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!!