B50 starts too easily

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steve m
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B50 starts too easily

Post by steve m »

hi all,
this horrendous problem began about 6-7 weeks ago. the mates and i went on a run up the Black Spur (google it) and across to Warburton here in Victoria and i had to bump start the B50 at every stop, very embarrassing.
when i got home i spent a long time cleaning/adjusting the carb etc.
i had fitted an extended throttle stop screw, possibly my first mistake :!: raising the slide can help starting but it can also lead to covering up other problems, kickback and eventually madness (as i discovered :roll:). starting as we all know is a combination of events that has to be just right. well, just right in an ideal world. problems start when adjustments are made to compensate for situations that (known or unknown) have occurred in the system and still, starting occurs regardless (sometimes)
over the years i have used various setups/techniques but usually have settled on the 800rpm idle speed, to create the splash up the bore,whatever -harmless enough.
what seems (in my mind, anyway) to happen is that having the slide higher than it should be , decreases the vacuum signal over the bypass/transfer ports in the venturi of the Amal so everything ends up screwed in/out more than it should be. what i found is there seems to be a sweet spot and this is about 500rpm or there'bouts. hot, cold, idle speed everything seems really good. but it took ages to set up, i was really surprised at how fine the adjustments were on the mixture and slide screws. anyway, in the end i was trying to just ease it over TDC too attempt a start and bingo! it started. and by easing it over i mean slowly/gently pressing on the kickstart from the moment i felt pressure - i would say maybe 3" travel. it did this many times, so for a laugh i thought "i'll try this by hand" and yes, it started.
i think i recall Rickard saying he had done this, but what about the rest of you :?: <201
now for my next topic in "tales of woe". :shock:

steve
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Re: B50 starts too easily

Post by Barry Creary »

Hi Steve what Ign do you have , I know I have ask shis before but demeture :shock: has set in
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Re: B50 starts too easily

Post by Barry Creary »

Hi Steve what Ign do you have , I know I have ask this before but demeture :shock: has set in
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Re: B50 starts too easily

Post by steve m »

dementure, what's that?
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Re: B50 starts too easily

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dementure, what's that?
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Re: B50 starts too easily

Post by steve m »

Tri-Spark Baz. Classic Twin. easy-peazy.
for what it's worth IMHO you can have the puniest spark happening somewhere near the right spot and, if the carbie is set up right, the engine will start. if the carb isn't close, you are asking a lot. :(

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Re: B50 starts too easily

Post by Jack Gifford »

"Starts too easily..."- that's a subject-line you won't see by me anytime soon... :(
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Re: B50 starts too easily

Post by b50root »

steve m wrote: i think i recall Rickard saying he had done this, but what about the rest of you :?: <201

steve
Yes I did it om Lotties ( My wifes T25 ) I could probably do it on my B50 but I don´t dare. Don´t want my elbow in my nose.


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Re: B50 starts too easily

Post by steve m »

you know, doctors say that "your elbow is the only thing you should ever stick in your ear!'. so i guess, from that, that it is ok to pick your nose with it :shock: :oops:
what we need here Rickard, is the standard disclaimer - "don't try this at home"

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Re: B50 starts too easily

Post by beat »

Hmmmm <201 <201
steve m wrote: i had to bump start the B50 at every stop
and:
steve m wrote:what we need here Rickard, is
only one answer: the Electro Starter!
<213
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Re: B50 starts too easily

Post by b50root »

beat wrote: only one answer: the Electro Starter!
<213
Who needs a Electric starter? Fix your bike instead!

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Re: B50 starts too easily

Post by beat »

b50root wrote:Who needs a Electric starter? Fix your bike instead!
:oops: :oops: :oops: :oops: :oops: <926 <926 <926 <926 <925 <925 <925 <959 <959 <959
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Re: B50 starts too easily

Post by steve m »

b50root wrote: Who needs a Electric starter? Fix your bike instead!
exactly :!:
<201 although, <201 maybe in another 20 years with an 80 year old right leg................a 12V leg might be easier. :cool:
who knows....it might even be finished by then :oops: just ave'n a larf Beat. :smile: ;-)

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Re: B50 starts too easily

Post by Jack Gifford »

b50root wrote:
beat wrote: ... fix your bike instead!...
I would love to "fix my bike". But since it starts okay with my son kicking and runs great, WHAT exactly do I "fix"? :?:
"Motley" bike history: Horex 400, 1940 HD 45 FH, HD Baja 100, '49 Indian Scout 440, Victor 441 Roadster, H*nda TL125, Guzzi V50, H*nda FT500, 400-4, NX250
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Re: B50 starts too easily

Post by b50root »

Jack Gifford wrote:
b50root wrote:
beat wrote: ... fix your bike instead!...
I would love to "fix my bike". But since it starts okay with my son kicking and runs great, WHAT exactly do I "fix"? :?:
Well if Steve can start his bike with his hand and my Little 55 KG Wife can start my bike, there must be something to do.
But I also have to say. It took me 2 weeks Before I could start my bike when I bought it ( 30 Years ago, and I was a biker with several 500 CC singles ), And ( Gerry ) minetymenace did´t start my bike that easy when he stole it.

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Re: B50 starts too easily

Post by minetymenace »

And I left the choke on once I got it going! (If I had taken the choke off, I would have ridden it back to Blighty!)
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Re: B50 starts too easily

Post by Jack Gifford »

"... choke...". Hmm... Anybody ever added a choke to the Amal on a B50?
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Re: B50 starts too easily

Post by HPbyStan »

Some of them came with a choke Jack.
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Re: B50 starts too easily

Post by steve m »

i do know that when i had the JRC/Keihin on my B50 it started a lot more consistently with the enrichener. that is until the vacuum started to pull the plunger back down, must have got worn from over use or sumtin. :shock:

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Re: B50 starts too easily

Post by midgie »

my b50 also starts too easily what do you guys think is wrong with it? I have read in many publications that they are terrors to start, but mine will start first kick hot or cold. its running std electrics and points all well over 40 years old. I suppose I could put a boyer system on it that should stop its cheek!
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Re: B50 starts too easily

Post by beat »

midgie wrote:start first kick hot or cold.
:ok :ok :ok
midgie wrote:its running std electrics and points all well over 40 years old
:thumb :thumb :thumb :thumb :thumb
midgie wrote:I suppose I could put a boyer system on it that should stop its cheek!
:!: :!: :!: <213 <213 :ok :ok :ok :thumb :thumb
:ban :ban :ban
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Re: B50 starts too easily

Post by minetymenace »

beat wrote: <986


>44
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Re: B50 starts too easily

Post by Jack Gifford »

HPbyStan wrote: ... Some of them came with a choke...
Some B50s or some Amals?
"Motley" bike history: Horex 400, 1940 HD 45 FH, HD Baja 100, '49 Indian Scout 440, Victor 441 Roadster, H*nda TL125, Guzzi V50, H*nda FT500, 400-4, NX250
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Re: B50 starts too easily

Post by beat »

<201 <201 <201 <201 <213 <201 <201 <201 <201
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Re: B50 starts too easily

Post by b50root »

Jack Gifford wrote:
HPbyStan wrote: ... Some of them came with a choke...
Some B50s or some Amals?
Both. My ex wife B50 had Choke.

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Re: B50 starts too easily

Post by Jack Gifford »

Were those concentric Amals that sometimes had chokes?
"Motley" bike history: Horex 400, 1940 HD 45 FH, HD Baja 100, '49 Indian Scout 440, Victor 441 Roadster, H*nda TL125, Guzzi V50, H*nda FT500, 400-4, NX250
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Re: B50 starts too easily

Post by b50root »

Yes This was.

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Re: B50 starts too easily

Post by Nambo »

Every British bike I ever had I took the choke out of.
My B50 however would take some hard kicking to start, compared to the B44.
I figured I wouldn't have to kick it so fast in order to draw fuel in if I increased the vacuum by fitting a choke, so I did, and what do you know, it now starts just as easy as the B44
I don't have an air filter on the B50 which might indicate less vacuum than normal when starting.
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Re: B50 starts too easily

Post by Barry Creary »

Hi B 50ers just read Steves threads again and had a good laugh :laugh at some of his comments and now with a tear in my eyes I write this <917 <980 missing Steve
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Re: B50 starts too easily

Post by beat »

Barry Creary wrote:Hi B 50ers just read Steves threads again and had a good laugh at some of his comments and now with a tear in my eyes I write this missing Steve
missing him two, - but do not missing the Amal carbi
<213 <214 <213 <214
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