Hedge trimmer jonsered start and stops

[Jonny Vee]

Got an hedge trimmer jonsered HT21 which start and stops.

I rebuilt carburetor but nothing has changed.

Lack of my knowledge but how this carburetor works as there is no primer bulb and only one pipe from the tank.

I can see petrol struggle to reach the carburetor but opening the tank after several pull can feel a bit of air pressure.

Any clarification is welcomed

 

[Burnerman]

Just a factor of some carb designs, Jonny........many chainsaws (Stihl, Husqvarna) don't have a primer or more than one fuel pipe, but of course the tank will have some sort of breather to let air in.
John

 

[Jonny Vee]

What do you suggest to check in order to get fuel from the tank to carburetor? Fuel filter seem to be clean and not sure what else to check.

Just a factor of some carb designs, Jonny........many chainsaws (Stihl, Husqvarna) don't have a primer or more than one fuel pipe, but of course the tank will have some sort of breather to let air in.
John

 

[Burnerman]

See if you can find the tank vent......it may be in the filler cap or a separate part.
The fuel needs to be drawn up to the carb without any bubbles, so try with the fuel cap loose.
If no joy there, it’s a carb strip down I’m afraid.
John

 

[Jonny Vee]

Carburetor rebuilt.

Now start and idle for a little while but if touching the trigger dies.

Tried to reduce and increase the Low but nothing.

I got those on 1 1/4

Any suggestion?

 

[Burnerman]

Does the carb have an H screw? It's this one that allows the machine to speed up and it's usually a symptom of things being too weak so turn it out a fraction and try again. The usual setting is between 1 and two turns out from fully in.
John

 

[Burnerman]

Any identifiying numbers / names on the carb?
John

 

[Jonny Vee]

No numbers

It's a walbro carburetor

 

[Burnerman]

I'd say that is a very early machine, somewhere around 2001 - 2003.
Anyway, I'd try to track down a replacement carb now and here are a couple of numbers that may help.
530035306 WT-221
530069682 C1U-W4 (This one is a Zama equivalent).
Try ebay, Amazon or whatever
John