatseye Offline OP
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Fermatseye  Offline OP
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Joined: Jan 2012
Posts: 28
Indianapolis, USA
Hey thanks alot Gunner I was begining to think I was the only one who bought one of these grin
Won't get any time this weekend to try it out but that will give me time to order jets etc.


1967 B44E
1961 A10 Super Rocket
1947 B33 Project

Moderated by  Allan Gill, Jon W. Whitley 


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