New flywheel stihl 201 tc

[Tomthetree]

Just now, Paddy1000111 said:

considering the dirty fuel it really does sound like a solenoid issue. What colour is the fuel filter in the tank? 

It was white and I replaced with the orange after reading about the updated filter 

 

I would like to do the fuel lines and solenoid and the gauze and diaphragm but I’m just unsure I can do it and might screw it all up. Iv been doing all the things I can manage after reading the service manual but these bits I’m unsure 

[Paddy1000111]

I haven't had a lot of experience with the gauze filter in the carb getting blocked. I've only rebuilt 20-30 carbs on 2 stroke stuff and not once have I found blocked gauze. I'm sure Spud has had experience with it though! I would replace the solenoid as it's probably the easiest job on the carb, just brush it off with a paint brush, clean around it with some degreaser, undo the screws, pull it out and put a new one in. 

 

Spud will confirm but what colour is your solenoid? The black ones got updated to the white one:

 

Solenoid Valve - Genuine Stihl Part - OEM No. 0000 120 5104

WWW.LSENGINEERS.CO.UK

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Solenoid Valve Genuine Stihl Part OEM Number - 0000 120 5104 Suitable for the Following Applications: MS 201 C-EM, MS 201 C-EM Z, MS 201 C-M, MS 201 C-M Z

 

Edited February 1, 2021 by Paddy1000111

[Tomthetree]

Yea my solenoid is black. Also read about this newer solenoid and am keen to replace mine. 
 

do I need to take the carb off?

 

do I need press fluid ? 

[Tomthetree]

After doing a load of reading a while ago I know my m tronic needs to ‘m tronic upgrade’ which was the fuel filter and solenoid 

[spudulike]

To remove the solenoid, you need to remove the retaining clip held on with a small torx screw which may be interesting without a micro torx screwdriver kit - cheap enough off ebay and good for laptops and phones.

I get a fair number of issues with blocked gauze strainers. You always need to remove it and inspect it with a magnifying glass - I had one catch me out years ago, looked fine but when I pulled it out - it had hardened scum in it. Pump diaphragms can end up with perforated flaps where they seal the holes beneath them - generally on well used machines but it does happen! The carb needs removing to do it.

The upgraded solenoid kit is a good idea. These small spark plugs do get carboned up and can give issues so swap it out. 

The wiring loom under the top handle can stretch and break - best replace it. Symptoms are the kill switch stops working if the black wire or one of the yellow wires breaks.

If the earth breaks, the saw gets loaded up with fuel and keeps dying. If the red wire breaks, the saw gets really lumpy and won't rev out well and expect the idle to die.

 

[Tomthetree]

I think I will replace the solenoid. I have a new spark plug in and hopefully a new solenoid will do it. I’m not song. To attempt the diaphragm or wiring or gauze thanks loads!

[Paddy1000111]

1 minute ago, Tomthetree said:

I think I will replace the solenoid. I have a new spark plug in and hopefully a new solenoid will do it. I’m not song. To attempt the diaphragm or wiring or gauze thanks loads!

Like you say, stick a new solenoid on it and go from there. You're going to need to update it regardless. Do an Mtronic reset and see what happens. If it's no good then rebuild the carb and put a new gauze in. A basic carb rebuild i.e taking the top and bottom plates off and replacing the diaphragms, seals and spraying it out with cleaner is very, very easy to do! 

[Tomthetree]

Looks like I actually have a white solenoid?

 

I will replace anyway but it looks like I need to remove the handle housing to do this?

 

😬

[spudulike]

That is the switch that determines if the choke is open or shut. The solenoid is just above and behind it!

The handle housing is left as is, the fuel line and wires need removal and then draw it out. Getting the choke and throttle rods back on and the carb fitted is the difficult bit unless you know the trick!!

Edited February 1, 2021 by spudulike

[Paddy1000111]

As Spud says, you definitely have the black solenoid