Carburettor failure

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User00056

Well-Known Member
Bit of an odd one for me, this.

My recently rebuilt KLF has been running like a dream since the rebuild, but when using it to top some grass the other day it just cut out and would only restart on full choke. I pulled the carb' for a look, but could find absolutely nothing outwardly wrong, only signs of general wear. With a new one costing a bare £20, I just ordered a replacement. Arrived today, and was fitted within twenty minutes or so. Wee quad's now running better than ever.

I've never had a carburettor just fail on me out of the blue before. Anyone else experienced it? 🤔
 
Bigstep said:
Probably jets bloked if only runs on choke, I would take them out and ultrasonic clean them
Click to expand...
That was my initial thought. Main and pilot were completely clear though. The only thing I could find was that the slide was slightly scuffed. Moved ok though 🤔 But for a mere £20 it made sense just to change it altogether 👍
 
Bigstep said:
Probably jets bloked if only runs on choke, I would take them out and ultrasonic clean them
Click to expand...
I agree. If it is the carb you can't tell by looking at it, it's got loads of passages through to the jets etc.

I had to do my Honda for the first time in 20 years, the other day. Stuck it in the ultrasonic cleaner for 45 mins, new gaskets and it's now good as new.
 
csl said:
I agree. If it is the carb you can't tell by looking at it, it's got loads of passages through to the jets etc.

I had to do my Honda for the first time in 20 years, the other day. Stuck it in the ultrasonic cleaner for 45 mins, new gaskets and it's now good as new.
Click to expand...
A rebuild kit was £18. A new unit was £20! I just went with the easy route 😃
 
Quixote said:
Bit of an odd one for me, this.

My recently rebuilt KLF has been running like a dream since the rebuild, but when using it to top some grass the other day it just cut out and would only restart on full choke. I pulled the carb' for a look, but could find absolutely nothing outwardly wrong, only signs of general wear. With a new one costing a bare £20, I just ordered a replacement. Arrived today, and was fitted within twenty minutes or so. Wee quad's now running better than ever.

I've never had a carburettor just fail on me out of the blue before. Anyone else experienced it? 🤔
Click to expand...
I had similar on a chainsaw, had been running good, stripped, cleaned no joy.
A new Chinese carb was under £10 posted.

A quick install and all good, Ethanol has a lot to answer for!

Edit; just noted @csl had beaten me to comment on the ethanol.

Bear in mind, 20% ethanol petrol is on its way!!!!
 
eldon said:
I had similar on a chainsaw, had been running good, stripped, cleaned no joy.
A new Chinese carb was under £10 posted.

A quick install and all good, Ethanol has a lot to answer for!

Edit; just noted @csl had beaten me to comment on the ethanol.

Bear in mind, 20% ethanol petrol is on its way!!!!
Click to expand...
Premium fuel for me in any small occasional engines. 10 percent ethanol has a terrible shelf life.
So many things of my dad's I've had to 'fix' but it's just crap fuel. Even a new can for the quad was off. Bright yellow not the usual glass green. Would not start or even try.
 
Quixote said:
Bit of an odd one for me, this.

My recently rebuilt KLF has been running like a dream since the rebuild, but when using it to top some grass the other day it just cut out and would only restart on full choke. I pulled the carb' for a look, but could find absolutely nothing outwardly wrong, only signs of general wear. With a new one costing a bare £20, I just ordered a replacement. Arrived today, and was fitted within twenty minutes or so. Wee quad's now running better than ever.

I've never had a carburettor just fail on me out of the blue before. Anyone else experienced it? 🤔
Click to expand...
On light machinery yes. It only takes almost imperceptible wear on the components or minute tears in diaphragms to make a carburettor fail.
 
csl said:
I have started using Aspen 4 for running the 4 strokes that are occasionally used. Aspen 2 has proved it's worth with 2 stroke so fingers crossed 🤞 it will be ok. You can use Aspen 4 for the last cut of the season and should be all it needs.
Click to expand...
Super unleaded is what I use on the end of the year I.e. garden machinery, or prior to laying up motorbikes for the winter.

Super unleaded is only 5% Ethanol so is the best pump alternative.
 
eldon said:
Super unleaded is what I use on the end of the year I.e. garden machinery, or prior to laying up motorbikes for the winter.

Super unleaded is only 5% Ethanol so is the best pump alternative.
Click to expand...
Super is 10% ethanol mostly, isn't it? :-|

Shell V-Power is definitely 5%, it uses higher octane than would be needed though.

Or... we could go back to regular 4 stroke like we used to use *hint* politicians. ;)
 
Aye very good
I had an issue with a scooter this week that I’m sure was caused by fuel boiling in the carb while it was parked up
 
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