Husky 390XP in poor health

[bmp01]

Don't know the history of this one but it looks like it has some previous. Bought the saw secondhand and I seized it (probably for the second time in its life) whilst doing a 12 inch milling cut after 2'ish metres. Bottom end is rock solid.  Top end less so, aftermarket piston was in there and its now trashed. Couple of piccys attached showing the cylinder condition after chemical and mechanical cleaning. White paper disk at the top of the bore - hopefully better picture. As well as the obvious scoring/discolouration in the bore, can you see the plating has been removed along bottom edge of the exhaust port ? One picture is taken looking down the inlet port just catching this detail. I'm guessing this plating removal was part of the previous clean up when the aftermarket piston was fitted. Just for good measure top cooling fin is busted too, which fits in with the plastics damage.

Saws not had an easy life,  but being what it is I think it's worth saving. Cylinder is a lost cause, certainly not a good place to start if I'm going to spend time porting etc. Replacement options; genuine (too expensive),  secondhand (like rocking horse poo), aftermarket (most likely) meteor, hyway. I've tried our Greek friend, he doesn't stock either. Plenty of Meteor in USA  on ebay but not here. Any one have experience with 390 cylinders? Other suggestions?  

[Toad]

Before you get too far, check the crank isn't spinning inside the clutch side bearing. I thought I was onto an easy rebuild with my 385 before finding that. 

 

I have an aftermarket 390 cylinder of unknown origin that you would be welcome to if you want it, its probably a bit too crap though.. I was looking at getting a meteor piston and cylinder from the US until I had a very kind offer of a NOS one from a member on here.

[AngrySquirrel]

Failing that get it rebored and new piston/rings to match and Re nikasil'd

Friend had his 500cc single SuperMoto bike done

[Stubby]

On that saw I would go OEM and fix the air leak as well !

[AngrySquirrel]

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Aptec Motorsport is Poeton's specialist division for cylinder bore coatings on engines and used to replace traditional...

 

[Macpherson]

34 minutes ago, AngrySquirrel said:

Failing that get it rebored and new piston/rings to match and Re nikasil'd

You just beat me to it ?

 

And for all the mixed messages on how to treat, prepare or clean Nikasil , the guidance in your link couldn't be more concise leaving no room for debate, cheers.

30 minutes ago, AngrySquirrel said:

Splat Shop - Cylinder Replating Service

WWW.SPLATSHOP.CO.UK

 

[bmp01]

1 hour ago, Toad said:

Before you get too far, check the crank isn't spinning inside the clutch side bearing. I thought I was onto an easy rebuild with my 385 before finding that. 

 

I have an aftermarket 390 cylinder of unknown origin that you would be welcome to if you want it, its probably a bit too crap though.. I was looking at getting a meteor piston and cylinder from the US until I had a very kind offer of a NOS one from a member on here.

Hi Toad,

I will check bearing spinning issue, good shout. I've been to see your thread on the subject, I'll check year of manufacture too. And thanks for kind offer of cylinder, looking for known brand I think. 

[bmp01]

1 hour ago, AngrySquirrel said:

Failing that get it rebored and new piston/rings to match and Re nikasil'd

Friend had his 500cc single SuperMoto bike done

Feels like the right thing to do,  fixing the existing. Wonder if blind cylinders are within their experience band. ... 

[bmp01]

1 hour ago, Stubby said:

On that saw I would go OEM and fix the air leak as well !

That'll more than double the price of the saw. Husky cylinder& piston .....300 quid to you sir.

Should have resisted the temptation to rip it apart before leak checking. Ran fine cross cutting, short cuts though. Aftermarket 390 pistons (before Meteor brought one to the market) don't have a good rep, I'm gonna say it was that plus already knackered cylinder 

[Stubby]

13 minutes ago, bmp01 said:

That'll more than double the price of the saw. Husky cylinder& piston .....300 quid to you sir.

Should have resisted the temptation to rip it apart before leak checking. Ran fine cross cutting, short cuts though. Aftermarket 390 pistons (before Meteor brought one to the market) don't have a good rep, I'm gonna say it was that plus already knackered cylinder 

yea but £300  is not bad when you consider its £900 or more for a new saw .