Christmas Exchange Echo 620

[mdavlee]

Let me back up a bit, I'll tell a funny on my self.

I had the clutch off mounting the degree wheel, putting the saw back together, I generally give the clutch a small blip with the impact. I did it this time by hang.

Fired the saw up, kicked it off fast idle, listened at it for a moment, gave the throttle a few rasps and the clutch flies off!!!! It shoots across the floor, bounces off a tool box 10 feet away, heads straight back at me and tries to climb my leg. I'm squirming but now where to go.

Status update: clutch in pieces and bearing is missing in action.

Results: ordered new Oregon drum kit and clutch. $60 spent in matter of moment.

I had to laugh a little since I may or may not have had that happen before[emoji9]

 

[Stihlbro]

The 357 is sporting a meteor piston, I've had this saw apart several times.


Notice the distinct circle in the pattern of the piston top. Ironically it is exactly where machining the squish band stops. I set squish at .025 and maybe 2 tanks of fuel thru it at thesis point. Guess what squish measures now? Yes the carbon build up tightened things up.

I have the saw apart checking port bevels or any irregularities. I've learned the eye can not see what is going on a 14k rpm.

 

[mdavlee]

The 357 is sporting a meteor piston, I've had this saw apart several times.
View attachment 46181

Notice the distinct circle in the pattern of the piston top. Ironically it is exactly where machining the squish band stops. I set squish at .025 and maybe 2 tanks of fuel thru it at thesis point. Guess what squish measures now? Yes the carbon build up tightened things up.

I have the saw apart checking port bevels or any irregularities. I've learned the eye can not see what is going on a 14k rpm.

.018?

 

[Stihlbro]

.018?

Lol! Did you have second thoughts?

 

[mdavlee]

Lol! Did you have second thoughts?

Fat finger on the keyboard.

 

[Stihlbro]

I'm struggling with the timeline of my photos with the 357. It's all good!!!!

 

[mdavlee]

I'm struggling with the timeline of my photos with the 357. It's all good!!!!

I'm sitting here with the little one. She's got a fever again and wants to be held. I've got to get up soon and make pies.

 

[Stihlbro]

I try my best to take good notes, measure thing up, take pictures and study what I'm finding.



I've always used the degree wheel to measure port openings, since I've known @David Young , I have been measuring with a calipers and using torquesoft to double check my findings.

All I can say is, it is amazing the difference you see. Some I agree with, some I still scratch my head.

 

[Stihlbro]

Here the 357 was getting a work out. Just some good old firewood. The 026 was there as back up, but was not needed.

 

[jmssaws]

I try my best to take good notes, measure thing up, take pictures and study what I'm finding.

View attachment 46185

I've always used the degree wheel to measure port openings, since I've known @David Young , I have been measuring with a calipers and using torquesoft to double check my findings.

All I can say is, it is amazing the difference you see. Some I agree with, some I still scratch my head.

I have boxes of poorly written and confusing notes.
I have a hard time stopping and writing stuff down,I always get timing numbers down but I'll forget to write down how far the ignition is advanced and how much was cut from the chamber and base.

After a while all of the saws and numbers run together so notes are very important
Especially when something goes wrong.

 

[Stihlbro]

I date them, scribble, change pens, talk to my buddies about them and go back and check as a reference.

I use to write on the cylinders with a permanent marker to keep track.

I constantly take picture on my phone and zoom in to check port shapes and finishes.

 

[Stihlbro]

First picture was 10/18 this is 12/11. I also compared it to a 359. Final on the 14th. This book has every saw I've modified/took apart/ durations/ carb specs. I also port map.

 

[jmssaws]

I'm sitting here with the little one. She's got a fever again and wants to be held. I've got to get up soon and make pies.

I have a fever and want to be held also Mike.
I got a 084 I'm wanting to finish but the Buzzards are circling me.

 

[mdavlee]

I have a fever and want to be held also Mike.
I got a 084 I'm wanting to finish but the Buzzards are circling me.

One dose of tylenol and some food and she's running wild now

 

[jmssaws]

One dose of tylenol and some food and she's running wild now

Good deal.
Nothing worse than a sick baby girl
It's been a very long time since I've had a baby girl but I still remember.

Hope she stays better

 

[huskihl]

View attachment 46202

First picture was 10/18 this is 12/11. I also compared it to a 359. Final on the 14th. This book has every saw I've modified/took apart/ durations/ carb specs. I also port map.

How do you get your girl to take notes for you? She has great penmanship

 

[Stihlbro]

How do you get your girl to take notes for you? She has great penmanship

Lol! I have notes all the garage saying" Jaela was here."

 

[paragonbuilder]

I've always used the degree wheel to measure port openings, since I've known @David Young , I have been measuring with a calipers and using torquesoft to double check my findings.

All I can say is, it is amazing the difference you see. Some I agree with, some I still scratch my head.

What kind of differences are you seeing Joey?

 

[Stihlbro]

What kind of differences are you seeing Joey?

Glad you asked. I've been off by 3 degrees or close as 1/2 a degree. And this is why I put this out, I try to be consistence as possible, like same method to read openings. Grant it I'm looking thru a plug hole and have to use the same light and hold my head the same. Transfers are tough sometimes.

I've degreed a saw and had my brother do it and we get different readings. I've done it with @wigglesworth and we are different. I always second guess myself and keep rechecking.

 

[paragonbuilder]

Glad you asked. I've been off by 3 degrees or close as 1/2 a degree. And this is why I put this out, I try to be consistence as possible, like same method to read openings. Grant it I'm looking thru a plug hole and have to use the same light and hold my head the same. Transfers are tough sometimes.

I've degreed a saw and had my brother do it and we get different readings. I've done it with @wigglesworth and we are different. I always second guess myself and keep rechecking.

So as long as you have the correct squish measurement, rod length, stroke, and do the math right, lol, do you think that the calculation method is more accurate?