Stihl spark plug problem

[Robert kirkland]

Hi everyone, I have a stihl ms391 and the spark plug threads are damaged on the engine side i think is there a remedy for this ? Probably come loose and blown out

[Stubby]

28 minutes ago, Robert kirkland said:

Hi everyone, I have a stihl ms391 and the spark plug threads are damaged on the engine side i think is there a remedy for this ? Probably come loose and blown out

Helicoil or similar . Spud used a better one but I cant remeber the name . 

[Alan Smith]

Timesert is usually considered to be a bit better than Helicoil.

[Stubby]

53 minutes ago, Alan Smith said:

Timesert is usually considered to be a bit better than Helicoil.

Thats the one. 🙂

[spudulike]

TBH, both helicoil or Timesert will do an effective job if done correctly. One bit of advice is to use a decent quality tap and usually a taper one otherwise there is a distinct chance that the tap will go in at an angle causing sealing issues.

I use Volkel taps as they are decent and not OMG expensive, avoid all these cheap Chinese alternatives as the job is as strong as the quality of the receiving thread.