Stihl 1106 thread (contra, 070 & 090)

[Eddy_t]

After much information gathering over a few years, I thought I'd start a thread covering the differences between the models of these saws, which I will update as I go along.

 

Recently I've been working on an 090 for a friend (and fellow arbtalk member), and despite being the same series of saw, the differences are immense, so telling when the saw was made, or as what saw originally is very difficult.

 

I'll start with the clutch cover, the later model has Stihl cast into it, and the metal deflector plate on the opposite side is fixed on with 2 studs, where as the earlier (mine) isn't. There are a few other clutch covers, some have an additional ejection hole for chip, some have a location for a handle (early wrap design).

 

The contra has a much longer HT lead and smaller plug boot than the 090, this is because it originally mounted at an angle into the cylinder, whereas the specific 070/090 looks more like a pipe. There are only 2 boots, but colour of the HT lead varies, I have seen white, grey, black, green and red.

 

The most obvious difference between each model is the starter assembly. The first is a 1st generation Fairbanks-morse, whilst the other is a later, 3rd, with the Stihl logo attached (2nd gen has the logo cast into the block, fourth can be found on eBay, with the orange Stihl badge)

 

The on/off switch also varies, the earlier version is longer and has a simple I/O marker, whilst later versions have on/off in English and German. Some also have a rubberised cover.

 

I'll finish this post with a very important difference, the earlier model has a bolt that can be removed to drain the crankcase, or for a piston stop, whereas the later model has had it blanked off, this was a mid 70's change. Prior to 1967, the casing came in 2 sizes, super and standard. The super case will accept both the 58 and 66mm cylinder, whilst standard will only accept 58mm. The newest version (current) has neither of these, and the casing is much different.

[Eddy_t]

Next ill cover the AV handles.

The older type AV has the bar that goes over the top of the saw. It has a more up-right rear handle, which I find is more uncomfortable. This version was also available with an additional wrap version. The front left mounts in two places, the usual mount point, and an additional point on the lower pull-start for stability. Front right is mounted to a post, which attaches to the AV rubber's threaded bars. This is where the top of the wrap also attached. The rear handle attaches right at the back.

 

The new type AV requires the modern casing, or a bracket to be made.

The new type rail passes around the side of the saw, mounts higher up on the left, further forward on the rear handle (which is wider and more horizontal) and has a specially designed bracket on the front right.

 

This unfortunately means that the AV units are not interchangeable, but throttle linkage, earth wire and the carburettor linkages are!

[Eddy_t]

These are a few forms of the AV wrap that were available, the first being one that could be fitted to the standard av handle.

Whilst this is the first type of wrap handle that I mentioned in the first post.

Next, I'll move onto clutches, the first 090's were fitted with a beefed up version of the contra/070 clutch (along with the contra S), whereas later models were fitted with the 6 shoe, gear-drive clutch.

The 6 shoe clutch engages at 100rpm less than the 3 shoe version, I have an 070 clutch fitted to mine, as you can fit a rim sprocket, unlike the 090 drum (although I have seen one rim drum on eBay). Anyone restoring the clutch should assess whether it's cost or originality you're opting for, the 070 clutch costs £30-40, but the 090 clutch is in excess of £150!

 

The earliest models of the 1106 series didn't come with a manual oiler, and in the first photo, the oil windows begin with p/n 1108 which refers to the Stihl S-10/08/08S series of saws, despite not having the oil window on any model. The true 1106 windows have a 2-pronged tool to remove them, whilst the 1108 window has a hexagonal block for a wrench.

 

Most saws can be dated from the muffler, mine was dated 1969, the 090 rob dyer had was 1982. But as I have said before, random parts got fitted to different saws in no particular order, the one I'm working on came with an early sand-cast muffler with no date upon it.

As you can see, it has a much rougher surface than the contra muffler I have.

[tnslabber]

Thanks Eddie t for all the great info. I just picked up an 070 to use for milling and stumping. The 87 year old I got it from just had occasional use for so decided he'd part with it. He said he bought the first one out. I thought it was just a figure of speech but maybe not. I looked on the muffler as you suggested and it was stamped 67. I see quite a few guys putting bigger cylinders on the 070's do you know if this model will accommodate one? Do you know the first year of production? I thought it was 68?thanks again

[NFG]

Thanks Eddy for posting those pics,

 

We found an 07s in a skip recently the plug gap was nearly closed but after adjusting & some fresh fuel it started third pull!

 

 

N

[wisecobandit]

I will try get some pics of the 090 I built up/restored. Bit of a mash up of bits tho it looks quite nice and new but needs a longer bar!.

Only pic I think I have of it is when wickamulla came out on a bit of a play day so its him in the pic not me (thankfully)

[Eddy_t]

Thanks Eddie t for all the great info. I just picked up an 070 to use for milling and stumping. The 87 year old I got it from just had occasional use for so decided he'd part with it. He said he bought the first one out. I thought it was just a figure of speech but maybe not. I looked on the muffler as you suggested and it was stamped 67. I see quite a few guys putting bigger cylinders on the 070's do you know if this model will accommodate one? Do you know the first year of production? I thought it was 68?thanks again

 

 

1959 was the first year of production for the Stihl contra, 1970 was the first year of the 070/090, you probably have a converted model, same as mine. I would need photos of the front of the crankcase and starter to tell you if you have a later casing, although if you look inside the flywheel area, there should be a part number, 1106 020 2540 is the super crankcase that the 090 fits

[agg221]

Thanks Eddie, useful info. I will eventually get round to looking at mine in detail.

 

One thing that may be useful - Oregon used to make rim sprockets for the 090 which fit the 6 shoe clutch, but discontinued them. They have been copied in Australia and I imported a box full so if you need one give me a shout.

 

Alec

Edited October 18, 2015 by agg221

[Tradewynds]

Hello I am new to the site, from across the pond in Canada and have been rebuilding these saws for awhile now. Just recently picked up these four beauties to start to restore.

 

Having one heck of a time finding (non-knock off) parts, too many pieces of junk out there.

 

Wish i could head over to Germany for one week and a large seacan, man would i fill it up

[Eddy_t]

Hello I am new to the site, from across the pond in Canada and have been rebuilding these saws for awhile now. Just recently picked up these four beauties to start to restore.

 

 

 

Having one heck of a time finding (non-knock off) parts, too many pieces of junk out there.

 

 

 

Wish i could head over to Germany for one week and a large seacan, man would i fill it up

 

 

Hi, welcome to the forum, lovely 090G, wrap handles and bow saw bar you have there. I'd love to get my hands on an 090G, I already have the guide bar!