Clean up Nikasil bore?

[nzspokes]

Doing rings on a XT225. Bore is in good shape but has some carbon above the ringland.

Whats the best way to clean it up?

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[Scubbo]

twist of the right wrist

[OddDuck]

I've had good luck with a witches brew of two parts white spirits to one part isopropyl alcohol, old toothbrush or similar and have at it

[caspernz]

Not that I would ever admit to doing it, but 0000 steel wool is quite useful in delicate situations.
Some call it angel hair, in Mitre 10 they call it fine woodworkers steel wool.

[sidecar bob]

Nikasil isint as fragile as you may think. That's the whole idea of it.
I've had great success using all kinds of things I'd get roundly criticised for using, after piston seizure.

[Grumph]

Nikasil isint as fragile as you may think. That's the whole idea of it.
I've had great success using all kinds of things I'd get roundly criticised for using, after piston seizure.

Correct. It does after all, require a diamond hone to put a pattern on it.
Wet and dry paper isn't even going to leave a mark...

[sidecar bob]

Correct. It does after all, require a diamond hone to put a pattern on it.
Wet and dry paper isn't even going to leave a mark...

Yep, I've gone as low as 320 with WD40 to get rid of the alloy bits, working up to 600.

[F5 Dave]

You are supposed to diamond hone to perfectly round.

Scotchbrite stolen from under the kitchen sink will do in a pinch.

[Voltaire]

You are supposed to diamond hone to perfectly round.

Scotchbrite stolen from under the kitchen sink will do in a pinch.

When you say hone...do you mean one of those three legged things you fit in a drill?

I would imagine all they do is follow the existing shape and scuff it up a bit.

Nikasil must be pretty hard as I have 35 year old BMW cylinders, that just needed a scrub up.

I don't think you would want to put a hone near nikasil but then I am only a pen pushing office worker.

[F5 Dave]

Jesus no! No a proper hone for nikasil is the stuff of engine reconditioners not home kit.

[Kickaha]

Yep, I've gone as low as 320 with WD40 to get rid of the alloy bits, working up to 600.

We used to use some type of acid which took the alloy off with out harming the Nikasil

[sidecar bob]

We used to use some type of acid which took the alloy off with out harming the Nikasil

I use that partly to prove if there's alloy still on the bore. It foams the alloy up White & leaves the bore alone, if it foams, I keep cleaning it.

[F5 Dave]

Drain cleaner is sodium hydroxide and attacks ally while leaving an iron bore alone. Used on nikasil it should do the same thing but the coating is a bit porous. If it got through it could attack the ally behind. If so the plating may fall off at a later date. . . Maybe.

[skippa1]

Half round bastard file with some heavy Emery tape.

[husaberg]

We used to use some type of acid which took the alloy off with out harming the Nikasil

using the old sort of green solder flux works on iron bores not sure re Plated ones.
I can even find what it was called it was a green squezy one with ribs on the side.



I use that partly to prove if there's alloy still on the bore. It foams the alloy up White & leaves the bore alone, if it foams, I keep cleaning it.
that one with the flux came from something you posted?

[AllanB]

I though that coating was a zilionth of a thou or something so about the same thickness as a fleas dick?

[pete376403]

using the old sort of green solder flux works on iron bores not sure re Plated ones.
I can even find what it was called it was a green squezy one with ribs on the side.
Duzall 10chars

[husaberg]

Duzall 10chars

looks right but ingredients
Zinc chloride?and 5%hcl it would try it with some cast and some auminium to check first.

As a metallurgical flux
Zinc chloride has the ability to react with metal oxides (MO) to give derivatives of the formula MZnOCl2.[33][additional citation(s) needed] This reaction is relevant to the utility of ZnCl2 solution as a flux for soldering — it dissolves oxide coatings, exposing the clean metal surface.[33] Fluxes with ZnCl2 as an active ingredient are sometimes called "tinner's fluid". Typically this flux was prepared by dissolving zinc foil in dilute hydrochloric acid until the liquid ceased to evolve hydrogen; for this reason, such flux was once known as "killed spirits". Because of its corrosive nature, this flux is not suitable for situations where any residue cannot be cleaned away, such as electronic work. This property also leads to its use in the manufacture of magnesia cements for dental fillings and certain mouthwashes as an active ingredient.
wasnt there a similar one in the blue bottle as well?
341493

According to this its muriatic acid that does the business.
https://www.snowmobilefanatics.com/forums/27-ski-doo/79614-how-clean-out-aluminum-smeared-cyl-walls.html
http://modernvespa.com/forum/topic149547
the green bottle flux used to be made with it, not sure if it still iis though.
I never knew this

Muriatic acid is one of the names for hydrochloric acid.

[rok-the-boat]

Take the barrel and new piston to an engine reconditioner. I was quoted $60 to hone mine.

[nzspokes]

Take the barrel and new piston to an engine reconditioner. I was quoted $60 to hone mine.I used WD40 and scotchbrite. Its now going through a hard break in.

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