McCulloch Chain Saws

[gyula91]

Hello!
As I mentioned I am a beginner in the mcculloch chainsaw world.
My 6-10 has a 9,5bar compression. Is it normal? Or do i have to dig in it and change the rings?
It needs a carb adjustment/rebuild. It is a hard starter now and it seem it is runnig out of fuel after some minutes.
I plan to open the low jet first. Do I have a good plan?

 

[vinnywv]

Yep id say you have a runner. You are pushing 140 psi which is good. Get that carb figured out and run it. Im sure you will get other opinions. Just ask what the best oil and mix ratio is...lol

As for the carburetor, close both jets off to seat lightly, not too tight as they could do damage, and then open up one full turn. Go from there. I find some carbs like a bit more openeing on low side. Some like less.. the high side i generally end up closing off a bit from one full turn. Not much but a little more closed.

 

[edju1958]

I got the Jenn Feng MS1635 today & it's dead,no spark.The saw looks like brand new,I'd say less than a cord of wood through it.As for the Jenn Feng saws being a vertical cylinder saw,well that's a myth.This saw is a horizontal cylinder saw.It has a tag on it that says McCulloch,Tuscon,Az.,but on the same tag it says "made in Taiwan".It had a Jenn Feng spark plug in it,I changed that out thinking it might be the problem,but it wasn't.Now I'll pull it down one day after I've cooled off a bit to see if it uses the same electronic ignition that the 32/35/38 cc saws did.

 

[gyula91]

Yep id say you have a runner. You are pushing 140 psi which is good. Get that carb figured out and run it. Im sure you will get other opinions. Just ask what the best oil and mix ratio is...lol

As for the carburetor, close both jets off to seat lightly, not too tight as they could do damage, and then open up one full turn. Go from there. I find some carbs like a bit more openeing on low side. Some like less.. the high side i generally end up closing off a bit from one full turn. Not much but a little more closed.

Thx
I did exactly this yesterday. Now I have good idle and throttle response. It needed just a little shy of 1 turn on low jet. And little over 1 turn on high jet

I know the oil mix ratio argument well lol

 

[heimannm]

Ed - Jenn Feng continued to produce the 32/35/38 version of the McCulloch design as they were in the process of changing their models to the vertical cylinder concept. The electronic ignition coil will be the same as the other 32/35/38 cc models.

Mark

 

[edju1958]

I bought a pair of Mac 16 in.bars that I thought were 3/8 p[itch.I had one on my Super 10-10 a couple weeks ago & couldn't figurer out why the chain wasn't fitting right in the sprocket tip.I changed out the bar & put a known Oregon 3/8 pitch bar on & had no more problems.It dawned on me that the bar might be a .325 pitch bar,not a 3/8 pitch,but I didn't have any .325 pitch chains to check out my theory,or so I thought.Today I found a Husky 33 chain that's a .325 pitch that a former tenant had left behind.I put that chain on the bar & it fit perfectly in the sprocket tip.The tip has 3 rivets holding the tip on.I thought of removing the tip & putting a 3/8 tip on,but the 3/8 tip has only one rivet.Will that work or not?
The other option is to keep it at .325 pitch & change the rim drive on the saw to a .325.The question here is did anyone make a .325 rim for the 10 series?

 

[vinnywv]

Ed, my 6-10 has .325 pitch chain on it. I also have a rim drive on that saw. So yes a rim drive does fit. Its an oregon rim drive for the small spline mac drum. Mac used a large spline and smaller spline drum. I believe the 600 series was the smaller spline size. So yep yu can do it.

 

[edju1958]

Ed, my 6-10 has .325 pitch chain on it. I also have a rim drive on that saw. So yes a rim drive does fit. Its an oregon rim drive for the small spline mac drum. Mac used a large spline and smaller spline drum. I believe the 600 series was the smaller spline size. So yep yu can do it.

I kinda had you in mind Vinny with your 6-10 as I thought you had a .325 pitch on it.I do have a couple drums for the 600 series,but now finding the .325 pitch rim is the next step.I'll also have to pick up some smaller files now too.

 

[heimannm]

I'll confirm what Vinny has posted, the clutch drums for the 600 Series saws have the small spline, and .325 7 and/or 8 tooth rim sprockets are readily available. You can even find 9 tooth .325 sprockets in the large spline if you want to keep the chain speed up.

Mark

 

[Jethro 2t sniffer]

Hey Mark reckon you could 3d print a 1/10 scale 10 series??

 

[j-jock]

Im guessing from the all yellow and no "C" on the nameplate it is an earlier model with a sleeve rather than the chrome bore (125C). Just in case...I have some 85542 0.030 over pistons for those models.

Mark

Mark, I am too tired and lazy to do the math right now, but do you mean .030 inch over? I am amazed that you can bore the cylinder out that much, or would the person have to purchase an over sized cylinder? From your statement, I am assuming that the chrome bore can't be machined for these pistons.
The reason I am asking this, is that .030 overbore in a 300 cubic inch engine, works out to approximately 7 cubic inches. From my racing days, when we were looking for every little bit of horsepower in an engine, that amounted to a real performance advantage.

 

[mbellot]

Hey Mark reckon you could 3d print a 1/10 scale 10 series??

Do you have a 3d model of one?

 

[Jethro 2t sniffer]

Do you have a 3d model of one?

No I wish that's the hard part

 

[heimannm]

The challenge for me is that I do not make the drawings so I have to pay someone to create the 3D drawing (.STL file) that I can use with my printer. If anyone out there has some CAD skills and would care to take the challenge to make a drawing, I could certainly get them printed.

Mark

 

[heimannm]

j-jock - yes, 0.030" overize. The steel or cast iron sleeves in the saws would easily accomodate the 0.030 overize pistons. I am told on the kart engines that some were bored 0.100" oversize or even a bit more. The sleeves start to get pretty thin at that point. McCulloch emphasized their ability to bore oversize and keep the saws running...until chrome plating took over.



Mark

 

[edju1958]

What's the difference in filing a full chisel chain as opposed to filing a semi chisel chain?

I was out cutting yesterday with my son.He was using my PM55 to fell some ash trees & the chain suddenly bound up really tight.He loosened it up & went back to cutting & it happened again.I'm guessing the clutch bearing went bad.I don't have time to tear it apart right now to see what's going on,possibly over the weekend.I'll take the 555 out today & use that if needed.Ended up dropping 6 small ash trees about 18 in.in diameter.

 

[heimannm]

I normally use a top plate angle of 25° for chisel and 30° for semi chisel. Some promote using a 10° "up" angle on the chisel chain and some chain vises on grinders are adjustable so you can achieve that affect. I tend to keep the file/vise horizontal for both chisel and semi chisel chain.

You can adjust the angles on your chains according to your conditions and needs. A shallower angle (20° vs 25°) would produce an edge that does not cut quite as fast but would hold up longer, etc. etc. I know some of the McCulloch supplied file plates had 35° and 40° angles on them for some of their semi chisel chains. I also have some of the flat type file guides with 22° and 30° lines scribed.






Remember that anything you do to make it cut faster will ultimately result in the chain dulling faster as well.

Check the drive sprocket and the oiler on the PM55, sounds like something is amiss there Ed.

Mark

 

[Squareground3691]

I normally use a top plate angle of 25° for chisel and 30° for semi chisel. Some promote using a 10° "up" angle on the chisel chain and some chain vises on grinders are adjustable so you can achieve that affect. I tend to keep the file/vise horizontal for both chisel and semi chisel chain.

You can adjust the angles on your chains according to your conditions and needs. A shallower angle (20° vs 25°) would produce an edge that does not cut quite as fast but would hold up longer, etc. etc. I know some of the McCulloch supplied file plates had 35° and 40° angles on them for some of their semi chisel chains. I also have some of the flat type file guides with 22° and 30° lines scribed.

View attachment 1076788

View attachment 1076789


Remember that anything you do to make it cut faster will ultimately result in the chain dulling faster as well.

Check the drive sprocket and the oiler on the PM55, sounds like something is amiss there Ed.

Mark

I use Carlton File o plates , they look exactly the same ,

 

[Jethro 2t sniffer]

A Mac version of this.

How good do those 3d scanners work I wonder.

Also to go on this...
I have the stihl 1 floating around but its just not the same. I'd be happy with a husky but me n stihl are not friends lol.

Vinny sent me a 610 on a random Christmas decoration that's perfect for my smaller scale truck. I found yesterday while shifting. My boy pushed the button on the thing a million times.

 

[Syncop8r]

A Mac version of this. View attachment 1076903

How good do those 3d scanners work I wonder.

Also to go on this... View attachment 1076911View attachment 1076908
I have the stihl 1 floating around but its just not the same. I'd be happy with a husky but me n stihl are not friends lol.

Vinny sent me a 610 on a random Christmas decoration that's perfect for my smaller scale truck. I found yesterday while shifting. My boy pushed the button on the thing a million times.

Oh .. not for earrings then?