Carb cleaning

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Jon K
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Carb cleaning

Postby Jon K » Thu May 17, 2018 6:58 pm

Apologies if this has been covered too often...

I’ve bought all the gubbins to refurb my carbs, jets, needles, diaphragms, o rings, floats, the lot. (140 quid’s worth!)

My question: once I’ve stripped the carbs down to just the carcasses (if that’s the word) do I need to get them ultrasonically cleaned, or is there a more diy method? I bought some Würth air intake and throttle valve cleaner on a whim, I don’t know if it will be useful. I know I’ll need compressed air.

Any advice gratefully received.

Jon
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Bike - 1981 R100 /7T
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windmill john
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Re: Carb cleaning

Postby windmill john » Thu May 17, 2018 9:03 pm

Whilst ultrasonically cleaning should get all crud out of all orifices, your Würth should help; with the air as mentioned.
When I first got Schorsch, I thought I’d done a thorough clean, but it took three strips to be spot on.
If I could have got an ultrasonic bath, I would have.

I think some one here have had success boiling the bodies, I’m don’t know if I want to try that.

For me, making sure at the end of the clean, you saw decent squirts of carb cleaner, propelled by air appearing at the end of all jet ways.
http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Schorsch 1978-80 R65 - bit of a Shetland pony; frisky and naughty.
Too many bikes have come and gone, trying to be sensible now!

Jon K
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Re: Carb cleaning

Postby Jon K » Thu May 17, 2018 9:05 pm

Boiled like pasta carb-onara?
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Re: Carb cleaning

Postby Quzzy » Thu May 17, 2018 11:22 pm

Strap a orbital sander to a container and fill with detergent, switch on for 20 minutes. It works....though I have to admit to upgrading to a proper 22l ultrasonic cleaner after 40 years!
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Re: Carb cleaning

Postby Roy Gavin » Thu May 17, 2018 11:46 pm

All you need for the carb to work properly is a pressure pack and to spray it down all the holes so it comes out where it should.
Finding a drawing which shows all the holes is next to impossible - I haven't seen one which shows the hole in the cap, both of the airways which run parallel to the intake or the complete choke circuit.
But please, IU am open to correction if anyone has found them!

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Re: Carb cleaning

Postby SteveD » Fri May 18, 2018 1:29 am

Missing the aux carb bits...

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windmill john
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Re: Carb cleaning

Postby windmill john » Fri May 18, 2018 8:19 am

plagiarising Steve's piccy.

After removing all jets and mixture screw, block mixture screw hole at the blue spot. Make sure if you use your finger, you have nitrile gloves on.
Spray judicious quantities of carb cleaner up 'A' to clear idle circuit to 'B'
Follow this with compressed air. You want to see spray coming out of 'B'.
Spray from 'C' to 'D' as above.
Spray down the petrol inlet pipe as above to flush through to 'E' (Make sure you have removed the needle valve first!)
You will see two small holes at 'B', the other hole comes from (I think) the choke area, cannot recall. Anyway, spray it as well.

On top of this, make sure you have stripped the choke assembly and do as above, as well as spraying through the choke passageways.

carb.jpg
John
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http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Schorsch 1978-80 R65 - bit of a Shetland pony; frisky and naughty.
Too many bikes have come and gone, trying to be sensible now!

Rob vW
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Re: Carb cleaning

Postby Rob vW » Fri May 18, 2018 8:58 am

I would do all of the above. Strip the carbs, soak all the jets and carb body in carb cleaner and put everything in an ultrasonic cleaner (I use Sea Clean in the water in the ultra sonic cleaner) to get rid of every last deposit.

You can get small ultrasonic cleaners at quite reasonable prices. Admittedly the small ones won't take a whole Bing carb in one go so you may have to turn them over several times to clean thoroughly, but the one I have will take a whole Amal 600 carb and there are 3 on a T150! And its rare you need to clean the whole carb. The problems are usually the jets and its quite satisfying to watch clouds of crap come off components when in the ultra sonic cleaner.

Then you need to blow all the carb orifices out with a can of air duster (£1. at Pound Land) to get rid of all traces of liquid that might be left behind.

Then, reassemble the carbs very carefully with all new rubber parts. Put some Vaseline on the jet o rings when reassembling so that they don't tear up.

Jon K
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Re: Carb cleaning

Postby Jon K » Fri May 18, 2018 9:19 am

Some really great responses and advice. Thanks chaps.

Jon
Email - jonathan.keay@hotmail.co.uk.
Bike - 1981 R100 /7T
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Re: Carb cleaning

Postby DEEP DIVER » Fri May 18, 2018 11:03 am

I pick up a small ultrasonic cleaner years ago from argos, think it was around £30. Works well on the wife's ear rings and glasses. Just us warm water with a drop of washing up liquid.
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Re: Carb cleaning

Postby Mike D » Fri May 18, 2018 12:41 pm

If you have not stripped the carbs previously then I suggest you strip, clean and reassemble one at a time, to prevent mixing up parts (the choke discs are handed.)

Mike

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Carb cleaning

Postby Jon K » Sat May 19, 2018 12:46 pm

Well so far so good. Left carb is now just a pile of bits. Somewhat annoyingly all the floats, jets, needle and o rings look in good order but I’ll replace them anyway since I’ve bought them. The bar that the float hinges on is a bit bent and scratched up - I can’t imagine that’s been helping but guess what, I haven’t got replacements for those (yet anyway).

Is the needle meant to wobble? I’ve watched videos on the clicking in and out but I’m struggling to replicate what I’m seeing. Could the wire-like bits that hold the needle in the slide be knackered?

Jon



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windmill john
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Re: Carb cleaning

Postby windmill john » Sat May 19, 2018 1:14 pm

Yes the needles wobble.
Great fun matching those clicks isn’t it!... not ](*,)

Make sure all is quiet, get your slide near your ear and take it slowly.
http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Schorsch 1978-80 R65 - bit of a Shetland pony; frisky and naughty.
Too many bikes have come and gone, trying to be sensible now!

Jon K
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Re: Carb cleaning

Postby Jon K » Sat May 19, 2018 1:29 pm

Thanks mate will do.

I rang the only place I know who do ultrasonic cleaning and there was a 3 week wait, so I’ve now got a bucket of hot water and fairy liquid hanging in my loft, with a 1/4 sheet sander tied to the bottom of it.


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Re: Carb cleaning

Postby Jon K » Sat May 19, 2018 5:58 pm

Anyone know how many clicks in (or out) the needles need to be on a 1981 R100 with 40mm carbs?


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Re: Carb cleaning

Postby Jon K » Sat May 19, 2018 8:33 pm

Haynes tells me my needles should be position 3 ‘from the top’. From the top of what? Is that 3 clicks in, or all the way in then 3 clicks out?

Jon


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Re: Carb cleaning

Postby barryh » Sat May 19, 2018 9:23 pm

Bing needles don't look exactly like this but no matter it serves the purpose to answer your question - 3 clicks in.
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Re: Carb cleaning

Postby Jon K » Sat May 19, 2018 9:26 pm

Cheers Barry, much appreciated.

Jon


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windmill john
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Re: Carb cleaning

Postby windmill john » Sat May 19, 2018 9:30 pm

From the top of the needle.

You say you’ve got a wire type thingy, so you need to insert the needle from the bottom until you meet resistance.
Then gently rotate the needle 90 degrees whilst gently pushing up.
You will hear/feel a gentle click; that’s number one.
Two more needed.
http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Schorsch 1978-80 R65 - bit of a Shetland pony; frisky and naughty.
Too many bikes have come and gone, trying to be sensible now!

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windmill john
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Re: Carb cleaning

Postby windmill john » Sat May 19, 2018 9:30 pm

You could have told me you were typing a response Barry! :wink:
http://www.kittos.co.uk
Best roads: 623 Burgos to Santander. A back road to Metz; can't remember which!
Schorsch 1978-80 R65 - bit of a Shetland pony; frisky and naughty.
Too many bikes have come and gone, trying to be sensible now!

Jon K
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Re: Carb cleaning

Postby Jon K » Sat May 19, 2018 9:32 pm

Thanks John, that’s what I’ve done.

Discovered a tip: a Marigold glove makes gripping the needle easy :)

Jon


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Email - jonathan.keay@hotmail.co.uk.
Bike - 1981 R100 /7T
Location - Essex, England
Still a muppet, but learning.

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Re: Carb cleaning

Postby barryh » Sat May 19, 2018 10:33 pm

You could have told me you were typing a response Barry! :wink:
Well I read the thread John and thought I have just the picture for that.


Another tip. It's easy to lose track of the clicks so when you have it set at 3 clicks measure the length of needle that protrudes as a cross check that both carbs are set the same. My bike came to me with one carb at position 2 and the other at 3. It didn't run as badly as you might imagine.

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Re: Carb cleaning

Postby Jon K » Sun May 20, 2018 12:23 pm

Hmmm, one of my slides (offside) isn’t looking too great. Should I a) have a go at it with diminishing grades of wet and dry paper, b) ignore it and hope it doesn’t matter, or c) replace it?

Inside the carb body is a bit the same.

Image

Other than this I’m getting there. My homemade vibration parts washer wasn’t amazing, but better than nothing.

Motorworks only sent one needle, and I’ve had to order two float pivot pins because the originals are a bit bent and scratched up.

I’m also not entirely sure I’ve go the right o rings. The OEM site tells me my bike is a /7T, and that the straight R100 only went up to the late 70s - Haynes doesn’t agree. However, I sent the actual stamped numbers on the carbs to Motorworks so they should have got it right. Maybe they did and the old ones were wrong. Oh well.

Jon


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Bike - 1981 R100 /7T
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Jon K
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Re: Carb cleaning

Postby Jon K » Sun May 20, 2018 12:44 pm

Oh dear, having looked at Motorworks and Motobins sites, it seems replacement isn’t an option :(

Jon


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Re: Carb cleaning

Postby DEEP DIVER » Sun May 20, 2018 12:52 pm

Thanks John, that’s what I’ve done.

Discovered a tip: a Marigold glove makes gripping the needle easy :)

Jon


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Any colour or the same as yours's. #-o
I tried to be normal once, worst two minutes of my life.
Blue belt in Serious tea drinking.

Barry the old goat!!!!
1985 R80ST being rebuilt #-o
1985 R80RT Touring dream :smile:
2 Harley sportsters being rebuilt #-o
And a VW trike so I don't fall off :shock:


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