201TCM Bogging issue

[BlueMax]

my Son brought home a 201TCM after the Air filter and cover fell off, after replacing the saw ran, but bogs on acceleration and does not appear to want to ‘reset’ after running for 90 seconds and turning off., the ignition could matches with one with the V1 firmware. Carb stripped and generous doses of carb cleaner applied, no crud in the internal filter and jets blown out, no obvious crud in the solenoid and the small o ring looks in good conditions, the bladder looks visibly ok and so does the membrane, but simply cannot get it to run well enough to climb with. The carb is the version that does NOT have the acceleration piston before anyone asks.

 

In desperation took to a local ‘National Agro chain’ who after connecting it to a laptop with the Stihl diagnostics told me that at ‘stage 4’ of the test computer says complete new carb required! So thats £95 for an hour’s work to diagnose and It’s going to cost close to £300 for the replacement carb and them fitting , so wont be doing that! Any ideas what Stage 4 of the diagnostic means?. Any idea what could actually be wrong with the carb? !! I may either try a more thorough clean out, replace just the solenoid, or just buy a carb……will the ignition still reset properly with a new carb and solenoid without using the diagnostics PC? Any ideas? £400 is a lot to repair a functional but bogging saw!!

[Mark_Skyland]

Take the carb off and check the black plastic splitter that fits into the carb body where it attaches to the rubber intake pipe. This plastic piece had a small hole that gets bunged up if the machine is ran without an air filter or if it's used with a damaged air filter cover as it doesn't seal the air filter properly.

I've seen it plenty of times, the saw won't tick over and runs poorly. 

It could also be the solenoid. As they show the same symptoms but I would check the above first.

£300 seems is a bit steep for a new carb and 5 minutes of work! You just put the carb on and that's it. Maybe do a reset if it's not running properly but you don't need a pic to do that.