McCulloch Chain Saws

[Goinwheelin]

Got the 1-70 out this afternoon. No cutting with it just warm it up and burn some fuel thru it for now.

 

[vinnywv]

Today worked out well for the cold weather. Yesterday i got a box of parts from bob johnson!!!!!!
Today i got the sp70 together and fired it up. Turned out very good. There were a lot of small screws missing or stripped. But sorting thru my peanut can of screws i had enough to get it together. It now wears a 24" bar and runs like a new saw. It should though. I was surprised. The new piston that bob sent was from lil red barn?? So i had to reuse the wrist pin. But it is a great runner. I made a few cuts and im very happy with it.
Then i moved on to the 6-10a, after some tinkering, i got a new piston in it. With a much better ring gap than what was in it. Its a great runner and fired right up no issues. I likely could have not replaced its piston but i had a new one and it was going to good useage.
Its a shame that mac didnt survive, or that they werent copied. Wonderful machines that continue to impress.

 

[Jethro 2t sniffer]

Welcome to the club Homie I’m happy for you.

Thanks man wasn't as crazy cheap as yours unfortunately but all good I'm happy. And thanks was allready a 82cc member but not the old type.

I like the 850 shroud setup. A dam fine saw.

The AV mount at the front fell apart when I pulled it out today 1 side fell off the other almost did. I've cut some rubber I've drilled some holes and hopefully at smoko I'll get it together and see how it goes.

It will be stiffer than original but doesn't worry me at all. The rear is much better and hopefully this up front will help take care of the rear.

Something I've noticed the 850 mounts have a hole through the rubber the 800 are solid rubber and probably a bit stiffer from new.

Also the rear mount on the end of the handle to the boot strap is also alot smaller and harder than the 850

 

[Jethro 2t sniffer]

Today worked out well for the cold weather. Yesterday i got a box of parts from bob johnson!!!!!!
Today i got the sp70 together and fired it up. Turned out very good. There were a lot of small screws missing or stripped. But sorting thru my peanut can of screws i had enough to get it together. It now wears a 24" bar and runs like a new saw. It should though. I was surprised. The new piston that bob sent was from lil red barn?? So i had to reuse the wrist pin. But it is a great runner. I made a few cuts and im very happy with it.
Then i moved on to the 6-10a, after some tinkering, i got a new piston in it. With a much better ring gap than what was in it. Its a great runner and fired right up no issues. I likely could have not replaced its piston but i had a new one and it was going to good useage.
Its a shame that mac didnt survive, or that they werent copied. Wonderful machines that continue to impress.

Good job Vinny how do ya like that red barn piston?

Could ya throw the old 1 into the 7-10 from hell? Just for proof of concept

 

[rwoods]

Jethro,

MAC used to market a long bar kit for the 850. It was primarily A/V mounts without the holes. At some point the solid mounts became standard.

Ron

 

[Jethro 2t sniffer]

Jethro,

MAC used to market a long bar kit for the 850. It was primarily A/V mounts without the holes. At some point the solid mounts became standard.

Ron

Thank you Ron I love these little bits of information.

I'm determined to make my own haha hate buying stuff I don't need to there expensive in nz pesos

 

[vinnywv]

Good job Vinny how do ya like that red barn piston?

Well, so far ive had good luck with them. Theres been one in my first mac saw from day one. I put one of them into my sp81. Its been thru many tanks of fuel in the few years ive had it. The wrist pins are the issue. They are not the proper size and you must reuse the originals. Not a big deal. Its out anyway, not like its extra work. But its lasted this long. I am not concerned about it.

 

[vinnywv]

That posted weird, my response is in your quote? Lol

 

[Jethro 2t sniffer]

Haha is too. If you go back into it and delete the quote then quote it again it will come right.

Good to hear the LRBs are doing ok

 

[kbeck]

Just too be clear with the factory disassembly, was the short skirt on the exhaust side?

On my Pro Mac 60 I was told by manufacture short skirt exhaust side

 

[heimannm]

We had a visitor dropping this thread a while back that installed a LRB piston in an 800 or 850, he couldn't figure out why the wrist pin kept sliding over...not sure if we finally convinced him he had to use the original to properly fit the bore of the rod.

Mark

 

[2broke2ride]

We had a visitor dropping this thread a while back that installed a LRB piston in an 800 or 850, he couldn't figure out why the wrist pin kept sliding over...not sure if we finally convinced him he had to use the original to properly fit the bore of the rod.

Mark

I remember that, didnt he eventually tear up the cylinder pretty bad?

 

[2broke2ride]

Looks like you got a good engine there Kevin

I think so, some rings and gaskets and I will be in business.

 

[2broke2ride]

I was taught years ago to "crosshatch" a piston much like honing a cylinder to help with oil retention. Is there any harm..... or good in doing this as far as you guys are concened?

 

[Jethro 2t sniffer]

Not sure I would bother to be honest.

Got my AV mount sorted

 

[Jethro 2t sniffer]

And here she is with her new friends

 

[vinnywv]

Not sure I would bother to be honest.

Got my AV mount sortedView attachment 798767

Where theres a will theres a way.
The saws all together looks great.

 

[heimannm]

It was/is a common practice to hone or otherwise deglaze an iron bore cylinder, not recommended for a chrome bore.

Mark

 

[kbeck]

I was taught years ago to "crosshatch" a piston much like honing a cylinder to help with oil retention. Is there any harm..... or good in doing this as far as you guys are concened?

Iv'e seen that done to old snowmobile pistons, here's another take on that concept this piston was in a 1969/70 race motor.
Nice group of yellow you have there Jethro/like the antivibe fix

 

[2broke2ride]

It was/is a common practice to hone or otherwise deglaze an iron bore cylinder, not recommended for a chrome bore.

Mark

I agree 100% Mark, I was talking about the piston itself.
I was taught in tech school to take some scotchbrite or fine sandpaper and actually crosshatch the piston itself to help with oil retention.