Husqvarna 365 replacement piston cylinder

[spudulike]

Hi, and thanks for replying. I can see you know your stuff, so please excuse me for making the most of it.

 

Would you mind suggesting what acid or alkali I should use to clean up the cylinder? Is there a set technique I should use? Would just rubbing it with vinegar possibly work?

 

Thanks very much.

 

Best keep the vinegar for your chips. I use Brick acid as it is around 15% HCL/Hydrochloric/Muriatic acid and works well.

 

Sodium Hydroxide/Caustic soda will work but not used that to date.

 

Clean the area with solvent, rub lightly with some emery paper, apply with a cotton bud and leave ten minutes or until it stops fizzing as it will do once the aluminium has turned to salt (not table salt:001_rolleyes:)

 

Clean the area again with solvent, rub with the emery paper and apply the acid again. If it fizzes repeat until all the transfer has gone and no fizzing happens. Any residue should be abraded away and the bore should have no deposits/transfer left.

 

I usually hone lightly or you can hone with emery paper - around 150 grit - it breaks the glaze and helps bed the ring in quicker!

 

If the acid fizzes along a vertical track in a straight line, you have a bad score straight through the plating, avoid using acid here as it will eat in to the underside of the plating.

 

I personally re-bevel the exhaust port as you often get a build up of carbon and transfer around it.

 

I have been doing this for quite a while and with much success - lots of happy people out there with saws others have scrapped:thumbup:

[brisbane trees]

Thank you very much, I'll try this.