Efco 141sp won't idle then floods help please

[Marshy255]

Had this for 4 years without issue

However this week will just not idle and then floods on every attempt to restart. What I've tried so far, clear the flood each time and it will start but seems to be running rich have tried minor adjustments to carb and can hear the difference in adjustments when reving . Also wound on the idle screw however all these adjustments have not resolved the issue

If I do not maintain throttle the saw dies and then floods on every attempt to restart. I do not know if I am barking up the wrong tree but it seems starved of air somehow but don't know why or the cause. I think this because I started the saw a couple of times without the air filter and housing on and the saw maintained a very fast idle but sounded less rich if you know what I mean. As soon as I fitted the filter and screwed the housing on you instantly hear the tickover drop and sounds like it's running rich and then stalls if I leave to idle. Hence I believe being starved of air. So cleaned air filter, made no difference. Changed spark plug no difference

Fitted brand new air filter. No difference.

 

I am at a loss any advice would be greatly appreciated

Regards

Andy

 

 

[Stubby]

9 hours ago, Marshy255 said:

Had this for 4 years without issue

However this week will just not idle and then floods on every attempt to restart. What I've tried so far, clear the flood each time and it will start but seems to be running rich have tried minor adjustments to carb and can hear the difference in adjustments when reving . Also wound on the idle screw however all these adjustments have not resolved the issue

If I do not maintain throttle the saw dies and then floods on every attempt to restart. I do not know if I am barking up the wrong tree but it seems starved of air somehow but don't know why or the cause. I think this because I started the saw a couple of times without the air filter and housing on and the saw maintained a very fast idle but sounded less rich if you know what I mean. As soon as I fitted the filter and screwed the housing on you instantly hear the tickover drop and sounds like it's running rich and then stalls if I leave to idle. Hence I believe being starved of air. So cleaned air filter, made no difference. Changed spark plug no difference

Fitted brand new air filter. No difference.

 

I am at a loss any advice would be greatly appreciated

Regards

Andy

 

 

Metering arm stuck in the carb ?

[bmp01]

1 hour ago, Stubby said:

Metering arm stuck in the carb ?

Does sound like the metering valve (which the metering arm operates) is leaking. Coud be the valve itself - coz its old, corroded, gunked up (and stuck). Or metering arm adjustment out of wack. Or metering diaphragm has degraded enough to be too stiff to operate.

That's what I'd understand by "flooding" a cylinder dripping with fuel. 

[adw]

You need to pressure test the carb, this will tell you straight away if the needle in the carb is leaking, the needle will have a rubber tip which over time will wear, this also raises the metering lever ans causes the carb to leak, a new need and correct adjustment normally cures this, there may also be an issue where the metering diaphragm has hardened, this will also cause the needle to leak, has this machione got a spark arrester in the muffler? this if blocked can give these symptoms.

[Marshy255]

Thank you all for the advice, it's really appreciated and hope you can further advise

 

Is the metering valve, arm , diaphragm something I can check and potentially fix myself ?

As regards pressure testing the carb is this something I can do and how would I go about it

Or is it time to take to a professional?

 

[spudulike]

Depends on your skill set and understanding of engineering. Replacing the parts is relatively simple and may just work, pressure testing carbs needs a Mityvac or similar or a pop off tester which are relatively specialist bits of kit. My advice - change the parts and see if it cures the issue then take it to a specialist.

[Marshy255]

Well I've been trying to up skill myself (YouTube) on metering diaphragm etc

 after your helpful suggestions 

Was wondering if you could give any advice on the carb itself 

I can get a full  diaphram kit ( needle, diaphragm etc) from Efco for about £35

But have also seen under the same kit serial number that the carb is a email oleo-mac 262 or walbro wt-1129 and can buy the individual parts for it. Would anyone be able to confirm this?

 

Also is £35 for for the kit about right?

Regards

Andy

 

[spudulike]

Did the seller have a tricorn hat, twin flintlocks and refer to his horse as Black Bess? If not, he should!!!

You need to look at the side of the carb and read off the numbers, I believe it will be a Walbro WT-780D.

This makes a carb kit for a Walbro WT very likely to replace most of your parts needed.

Something like this may work - 

N/G Carburettor Repair Kit (Walbro WA, WT Carburettors) - Replaces K20-WAT | L&S Engineers

WWW.LSENGINEERS.CO.UK

---

N/G Carburettor Repair Kit (Walbro WA, WT Carburettors) Quality, Non-Genuine Part Replaces OEM No, K20-WAT, K11-WAT Suitable for the Following Applications: WA100...

 

 

[bmp01]

Had the exact same symptoms with a Ryobi saw yesterday. 

Wouldn't start, stinking of fuel, spark plug properly soggy. When it did finally splutter into life the exhaust outlet was covered in fuel and 2 stroke oil. Saw would rev reluctantly and was unable to idle with out help. Winding in the low speed screw didn't really help,  neither did trying to raise idle speed. After the inevitable stall it wouldnt restart, flooded.... 

Pulled the carb back a fraction with fuel lines still connected - it was dripping, inlet port was running with fuel.

I do have a MityVac (with pressure option) so it was easy to see when pressurising the fuel inlet line on the carb that the metering valve wasn't sealing. This saw has a fuel purge bulb so theres a fuel line coming out of the metering chamber - as soon as I put any pressure on the inlet line, fuel and air bubbles came out of the purge bulb line.

My point is; I didnt really need the MityVac for this. A short length of hose and a bit of puff would have been sufficient.  Would have been a bit trickier if there was no purge bulb but doable. Its worth removing the cover to the metering chamber and repeating the pressure test - that confirms if the valve will seal with nothing pressing on the metering arm. 

For this saw the diaphragm had gone a bit stiff and taken a set, enough to hold metering valve open. Might have got away with a tweak on the metering arm but that would be a short term fix, new diaphragm req'd.

Anyway HTH, be good if the PITA Ryobi eperience can shed some light on this Efco problem.

[Marshy255]

Thank you Spudulike   

Presume I am not allowed to name the 2 large website companies that are selling a EFCO 141 carburettor repair kit for £32. Your reference to day light robbery is spot on, especially to the unsuspecting like me. This makes sites like this and the people who share their knowledge and experience so valuable.

Especially to my pocket on this occasion as the site  you linked sell the kit for £4.00.

Well after a bit more you tube I felt confident to remove the carburettor and you were spot on it is a Walbro WT 780 . I removed the cover to look at the metering diaphragm and it does appear stiff. So £4.00 kit ordered

I will update how I get on when it arrives and I have fitted the new diaphragm

thanks for your help and everyone else who has given advice