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Carb jets cleaning advice

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1 year 3 months ago - 1 year 3 months ago #44076 by Gareth Lloyd
Carb jets cleaning advice was created by Gareth Lloyd
Hey guys.....I was after some advice.
I have a really annoying problem with my X1/9.
Car does a cold start absolutely fine. Revs higher during this process of course as the auto choke kicks in.
It's weird...it does idle on my driveway, albeit a little too low.....maybe the idle screw needs adjusting but I've never touched it before.
When I get to full temperature and the auto choke backs off and I go for a spin, I get an intermittant issue that it sometimes won't idle when stationary and cuts out.
I start the car again and have to keeps the revs higher because if I let off the accellerator, it won't idle.
I've not messed about with any mixture settings so have done some digging around and think it may be a blocked idle jet.
Is this quite a common occurance?.....what do you think?
Would the first course of action be to carefully remove each jet, inspect and clean them through before adjusting any mixture or idle settings?
I'd appreciate any advice on removing the jets and how to clean them from anyone that's done this before.
Gareth.
Last edit: 1 year 3 months ago by Gareth Lloyd.

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1 year 3 months ago #44077 by ricardo a p roadnight
Replied by ricardo a p roadnight on topic Carb jets cleaning advice
i had this similar problem when i had my factory metal pancake filter , it was old and the tiny paricles of rust and paint where flaking off and kept blocking the jets , i replaced with a pipercross platic and foam filter and seem to have cured the problem , the jets are easy to clean just unscrew the 4 brass jets that you see when lookin dwn the venturi of the carb and spray carb cleaner thru the tiny holes at the bottom of them , you need a thin nose plier to lift them out , i also very carefully used a tiny strand of a brass wire brush to push thru the hole in them ,just be careful when you lift em out take care not to drop em in the venturis
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1 year 3 months ago #44078 by Gareth Lloyd
Replied by Gareth Lloyd on topic Carb jets cleaning advice
.....thanks Ric.
Luckily, the inside of my air filter is in good order and all the paint is intact.
I want to tackle this at the weekend and put it to bed.
It's taking the enjoyment out of going out as I'm always thinking that it'll cut out at the most inconvenient time!
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1 year 3 months ago #44079 by Alan Hutton
Replied by Alan Hutton on topic Carb jets cleaning advice
This is akin to washing the car - so you clean just the windows and it looks clean from the inside.
The carb really benefits from a full valet!
I have collected much information (as well as personal experience) on these Webers.
The are at their best when clean inside - properly clean.
A good fuel filter is prudent. If you try to clean out your petrol tank and see all the crud and crap gathered at the tank bottom
after all these years and miles and the see the state of the filter on the pickup sock!!
My limited advice would be 1. clean out the tank and its pick up sock. 2. Replace all the fuel pipes unless they are new
3. Fit a good in-line fuel filter. 4. Then strip the carb and carefully clean all jets and insides (plenty of advice online, here and your Haynes manual)
This is a fair amount of evening work but should pay dividends in reliability.
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1 year 3 months ago #44080 by Andy Rowley
Replied by Andy Rowley on topic Carb jets cleaning advice
I would agree with Alan.
Certainly replace the fuel pipes if the are fairly old. Modern fuels can attack the old rubber and they start breaking down. The result is bits of crud getting into the carb and jets.
I am not convinced by in line filters. Mainly because they can get blocked themselves and cause a similar issue. You also have to be sure they are fitted the right way around as well.
However, if the fuel filter "sock" on the fuel tank sender unit is in good condition then it should stop crud from the tank being sucked up into the fuel lines, hence, in my opinion, an inline fuel filter is perhaps not needed. That is just my thoughts.
As Alan suggests, there is plenty of information relating to this topic on the website forum. If after cleaning your jets and the carb and doing the other checks, you are still getting the problem then there are other things to look at, but do the obvious first.
Blue Gran Finale F100FAW
As seen in Classic & Sports car....
As seen in Auto Italia.....
As seen on Fifth Gear....!!!!
Lido ALF 704S
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1 year 3 months ago #44081 by Gareth Lloyd
Replied by Gareth Lloyd on topic Carb jets cleaning advice
.....thank you so much for the input guys.
Yes, I have fitted an in line fuel filter a little while ago. (the correct way around...LOL)
I have some time off work soon so would like to get stuck into it.
I think I might order some new fuel lines as suggested as I'm not sure how old my ones are.....should I get E10 to be sure?
I also think I'd like to check the fuel sender unit and sock and maybe renew things there.
I addition to that, I have also disconnected the crankcase oil breather pipe from the air filter and fitted a filter to it.
I didn't want to choke the carb any more the oil fumes.
I also have some spray carb cleaner that I could soak the jets in.

Gareth.

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1 year 3 months ago #44082 by ricardo a p roadnight
Replied by ricardo a p roadnight on topic Carb jets cleaning advice
my new inline bosch filter ,

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1 year 3 months ago #44083 by ricardo a p roadnight
Replied by ricardo a p roadnight on topic Carb jets cleaning advice
my new inline bosch filter

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1 year 3 months ago #44084 by ricardo a p roadnight
Replied by ricardo a p roadnight on topic Carb jets cleaning advice
deffo a good move disconnecting the pipe from the breather to the carb , it will keep it from getting dirty oily fumes gunking it up , a tip i saw on david moults you tube channel , as you can see ive done exactly the same as he has done , the black ribbed hose exiting the fumes out the back , and deffo get ethanol resistant fuel pipe it will stop possible fire and stop bits of rubber blocking the jets

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1 year 3 months ago #44085 by Gareth Lloyd
Replied by Gareth Lloyd on topic Carb jets cleaning advice
Hey guys,

Okay, I have the jets removed and am soaking them in spray carb cleaner.
I have one question, the bigger longer jets, should you be able to see right through them and out of the end where I have my finger in the photo?
At the moment, I'm holding them both up to the light and I can't see any light when looking directly down the barrel....but I'm not sure if you should be able to.

Gareth.

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1 year 3 months ago #44086 by ricardo a p roadnight
Replied by ricardo a p roadnight on topic Carb jets cleaning advice
i see some tiny amounts of rust beginning in the bottom of the pancake , i had the same , my advice would be to fit a new filter , ie a pipercross or a chrome filter , i have the details for either i can let you have if you need to order one

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1 year 3 months ago #44087 by Gareth Lloyd
Replied by Gareth Lloyd on topic Carb jets cleaning advice
....on closer inspection of the emulsion tubes, I don't think you can look straight through them, only the jets.
Well, anyway....after a good soak and a routine poke through with a wire strand from a brush, I reassembled the jets returned them to the carb. At least the car starts okay and runs.
The only thing I need to tweak is the static timng I think. At full temperature, it's idling around 1000 rpm.
It feels and sounds like it's "racing" a little when idling and I'm getting that familiar "pop....pop...pop" sound from the exhaust rather than a nice steady note.
I also noted that when I dap the throttle and rev a little, it seems to take longer than it should to return to idle.....not much but noticable.
The next big test is to take it for run and hope it doesn't cut out when stationary!
Again.....any advice welcome!

Ric....on closer inspection of my air filter housing, I can see it blistering. Maybe I am getting flakes being drawn into the jets?
Send me or post the link to the new one you installed, I'd like to take a look.

Gareth.

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1 year 3 months ago - 1 year 3 months ago #44088 by ricardo a p roadnight
Replied by ricardo a p roadnight on topic Carb jets cleaning advice
gareth im not tech minded i dont know how to send links but i can go on my emails and post the company that suppl;ys the filters and then you can look them up , i know one of them was burton performance and they have a contact number on there website , i rang before i ordered and spoke to the shop assistant and he was very helpful and told me exactly what i needed to order from there website i will try to find the details for the chrome filter supplier , ok the other company on ebay is eurocarb , and the listing number is 265991214784 he said that will fit as well
Last edit: 1 year 3 months ago by ricardo a p roadnight. Reason: updated info
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1 year 3 months ago #44096 by Gareth Lloyd
Replied by Gareth Lloyd on topic Carb jets cleaning advice
Hi Ric,

I've emailed Burton Performance and Eurocarb for air filters that will definately fit the Weber 32 DATR type carb.
Remind me what you did with your carb cooling fan ducting?
Did you just remove it all including the fan because with the swap out, the carb fan cooling isn't now necessary?

Gareth.

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1 year 3 months ago #44101 by ricardo a p roadnight
Replied by ricardo a p roadnight on topic Carb jets cleaning advice
i removed the fan , its not needed and the ductpipe , let me know how you get on with the new filter fitted , and post a pic of it if you can , i also have electric fuel pump fitted as well

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