BritBike Forum logo
BritBike Sponsor BritBike Sponsor
BritBike Sponsor BritBike Sponsor
BritBike Sponsor BritBike Sponsor
BritBike Sponsor BritBike Sponsor
The Bonneville Shop BritBike Sponsor
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum
| Spiders Cartoons, | DVD- Manuals & Parts books
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Member Spotlight
Bronson
Bronson
Bithlo, Florida
Posts: 175
Joined: June 2011
Show All Member Profiles 
ShoutChat Box
Buy BritBike staff a coffee
Buy BritBike's staff a coffeeStill here since 1996 serving BritBikers, just sayin..
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Newest Members
Bargee, TBC, Vidane, BenM, New_Warrior
10663 Registered Users
Top Posters(30 Days)
franko 112
NickL 54
Popular Topics(Views)
879,263 mail-order LSR
Forum Statistics
Forums34
Topics66,603
Posts668,674
Members10,663
Most Online14,755
May 5th, 2019
Who's Online Now
54 registered members (998John), 441 guests, and 597 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Amal MK1 Premier #500522
08/05/13 1:23 am
08/05/13 1:23 am
Joined: Feb 2013
Posts: 49
colorado
C
coloradobob Offline OP
BritBike Forum member
coloradobob  Offline OP
BritBike Forum member
C

Joined: Feb 2013
Posts: 49
colorado
I have a new AMAL Premier 932. It has a unknown size removable pilot jet that requires the air screw to be 3 turns out. I want a leaner jet. What sizes are recommended? I assume the jet needs to be screwed all the way in, not like it came from Burlen. Bob

Support Your #1 BritBike Forum!

Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Check out British motorcycles for sale:
British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Re: Amal MK1 Premier [Re: coloradobob] #500532
08/05/13 7:06 am
08/05/13 7:06 am
Joined: Aug 2012
Posts: 309
Hampshire, England
DoubleDiamond Offline
BritBike Forum member
DoubleDiamond  Offline
BritBike Forum member

Joined: Aug 2012
Posts: 309
Hampshire, England
You are best to speak with Burlen (or email them) directly.

They do a variety of screw in pilot jets, although I have only ever used the standard (which worked just fine) and the leaner one, which turned out to be too lean.

3 turns out does sound very wrong. Are you sure the existing jet is seating correctly?

HTH


BSA: '71 B175; '68 B25; '71 A65; '71 A75
Triumph: '87 T140; '72 T150v
Re: Amal MK1 Premier [Re: DoubleDiamond] #500540
08/05/13 11:49 am
08/05/13 11:49 am
Joined: May 2013
Posts: 5,560
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,560
West Yorkshire
Originally Posted by DoubleDiamond
You are best to speak with Burlen (or email them) directly.

They do a variety of screw in pilot jets, although I have only ever used the standard (which worked just fine) and the leaner one, which turned out to be too lean.

3 turns out does sound very wrong. Are you sure the existing jet is seating correctly?

HTH


+1

what happens when you adjust the pilot screw either way?
3 full turns is a lot, and most of my bikes run best with the screw closer to the 1 1/4 turn out mark. It sounds to me that either the choke is on?? or the slides are not seating properly to the carb floor.

Im really curious how you arrive at the 3 turns out? is this what the colour tune is telling you it is best at?

what year is the bike? is it a 67 or 68? did you order a carb for a 67 or 68? did you specify anything other than a #20 pilot jet?


beerchug
Re: Amal MK1 Premier [Re: DoubleDiamond] #500552
08/05/13 3:34 pm
08/05/13 3:34 pm
Joined: Feb 2013
Posts: 49
colorado
C
coloradobob Offline OP
BritBike Forum member
coloradobob  Offline OP
BritBike Forum member
C

Joined: Feb 2013
Posts: 49
colorado
I will order a 622/502-15 pilot jet. The box that the AMAL Premier came in lists the pilot as "BUSH". My usual guitar string fit the pilot Burlen sent. The removable pilot jet was 1/2 turn out when delivered. I have tightened it snug. My 73 TR7 had open Bud Ekins style pipes until I recently installed short mufflers. We'll see how the smaller pilot jet works. There's not much tuning info on these. None of my other Amals is much outside 1 1/4 turns out. Bob

Last edited by coloradobob; 08/05/13 3:36 pm.
Re: Amal MK1 Premier [Re: coloradobob] #500555
08/05/13 4:19 pm
08/05/13 4:19 pm
Joined: May 2013
Posts: 5,560
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,560
West Yorkshire
This is interesting, typically a bush pilot jet is equal to #20

http://amalcarb.co.uk/mk-i-Concentric-series/900-series/jets/premier-pilot-jet.html

according to this there is 19 or 21, wonder what they used??

one thing I do know is 15 will be wayyy too small. I tried going from 20 to 25 on a jet once, trying to get the pilot screw closer to the magic 1/5 turns out. It was just way to rich. My personal suguestion would be no lower than #17, and if it is 2 turns out (IF) then leave it at that.

I think the straighter pipe with limited baffel would require a leaner mixture, I think the tuning guide suguests to start with a number 4 slide.

If you don't have this article, you can download it from here

http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=42112#Post42112

read a couple of pages of the thread first though, as one portion of the guide is incorrect.


beerchug
Re: Amal MK1 Premier [Re: Allan Gill] #500560
08/05/13 4:57 pm
08/05/13 4:57 pm
Joined: Oct 2003
Posts: 11,282
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member

Joined: Oct 2003
Posts: 11,282
North Georgia, USA
Originally Posted by Allan Gill
This is interesting, typically a bush pilot jet is equal to #20



And here I was thinking that a bush pilot was one of those guys with a 50 year old de Havilland float plane that took you hunting or fishing in the wilds of Alaska!

Silly me. laughing

[Linked Image]


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA
Re: Amal MK1 Premier [Re: RF Whatley] #500565
08/05/13 5:27 pm
08/05/13 5:27 pm
Joined: Feb 2013
Posts: 49
colorado
C
coloradobob Offline OP
BritBike Forum member
coloradobob  Offline OP
BritBike Forum member
C

Joined: Feb 2013
Posts: 49
colorado
I got the following reply from Burlen:
Dear Mr Bowser,

The brass headed screw in the position opposite to the Pilot Air Screw is the new design of pilot jet which replaces the pilot bush. It is identifiable by the crossed slots in the head. The attached photo shows it in position. The jet is is intended to be screwed firmly into the carburetter. The method of adjusting the idle is unchanged from the standard Mark 1. (The Standard (non–Premier) carburetters now have a plated threaded plug with a single slot screwed into the same position to improve access to the bush for cleaning.)

The ID of the standard jet is 0.017” This is the same as the nominal ID of the former pilot bush which was rated at approximately 23cc. The new jets are also available in 15, 19, 21 and 23 sizes which again are measured in thousandths of an inch. The graduations between the jets are smaller than the 124/026 range of pilot jets, one jet size being equivalent to approximately ¾ of a turn on the Pilot Air Screw. The most popular alternative size so far is the 19. Identification is by rings engraved around the nose of the jet, as listed below.

Premier ID Grooves
1
622/502-15
2
622/502-17
3
622/502-19
4
622/502-21
5
622/502-23


Kind regards,

Phil Beresford
Technical Sales Co-ordinator
Burlen Fuel Systems Limited - The SU and AMAL Carburetter Companies
Spitfire House, Castle Road, Salisbury, Wiltshire. SP1 3SA
Tel: +44 (0)1722 412500 Fax: +44 (0)1722 334221 Email: [email protected] Website: http://www.burlen.co.uk

Re: Amal MK1 Premier [Re: coloradobob] #500572
08/05/13 8:36 pm
08/05/13 8:36 pm
Joined: Feb 2013
Posts: 49
colorado
C
coloradobob Offline OP
BritBike Forum member
coloradobob  Offline OP
BritBike Forum member
C

Joined: Feb 2013
Posts: 49
colorado
British Cycle Supply had the 622/502-15 removable pilot jet in stock for $20.99. It has the single line around the nose. There's no marking on the one that came with the Premier carb. They started with only one size; maybe that's the reason. I'll wait to see how the pilot jet works before going to a #4 slide, which is easy to get. New and Improved can mean not in the supply chain yet. The numbering system was unfamiliar to several major suppliers, but all were helpful. Small throttle opening performance is critical on this bike. I intend to ride a lot of forest service roads. It's got a big rear sprocket and I want stump puller low end torque. Bob

Re: Amal MK1 Premier [Re: RF Whatley] #500574
08/05/13 9:01 pm
08/05/13 9:01 pm
Joined: May 2013
Posts: 5,560
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,560
West Yorkshire
Originally Posted by RF Whatley
Originally Posted by Allan Gill
This is interesting, typically a bush pilot jet is equal to #20



And here I was thinking that a bush pilot was one of those guys with a 50 year old de Havilland float plane that took you hunting or fishing in the wilds of Alaska!

Silly me. laughing

[Linked Image]


laughing You got me RF' grin

Phil at AMAL is a really good guy, helped me out a lot over different issues and getting my retailer account.

I would have thought the jet flowed as much as the original #20 screw in pilot jet, as opposed to 23cc, I also guess that the 17 in the number is the same as 017", which is why we use a 016" guitar string for cleaning.

The removable pilot jet that Brit Cycle are selling for $20.99 if that is each, and you don't mind waiting a couple days longer to receive it, drop me a PM and we can discuss it.


beerchug
Re: Amal MK1 Premier [Re: coloradobob] #500594
08/06/13 12:52 am
08/06/13 12:52 am
Joined: Feb 2013
Posts: 49
colorado
C
coloradobob Offline OP
BritBike Forum member
coloradobob  Offline OP
BritBike Forum member
C

Joined: Feb 2013
Posts: 49
colorado
The 15 thou pilot jet is on the way, but I;m always interested in a good source. This bike is built for dirt roads and trails in the Colorado Rocky Mountains betwen 6000ft (my House) and 12,000 ft. It must pull smoothly at small throttle openings and not soot the plugs on 5000ft descents. Bob

Last edited by coloradobob; 08/06/13 12:53 am.
Re: Amal MK1 Premier [Re: coloradobob] #500623
08/06/13 8:39 am
08/06/13 8:39 am
Joined: May 2013
Posts: 5,560
West Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member

Joined: May 2013
Posts: 5,560
West Yorkshire
Originally Posted by coloradobob
The 15 thou pilot jet is on the way, but I;m always interested in a good source. This bike is built for dirt roads and trails in the Colorado Rocky Mountains betwen 6000ft (my House) and 12,000 ft. It must pull smoothly at small throttle openings and not soot the plugs on 5000ft descents. Bob


Just let me know if you need anything, the only killer might be the shipping.

Your height above sea level will explain the need for leaner jets, AFAIK carbs are normally jetted between sea level and 3000 ft. Some of the Aircraft guys here will be far more aware of jetting at altitude than I will ever be.


beerchug

Moderated by  John Healy 

Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | DVD- Manuals & Parts books
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Powered by UBB.threads™ PHP Forum Software 7.7.1