Stihl 064 Cylinder Chrome

[Trigger-Time]

Bought a used 064 cylinder on e-bay, it had not been honed,
Cleaned it up, it was bad. Called seller, said he would send another
one right out (which he did) it looks very nice........But the chrome
is chipped above exhaust port.
Will it hurt anything?
Can it be fixed?
Or is it junk?

 

[Dan Forsh]

I don't know the answer to your question, but that is some fine photography.

Dan

 

[ericjeeper]

I think it can be saved

take a very fine stone and relieve it back a bit. Or see if he has another. I am no expert.what does it measure? .075? or less?

 

[vegaome]

+ 1 on the photography, nice job.

Howdy Triggertime,

I'm no expert either but I was thinking if that critter is stock maybe you could.......open her up a bit. Just a thought. Good luck


v/r

Mike

 

[Trigger-Time]

what does it measure? .075? or less?

About 7/16 or 11mm

 

[ericjeeper]

Oh but if it is not flaking loose

That is far more than I was thinking. Lake might chime in..Count me out of this one. LOL

 

[Trigger-Time]

That is far more than I was thinking. Lake might chime in..Count me out of this one. LOL

I'm sorry my mistake, I was thinking wide. Its about .030 tall

 

[Lakeside53]

What am I looking at.. ? That doesn't look like any exhaust port I've seen on an 064...

General comment... releaving the sharp edge is a must, BUT be careful on the top edge as you'll loose compression as you raise the port..

 

[RiverRat2]

Nikasil cutter and a carbide cutter

I'm sorry my mistake, I was thinking wide. Its about .030 tall

Trigger I'm thinking you should be ok just go slow with the carbide with the cutter working into the port (Pulling toward the muffler) until you get back to the plating then nikasil cutter to rechampher the edge but dont remove anymore than necessarry,,, looks like some one has been there before............

 

[Trigger-Time]

Another pic................ Can take more if needed

 

[Lakeside53]

I see... it's the shot angle...

If you're going to keep it... Just very gently grind (fine stone) the NIkersil egde - just feather it - and don't remove anything beyond what you need to.. you sure don't want to raise you port 30 thou..


Hovwever:

Did you already try to grind it? Can I see a witness mark from an old attempt?. If it's already been done, you really don't know how much etc has been taken off. If a prior owner ported the exhaust even slightly, with a carbide burr, the nikersil could have been chipped.

 

[RiverRat2]

Agreed Lakester

I see... it's the shot angle...

If you're going to keep it... Just very gently grind (fine stone) the NIkersil egde - just feather it - and don't remove anything beyond what you need to..


Hovwever:

Did you already try to grind it? Can I see a witness mark from an old attempt?. If it's already been done, you really don't know how much etc has been taken off. If a prior owner ported the exhaust even slightly, with a carbide burr, the nikersil could have been chipped.

Looks like he didnt pay attention to wich way the carbide cutter was
turning if it turns into the cylinder bore it will peel it everytime,,,, if it ttuns away from the bore into the exit (toward muffler) it usually won't peel,,,, Errr ahhhhhemmmm BT,,,DT,,,,, the best tool to use at the bore port interface is without a doubt the nikasil cutter,,,, Great pix and thread BTW timber keep em coming

 

[Lakeside53]

Yep.. most guys don't have a right angle grinder that can get in the correct way... Best to use a stone if coming in from the exhaust side.

Not sure I'd want an "unknown" ported cylinder.. unless it was really cheap!

 

[bama]

I don't mean to hijack the thread, but I have a 621 jug that is great except for a piece of nikasil came off below the intake port(about the same size as the 064 cylinder). Since the rings don't go that low, it should still be ok, right?

 

[Lakeside53]

Depends... your piston skirt still touches the bore... and the chrome edge is a great cutter! Best gauge is to look at the piston that came out of it and see what the wear pattern looks like.

 

[RiverRat2]

That lake he don't miss!!!!!!!!!!

Depends... your piston skirt still touches the bore... and the chrome edge is a great cutter! Best gauge is to look at the piston that came out of it and see what the wear pattern looks like.

There will probably be a tell tale mark on the skirt, but if its been running you may take some fine Krocus cloth and polish the bottom of the skirt in line with the target area and you might skate beings it is below ans if the plating it is still bonded around the anomoly,,,,,,,,,,,seen wierder stuff come out of perfectly good running saws,,,,I just have aproblem sometimes puttong stuff back together especially if I had to buy other parts with my hard earned ca$h and takin the chance...........Good hijack BTW...............

You go Andy!!!!!!!!!!!!!!!!!!!!

 

[Trigger-Time]

Did you already try to grind it? Can I see a witness mark from an old attempt?. If it's already been done, you really don't know how much etc has been taken off. If a prior owner ported the exhaust even slightly, with a carbide burr, the nikersil could have been chipped.

No! I have not touched it. Thats why the carbon is still in the port
If I had :monkey: with it, I would have cleaned the carbon off first.

I think I will call the guy tonight, tell him to look at the pics and see
what he thinks. If he has'nt seen them already.

 

[bama]

Depends... your piston skirt still touches the bore... and the chrome edge is a great cutter! Best gauge is to look at the piston that came out of it and see what the wear pattern looks like.

Here's what happened. I pulled the jug off this saw which had a main bearing failure. The cage came apart and a piece went up on top of the piston through the transfers. When I was pulling the jug off, the piece lodged at the bottom of the intake(between the piston and the intake), only I didn't realize it. It was a bugger to get off and when I did, I noticed the piece of nikasil was missing.

The owner of the saw must have shut that saw off mighty quick because there was no scoring on the piston or cylinder, but now there is that chip. The pison wouldn't show wear there since it wasn't there when the saw was running.

Maybe I will try to dress up one of my poorer pistons and see what it does after running it a bit. That way I will learn something and it won't cost me anything. It may not run well with a scored piston, but I could get an idea if the chip will rub on the piston. What do you think?

 

[timberwolf]

I have had good luck with both fine stones and diamonds where dealing with the port edges, carbide and plating can go bad fast.

 

[klickitatsacket]

well guys I am feeling a bit sheepish on this one. That cylinder came out of my shop and I dropped the ball twice. Originally he purchased a cylinder off of ebay and it was suppose to go out honed and ready for instalation. When he got it; it was not honed and he honed it himself. When he did scratches appeared and he gave me a call. I had the guys find another cylinder and hone it and mail it out. In my hurry to get this right to him I did not inspect it as closely as I should have. I did not see the chips on the exhaust port. If I had I would have gently stoned the edges. I have made arrangements with triggertime to compensate him for the hassel. Triggertime had already told me that he was not going to put my name on here but because this was my problem I figured I would post the whole thing.

The cylinder was honed with ball hone and usually you do not see chipping like this around the ports. IF anything you will usually see feathered edges if you go long enough.

Mistakes do get made from time to time no matter how hard we try to keep them from happening. When these do; I try my best to fix them and move on. My goal is to keep people happy in spite of them if I can. this does not always happen, but I will still try if I can.