How do I fix this cylinder.

[Likesaws]

Got this cylinder off eBay cheap. What should I do to the pitting below the port in center. Plan on doing a little more clean up with the sand paper treatment. Not sure what to do about pin holes. Leave them alone or fill them with something? If so what?

 

[jacob j.]

There is no fixing that (other than sending it off to be re-chromed). You can choose to run it and see how much service life you get out of it but it isn't going to be the best runner.

 

[1990Husky262]

i have run worse than that. Might not be perfect but i think it would run just fine

 

[Frogfarmer]

No cleaning it up. I have tried before on very similar conditions. About the time it starts to look good you are through the plating.

 

[Likesaws]

Going to see what happens. Going on a parts saw that had a bad top end.
Won't spend to much time on it though.
Any other opinions welcome.
Thanks

 

[huskihl]

Slide a piston up in it and feel for anything hanging it up. Nothing you can do about the lines up high. They'll cost you 5-10 psi in compression.
Make sure nothing protrudes into the bore in that spot under the exhaust and it'll probably last a long while

 

[Likesaws]

Slide a piston up in it and feel for anything hanging it up. Nothing you can do about the lines up high. They'll cost you 5-10 psi in compression.
Make sure nothing protrudes into the bore in that spot under the exhaust and il probably last a long while

Feels smooth by touch, will slide piston in without rings first see if it catches anything.

 

[Wagnerwerks]

I have a 346 with similar grooves. It has 4 seasons of firewood on it with a hyway piston kit. Runs great.

 

[huskihl]

Feels smooth by touch, will slide piston in without rings first see if it catches anything.

Could also stick a ring in there and push it up slowly across that area and feel for it. Ring is tighter to the wall than the piston

 

[Likesaws]

Could also stick a ring in there and push it up slowly across that area and feel for it. Ring is tighter to the wall than the piston

I'll do that too.

 

[big t double]

Use stihl ultra. The carbon it produces will fill the gouges in.

 

[drf256]

Make sure those grooves on top don't have any ridges coming out. They probably do on both sides.

Take a small diamond ball and run the length of them.

Then polish the entire cylinder with a brake home and then scotchbrite.

You'll never make a silk purse outa that sows ear, but you'd be suprised at what will run and still make good compression.

On this jug, with the permission of the new owner, I smoothed the damage (groove) with a diamond ball. The darn thing makes the same compression it did before the damage.

 

[Wagnerwerks]

That doesn't look much different than the old McCulloch jugs with the v cut in the port.

 

[Likesaws]

Use stihl ultra. The carbon it produces will fill the gouges in.

Thought about 32-1

Make sure those grooves on top don't have any ridges coming out. They probably do on both sides.

Take a small diamond ball and run the length of them.

Then polish the entire cylinder with a brake home and then scotchbrite.

You'll never make a silk purse outa that sows ear, but you'd be suprised at what will run and still make good compression.
View attachment 56634
On this jug, with the permission of the new owner, I smoothed the damage (groove) with a diamond ball. The darn thing makes the same compression it did before the damage.

Will clean it up good see what happens
Thanks