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Carb tweakin #67757
01/19/07 11:51 pm
01/19/07 11:51 pm
Joined: Nov 2006
Posts: 326
Boston -
Mike667-neighbor of the beast Offline OP
BritBike Forum member
Mike667-neighbor of the beast  Offline OP
BritBike Forum member
Joined: Nov 2006
Posts: 326
Boston -
Hey All
wondering if anyone has a suggestion - or even if it really is a problem more than me just thinking it is - i replace my amals w/ a single mikuni (with panics/victory libary needle/jets settings etc.)on my 73 850 -when warmed up runs great, starts right up (cold two-three kicker, warm a one kicker), idles at 800,
question is when I start it when its cold i have to keep the choke on the carb on for a while (couple of minutes at least), if i turn it off before shes warmed up the bike will die, and if i blib the throttle while shes cold, even with the choke on it will "gasp" for air (a poor term i know) - wondering if its just the nature of the mikuni itself (or the carb needs a little more adjustment)or maybe something worn in the top end?
any ideas would be great
thanks
Mike667 beerchug


73 850 Commando
75 Ducati 750gt
78 Laverda 1200
97 Ducati 900 SS
61 BSA A10
62 Triumph T110
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Re: Carb tweakin #67758
01/20/07 1:00 am
01/20/07 1:00 am
Joined: Nov 2006
Posts: 326
Boston -
Mike667-neighbor of the beast Offline OP
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Mike667-neighbor of the beast  Offline OP
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Joined: Nov 2006
Posts: 326
Boston -
Thx Panic!

guess i was so used to those wore out amals!


73 850 Commando
75 Ducati 750gt
78 Laverda 1200
97 Ducati 900 SS
61 BSA A10
62 Triumph T110
Re: Carb tweakin #67759
01/20/07 1:16 am
01/20/07 1:16 am
Joined: Jul 2003
Posts: 124
Nebraska, jealous?
B
Brithit Offline
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Brithit  Offline
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B
Joined: Jul 2003
Posts: 124
Nebraska, jealous?
Mike,

Both of my Commandos do exactly that. Neither like the "choke" on for much more than a few seconds. Only when it is really cold am I able to leave it on for any longer. I always try to flip up the lever ASAP, and let it idle on its own. Trying to give any gas will give the gasp you describe.


Don W.

'69 Trident - U.S. Variant
Nortons: '72 Combat ' 75 Interstate
'59 Velocette Venom Clubman
Re: Carb tweakin #67760
01/20/07 4:28 am
01/20/07 4:28 am
Joined: Nov 2006
Posts: 274
The Valley of the Sun,Arizona,...
CommandoRoadster Offline
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CommandoRoadster  Offline
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Joined: Nov 2006
Posts: 274
The Valley of the Sun,Arizona,...
Yep, my '71 with a single Mikuni acts exactly the same way.I just let her warm up while I put on my cold weather gear(which here in AZ consists of helmet, jacket, and maybe gloves, if it's really, really cold, like 50 degrees laugh )Once she'll accept the throttle without gasping, I can usually flip off the choke, and she'll idle.

The Mikuni actually has a separate circuit that opens up when you flip the enrichener lever,instead of an air valve, like most other carbs.Thats why you get that "gasp" when you blip the throttle.You're basically just letting more air in there, instead of a richer mixture, like with a standard,air valve type choke.The Mikuni enrichener is really only effective with the throttle closed.

Sure does idle nice once she's warmed up,don't she?
beerchug
Bruce

Re: Carb tweakin #67761
01/20/07 5:15 am
01/20/07 5:15 am
Joined: Feb 2004
Posts: 1,956
Flint,Mich
norbsa48503 Offline
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norbsa48503  Offline
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Joined: Feb 2004
Posts: 1,956
Flint,Mich
One of these fine days I am going to take my set of 20 pilot jets and ever so slowly bump them up towards the 25's that are in there now. Mikuni does have it's advantages over the mark2 Amals. the 20's are real good warm and very unpredictable when it's time for a start hot or cold.The 25's are predictable but just a bit dull.


norbsa
1960 TR6
1963 Super Rocket
1965 650 Star
1966 441
1968 Thunderbolt
1969 Twinkle 250
1972 Fastback
1974 Roadster
1970 S.S
Way too many BSA's not named
http://decentcycles.com
Re: Carb tweakin #67762
01/20/07 5:01 pm
01/20/07 5:01 pm
Joined: Feb 2004
Posts: 1,956
Flint,Mich
norbsa48503 Offline
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norbsa48503  Offline
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Joined: Feb 2004
Posts: 1,956
Flint,Mich
So, whens The AMAL mark 2 book coming out Panic? I removed the stock enricher bushings could one take those and bore them to a new more useful size?


norbsa
1960 TR6
1963 Super Rocket
1965 650 Star
1966 441
1968 Thunderbolt
1969 Twinkle 250
1972 Fastback
1974 Roadster
1970 S.S
Way too many BSA's not named
http://decentcycles.com
Re: Carb tweakin #67763
01/20/07 5:54 pm
01/20/07 5:54 pm
Joined: Jun 2004
Posts: 411
Columbus, Ohio, 1978 T140E
T
tomterrific Offline
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tomterrific  Offline
BritBike Forum member
T
Joined: Jun 2004
Posts: 411
Columbus, Ohio, 1978 T140E
The AMAL MKII uses pilot jets in the enrichener circuit. Why not just buy the #25 jet? I use #25 in the enricheners of my MKIIs.

Re: Carb tweakin #67764
01/20/07 6:37 pm
01/20/07 6:37 pm
Joined: Feb 2004
Posts: 1,956
Flint,Mich
norbsa48503 Offline
BritBike Forum member
norbsa48503  Offline
BritBike Forum member
Joined: Feb 2004
Posts: 1,956
Flint,Mich
Tom you kind of missed the whole point. I was trying to point up that I am using 25 now to cure the unpredictable but not impossible starting on 20's and if I were running Mikini's I would have three or so more stock idle jets to choose from it is a Mikini thread ya know.


norbsa
1960 TR6
1963 Super Rocket
1965 650 Star
1966 441
1968 Thunderbolt
1969 Twinkle 250
1972 Fastback
1974 Roadster
1970 S.S
Way too many BSA's not named
http://decentcycles.com

Moderated by  Dave Comeau 


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