Husqvarna 2100 scored piston.

[Al Smith]

You could probably have Wiseco make duplicates but my word the price would be like the national debt .

 

[Marshy]

I think that picture is as taken off the saw possibly, otherwise you are 100% correct about cleaning these cylinders up. Clean, clean, clean and clean it some more until nothing can be felt or seen. New isn't an option for these old saws, so an attempt should be made.
Now what the world of chainsaws really needs is a decent replacement piston for the 2100, any idears on that one?

CCC has one in the works. It does not sound like a drop in "plug-and-play" piston though.

 

[Stump Shot]

CCC has one in the works. It does not sound like a drop in "plug-and-play" piston though.

Ed Zachary, it's for building up a hot rod, requiring machining and such. Which is cool, but not the same thing as a good quality replacement piston.

 

[Newman]

WOW, Thank you all so much for your imputes.. I have pulled the jug off, and here is the sad story. As you can see I did a very POOR job cleaning up the inside of the cylinder.. I used Hydrochloric Acid thinking it would react with the Aluminum and turn white in color, and when there was no more white it would indicate, my cleaning process was complete. I then used some 500 grit emery paper very lightly, not wanting to damage the nikasil coating. My theory is; that in this Aluminum transfer process, some of the deposits are in the form of Aluminum Oxide which is a product of the high temperatures created by the lean fuel mixture. The Aluminum Oxide is very hard and abrasive, and was not entirely removed by the acid cleaning. Anyway, I'm going to start over and do the proper buffing procedure as instructed by Mastermind.
I'm thinking I will just replace the rings, since the piston is not that bad. Any concerns about that? Also, as you can see this Greek piston has the ring alignment pins over on the exhaust side ( as indicated by the top arrow). I was thinking I should turn the piston around. Is there any reason they marked the piston in this direction? There are no manufacturing marks from any casting company on the piston, and I had to grind the inside in order to get the connecting rod to even fit in between the wrist pin journals. Definitely not the quality that DLA brags about..
I'll save the Johnnie Walker Blue for when I finally get this thing running right. Thanks again for all your help.. Regards, Martin

 

[Dolkitafreak]

Looks like the manufacturer made a mistake, the ring ends should be turned towards the intake side. The piston does still look usable however. As for the cylinder, it needs more cleaning, often when you're done, you can't tell there was ever any transfer.

 

[Al Smith]

Good catch--Dummies put the arrow on the wrong side .

 

[wcorey]

Looks like the manufacturer made a mistake, the ring ends should be turned towards the intake side.

IIRC the 2100 came with a number of different pistons and at least one version had exhaust facing ring pins.
As long as the ring ends clear the ports sufficiently there shouldn't be an issue either way.

 

[Junk Meister]

I'll save the Johnnie Walker Blue for when I finally get this thing running right.

One thing that stands out in a thread like this ;
Every one has an opinion,, most of them good .. but no better way to learn than to ask for advice and then to learn from everyone. Remember to keep us snoopy readers updated

 

[Junk Meister]

IIRC the 2100 came with a number of different pistons and at least one version had exhaust facing ring pins.
As long as the ring ends clear the ports sufficiently there shouldn't be an issue either way.

That is unusual are there many piston/saws this way?

 

[mdavlee]

That is unusual are there many piston/saws this way?

More than you’d think. Some newer Stihl’s have one on the exhaust side and one on the Intake side.

 

[Whitty21]

If you are interested I have both a new in box golf piston. As well as a used jug and slug in decent shape that I may be willing to let go

 

[Mastermind]

If you are interested I have both a new in box golf piston. As well as a used jug and slug in decent shape that I may be willing to let go

You're a good man. I'd rather see him learn to clean up what he has, and properly vacuum test it before throwing more good parts at it.

 

[Al Smith]

Pictures can be deceiving but from what I see it looks like the old Scotch -Bright and kerosene treatment would cure what ails it .

 

[Whitty21]

You're a good man. I'd rather see him learn to clean up what he has, and properly vacuum test it before throwing more good parts at it.

Fair point. Cylinders are starting to become unobtainium.

I have had quite a bit of luck saving cylinders with q-tips of muriatic and hand sanding from 150 up to 400grit emory.

One tip I have is to feel for ridges with your nail, not finger tip, as most of us probably have pretty banged up senseless finger tips

 

[Mastermind]

Pictures can be deceiving but from what I see it looks like the old Scotch -Bright and kerosene treatment would cure what ails it .

Maybe. I would go over it with 320 grit, then red scotchbrite to be sure though.

 

[Definitive Dave]

direct drop in replacement also in the works

 

[Al Smith]

Just a comment .The example in question is a CD model,same as mine .From what I gather the XP used a thin ring piston as opposed to the thick ring .Again I'm no expert on Husqvarnas but Copsey had a XP he brought to a GTG that belonged to someone else .It had been tweeked .I think mine has been also .He out ran me over the blocks by a little bit .What surprised me was that thin ring was a breeze to pull over .Mine is like rope starting a Harley .Copsey said that was typical of those models ,

 

[Al Smith]

This talk of repairing cylinders has many options,many would work .This is another option Lisle precision cylinder hone .something you just don't see every day .Unlike a brake hone or standard cylinder hone this can be used to finish hone to almost perfection with regards to taper and ovality .I've only used it on iron cylinders but it has the special shoes and wipers for hard chrome/hard nickle .I'm reluctant to use it on plated cylinders myself preferring to the age old arm strong /elbow grease method .

 

[Mastermind]

This talk of repairing cylinders has many options,many would work .This is another option Lisle precision cylinder hone .something you just don't see every day .Unlike a brake hone or standard cylinder hone this can be used to finish hone to almost perfection with regards to taper and ovality .I've only used it on iron cylinders but it has the special shoes and wipers for hard chrome/hard nickle .I'm reluctant to use it on plated cylinders myself preferring to the age old arm strong /elbow grease method .

I have one of those.....great tools for final finish on iron bores. Like you, I've never tried it on plated bores though.

 

[Al Smith]

Then comes the problem of getting the residue out of the cylinder after it's been worked over . Compressed air isn't going to cut it . A bucket of kerosene with an old paint brush might . Adam Clarke stuck it in the kitchen sink in hot water with dish soap like Dawn and a sponge .Snelling ,a braver man than I stuck them in the dishwasher .If I did that it would be about as popular as a turd in a punch bowl .I just use hot water in a bucket and Dawn ---outside not in the kitchen. Heaven forbid !