Chainsaw Repair

Interesting read on stihl coils.

(A while ago I posted a problem with a MS280 ignition problem and later a starting problem with a FS100 which again turned out to be the electronic ignition unit. Measuring both units with a DVM on the LT side they both gave a reading of +2M ohms both ways, whereas the new units gave a reading of say +6Kohms, so any unit that give a 2 meg ohm reading is faulty. Both units are 10 yrs old with light use, I'm not moaning about Stihl products but it may help with anybody with a similar fault to check the low tension side of the ignition units, both units are slightly different so I couldn't swap to test.

The symptoms were similar the MS280 kept cutting out or would run for a while then cut, suggesting a blocked carb but then it ran for 30 sec and died - no spark. The brush cutter was a sod to start but ran ok but still had a weak spark, so again I thought it was a carb problem.

Both units are now starting first time and running well)