Author Topic: not running right  (Read 665 times)

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Offline Owen

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Re: not running right
« Reply #15 on: April 17, 2019, 01:27:20 pm »
They are not obsolete in my book. Still ticks the boxes for me.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline elevensies

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Re: not running right
« Reply #16 on: April 17, 2019, 02:14:04 pm »
stripped carb today, took it to a place who will ultrasonic clean it, see what happens from there

i love the fact its not press n go, but i would have liked, even a little bit of a go up the road

Online hampshirebiker

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Re: not running right
« Reply #17 on: April 17, 2019, 02:24:19 pm »
I presume you removed the brass jet block. That's the part that needs cleaning. Can't be done whilst still in the carb body. I expect you knew that, but no harm in reminding the un initiated.
Postal - Liphook Hants - But just into West Sussex.

Online Tman

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Re: not running right
« Reply #18 on: April 17, 2019, 03:43:57 pm »
They are not obsolete in my book. Still ticks the boxes for me.

A sixty-seventy year old design not obsolete? You do know BSA aren't around anymore either, Owen..? ;)

Online timsdad

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Re: not running right
« Reply #19 on: April 17, 2019, 04:36:42 pm »
Ultrasonic cleaners very rarely do what they're supposed to do. I've tried a variety of fancy additives in mine and the result can look good but don't take it as guaranteed that those hard-to-reach pilot galleries have been cleaned or even improved.

A submerged soak in cellulose thinners is the only thing that'll shift the crap and one carb of mine took  over a week of this. This was after about four sessions in the ultrasonic cleaner.



My pens and pencils are obsolete now but I don't lose all the information I've written down when there's a power cut. Sometimes old stuff is better.


Ray
Just a motorcyclist.

Online hampshirebiker

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Re: not running right
« Reply #20 on: April 17, 2019, 04:47:44 pm »
I'm 100% with Ray's remarks. Ultrasonic cleaners are only mini dishwashers. And don't forget the tiny hole in the middle of the semi spherical recess in the side of the block. Best to poke it through with the bristle of a wire brush.
Postal - Liphook Hants - But just into West Sussex.

Offline Owen

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Re: not running right
« Reply #21 on: April 17, 2019, 05:56:40 pm »
Depends on what you have. I have a small commercial one and use it with screwfix degreaser, put the heater on and does a good job.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Online camman3

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Re: not running right
« Reply #22 on: April 17, 2019, 08:01:39 pm »
I also seem to get better results from my ultra sonic cleaner than is often reported here.
I usually run it at 50c for an hour or so and it has cleaned gummed up jet blocks etc with no problem.
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Online timsdad

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Re: not running right
« Reply #23 on: April 17, 2019, 08:40:35 pm »
I bought a top of the range one several years ago, big enough to take two carbs, and have tried it every-which-way with a variety of stuff. It seems, though, there's not a lot of difference in it and a bit of shampoo or soap in the water is as good as anything - it only has to break the surface tension down so it'll go into small spaces.

It's the tiny bubbles that do the cleaning and if the fluid can't get into the little pilot galleries then there'll be no bubbles to rattle the scale off. The main thing it achieved was buggering up the stainless sink in our utility room and she won't let me forget it.

I can only think the carbs I've cleaned have been worse than anyone else's.


Ray
Just a motorcyclist.

Offline elevensies

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Re: not running right
« Reply #24 on: April 17, 2019, 10:00:18 pm »
well got carb back, fiyyed it all back together, looked clean,

bike started first kick, settled down on tick over nice, few revs and felt sharp

popped it in gear (on a stand) and ran it through the gears well, popped it off stand into first and off we went, then stop

back to the same routine, tickle float re start etc etc etc (imagine every minute or so having to keep pressing the tickler to keep it going)

so its fuel flow, time to get further into this


Online camman3

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Re: not running right
« Reply #25 on: April 17, 2019, 10:27:48 pm »
Are you certain fuel is flowing from tank to carb ok, as i suggested way back?
Carb flange seal ok?
Float level too low?
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline John M

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Re: not running right
« Reply #26 on: April 17, 2019, 11:40:08 pm »
Sounds as though it could be a sticking float or float valve.

Offline elevensies

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Re: not running right
« Reply #27 on: April 18, 2019, 03:01:35 pm »
Are you certain fuel is flowing from tank to carb ok, as i suggested way back?
Carb flange seal ok?
Float level too low?

yup, fuel in full flow, if i hold down the tickler i can see fuel flowing through the in line filter, when i let go fuel stops, as it should

new gaskets, new washers, and pre set copper float.

now i did mention this a few posts back where i manually raised the float, but all that then happened was fuel just filled the bowl and poored out through the little hole, so re set height, fuel stopped.

im thinking that the fuel in, to the carb is being cut short, its just another one of those  need to see it, kind of things.

Online camman3

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Re: not running right
« Reply #28 on: April 18, 2019, 04:03:19 pm »
Does it just cut out, or falter then stop?
Are you certain pilot galleries are clear?
Fouled plug? have you tried another? strong or weak spark?
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline John M

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Re: not running right
« Reply #29 on: April 18, 2019, 04:30:12 pm »
well got carb back, fiyyed it all back together, looked clean,

bike started first kick, settled down on tick over nice, few revs and felt sharp

popped it in gear (on a stand) and ran it through the gears well, popped it off stand into first and off we went, then stop

back to the same routine, tickle float re start etc etc etc (imagine every minute or so having to keep pressing the tickler to keep it going)

so its fuel flow, time to get further into this

If the above is true then, as I previously posted, there's a good possibility that the float or float needle is sticking. Tickled carb runs until the fuel level in the float chamber drops because the float / needle has stuck preventing more fuel entering - until you ' jiggle ' it with the tickler and repeat the sequence. An easy way to check this out is not to tickle  it again when it the engine stops, instead just tap the float bowl a few times with the plastic handle of a screwdriver or similar and try to restart it.

Of course this could be a red herring but  unless you rule out the simple things you'll end up just chasing round in circles.