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Old 5th June 2019, 15:50   #11
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That gradual slowing down and then stopping is just about always the same thing.---Slight binding in the throttle cable. The cable moves past the tight point very slowly due to the vibration from the engine whilst it's running.--If you don't want to tackle the cable then make sure the throttle stop is giving you enough revs to keep the engine running. Then it doesn't matter about the slightly sticking cable.---
It’s not a gradual slowing, it’s like fuel starvation, try squeezing the throttle, and nothing happens, then it dies. Re start it and it will idle no problem, squeeze the throttle and it cuts out.
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Old 5th June 2019, 16:46   #12
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It’s not a gradual slowing, it’s like fuel starvation, try squeezing the throttle, and nothing happens, then it dies. Re start it and it will idle no problem, squeeze the throttle and it cuts out.
The Yanks call it "Bogging Down"generally a tune-up with the mixture screw will sort it, Normally it is because the engine is unable to change from the slow running jet to the high-speed jet thru lack of fuel IE a weak slow running(Tick over)mixture.
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Old 5th June 2019, 18:27   #13
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Mixture has been set John
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Old 5th June 2019, 20:28   #14
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Could the fuel be vapourising in the pipe before it gets to the carb? This was a regular occurrence on my old Lambretta when I stupidly shortened the fuel pipe.

“Bogging down” is a good description - engine runs fine when cold - but when hot - open the throttle and and you get a sort of “fluffing” effect where nothing happens and the inlet manifold can be heard just sucking in air.

If not this - could it be the way it is being held? - could it be fuel starvation due to the angle of use?
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Old 5th June 2019, 22:06   #15
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Mixture has been set John
I think I agree with what Number 6 says.---I don't see that it is set correctly.
Now you have added some more information it is obvious that the reason it cuts out is the mixture weakens. Whatever is supposed to add fuel and air at 12/1 as you open the throttle just isn't doing it.

There is a blockage in a jet or fuel passage.---
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Old 5th June 2019, 22:13   #16
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Mixture has been set John
Well it needs to be set again properly.

I have chain saws,strimmers,hedge cutters and all of them at some point have had this trouble and it is always the same cure............. It needs setting up correctly.
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Old 6th June 2019, 04:25   #17
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Excuse my hijack here Phil, but I have a problem with my hedgecutter.It looses revs and cuts out after only about 10 mins of use, I have had the fuel and inlet pipe replaced, the mixture was reset by a so called 2t expert,who apparently used it for 30 mins trouble free on his own hedge. When I fetched it back from the repairets and usec it straight away,,, after 10 mins.and using it on its side,it dies. Someone said knackered carburettor? Anyone any ideas?

Could the fuel tank air inlet be blocked?



Do you hear the hiss of air entering if the fuel cap is released immediately after it stops?



The fuel pickup in the tanks usually have a very flexible pipe with a weighted end, so that gravity helps keep the pickup under the fuel. Might this not be working as it should - pipe too long or stiffened up with age?



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Old 6th June 2019, 05:42   #18
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Mixture has been set John
Just some more info.

There are two adjustments to be made,1)the high speed running and 2) the low speed running. They have to be balanced with each other otherwise you will get the symptoms you are experiencing.


Then you can set the "Tick over" adjustment when the previous adjustments have been made
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Old 6th June 2019, 14:36   #19
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Could the fuel tank air inlet be blocked?



Do you hear the hiss of air entering if the fuel cap is released immediately after it stops?



The fuel pickup in the tanks usually have a very flexible pipe with a weighted end, so that gravity helps keep the pickup under the fuel. Might this not be working as it should - pipe too long or stiffened up with age?


It has had a new fuel pipe put on Harry.

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Just some more info.

There are two adjustments to be made,1)the high speed running and 2) the low speed running. They have to be balanced with each other otherwise you will get the symptoms you are experiencing.


Then you can set the "Tick over" adjustment when the previous adjustments have been made
John, I have no idea how to do this, I need someone who is confident with stripping down a 2 stroke carb. The bloke who was supposed to have sorted the t initially, cleaned the carb, the jets were cleaned out, put fresh petrol in a new fuel line was installed as the original had gone hard and cracked. He also set the mixture according to a manual on two strokes. When I returned the machine to him the day I collected it, and said it was no different after trying to cut one hedge.This took me about half an hour due to the fact the machine kept cutting out. He said it may get have sucked some dirt through, but if he couldn’t sort it, he would give it to a mate who was a 2 stroke expert.
Now the background on the machine, I ran it at 50/1 fuel/oil mix, since it was new, drained the fuel every autumn, the machine was never a problem for the first 3 years of ownership, then last autumn it was difficult to start. Prior to that, it would start first time. When it did eventually start, it would run for a while, then this problem would arise, and it went on every time I used it after that.As the hedges started to grow again this year, I put the machine in for repair.
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Old 7th June 2019, 10:04   #20
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Just some more info.

There are two adjustments to be made,1)the high speed running and 2) the low speed running. They have to be balanced with each other otherwise you will get the symptoms you are experiencing.


Then you can set the "Tick over" adjustment when the previous adjustments have been made

Mine has a tick-over adjuster and a mixture adjuster. I have never heard of a high speed adjuster.



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