Husqvarna 540 mark 3

[andym31]

Has anyone had any issues with the mark 3? 

 

Mine sh!t it self last week blowing the plug out its housing stripping the threads 

[kram]

Its either not been tightened fully or had dirt in the thread - making it feel tight but still being loose. I had the same on my CBR600 motorbike.

 

Should be quite easy to helicoil. Best to pull the cylinder off first so it can be reassembled clean, but on the CBR6 I helicoiled all four in situ as getting a 4T bike engine apart and back together is a fairly huge job.

 

If you do it with the saw assembled, set the engine with exhaust port open, use plenty of grease on the tap to catch any swarf then flush it out with 2t mix fuel.

 

 

 

[openspaceman]

3 hours ago, kram said:

 

If you do it with the saw assembled, set the engine with exhaust port open, use plenty of grease on the tap to catch any swarf then flush it out with 2t mix fuel.

 

 

 

I've done that with a car engine (Subaru 1800 turbo) . Near bdc on the induction stroke pump grease in. Bring piston up until grease at bottom of plug hole. Tap thread, screw in helicoil, break tang then bring piston to tdc to eject grease with tang and swarf. Spin engine with plug out to expel excess grease.

 

Not worth doing with a chainsaw engine when you can pull the pot so easily. Well worth using the special helicoil stepped tap to ensure it goes in straight. 

Edited 50 minutes ago by openspaceman
posted from fone with predicted text

[adw]

The joys of 10mm plugs, seen 550/560 blow them out.

[spudulike]

Care needed but you can helicoil them without stripping the engine but care with where the piston is, grease and stuffing the cylinder is all part of it as is using the compressor airline with the exhaust port only slightly open is all important.