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FS 400 stops

#1

C

cherami

I have this strimmer which has had a replacement carburetor, ignition coil, piston ring, new fuel lines and repaired wiring near the junction with the motor. It starts but then after a short while it stops and will not start again. The next day it starts again but as I said does not stay running. Any clues please.


#2

A

Auto Doc's

Hello C.,

Are you using the proper fuel/oil mix? I don't recommend store bought Tru-Fuel, that stuff has created more headaches than anything.

Verify you are not losing spark if it is an aftermarket coil. Only use Stihl brand ignition coils.

The correct spark plug number is also very important also but avoid Amazon for any parts.


#3

S

slomo

cherami said:
and repaired wiring
Click to expand...
Look at this first. Soft copper wires with probably a crimp connection joint = a recipe for disaster. All the engine vibes will kill a poorly terminated butt connection. Check continuity here.


#4

C

cherami

slomo said:
Look at this first. Soft copper wires with probably a crimp connection joint = a recipe for disaster. All the engine vibes will kill a poorly terminated butt connection. Check continuity here.
Click to expand...
Yes will look at that again, think I could also do with another handle for the throttle and switch, getting pretty old.


#5

C

cherami

Auto Doc's said:
Hello C.,

Are you using the proper fuel/oil mix? I don't recommend store bought Tru-Fuel, that stuff has created more headaches than anything.

Verify you are not losing spark if it is an aftermarket coil. Only use Stihl brand ignition coils.

The correct spark plug number is also very important also but avoid Amazon for any parts.
Click to expand...
Use 95 lead free and stihl oil mix at 50 to 1.
The price of Stihl ignition coil here in France range between 130.00 to 180.00 euros very expensive and one can never be sure they are genuine.
Has original number spark plug. I use the green spark web for most electrical.


#6

C

cherami

Please not I am not being informed of replies is there something wrong with the system please.


#7

Tiger Small Engine

Tiger Small Engine

cherami said:
I have this strimmer which has had a replacement carburetor, ignition coil, piston ring, new fuel lines and repaired wiring near the junction with the motor. It starts but then after a short while it stops and will not start again. The next day it starts again but as I said does not stay running. Any clues please.
Click to expand...
Clean and replace the OEM Zama carburetor with the aftermarket one you probably put on. Do not spend any more money for parts on this trimmer.


#8

A

Auto Doc's

Hello C.,

Check the piercing spring at the end of the coil wire, it attaches to the plug that is covered by the boot. I have seen then wear loose in the end of the coil wire and cause problems like this. Some had this faulty design, and some did not.


#9

C

cherami

Tiger Small Engine said:
Clean and replace the OEM Zama carburetor with the aftermarket one you probably put on. Do not spend any more money for parts on this trimmer.
Click to expand...
New aftermarket carb original much too expensive here in France. It is an old strimmer but it cost me 1000 euros so dont really want to get rid of it.


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