Stihl 045 info

[Lawn Masters]

Since Mike acres seems to be having trouble with his site, I need some specs on Stihl's 045 model saw. What is the actual displacement,HP, CID, weight with a 20" bar and how reliable they are.

 

[cbfarmall]

They came in 3 displacements. The oldest are 75cc 9 (4.6ci); later they were 81cc (5.0). 045 Supers were 87cc (5.3ci). I imagine some people have put the 056 Mag jug on 045 cases and that'll give 94cc. HP stuff I can't help you with.

The old literature I have for the 75cc 045 lists the weight w/ 14" bar @ 18.5lbs. Considering the absurdity of putting a 14" bar on an 045 I don't why they would list that figure.

As for reliability, I absolutely love the saw. That's why I have four It's an older, heavier one to be sure. But one of the best of it's time. When I go to Arkansas to move a friend and cut up some trees I'm bringing my 066 and my 045 Super.

The only problem is that some parts are hard to find. Particularly, pistons, older ignitions, and clutch side bearing. Those, at least, are the ones I've looked for. Luckily the saws are durable enough.

Are you looking at one to buy?

Chris B.

 

[Lawn Masters]

As a matter of fact I am, the owner is hanging around up north, I've purchased 3 other saws from him, and all 3 run fine, and came to me just as he said they would.

Its good to know that the 045 has a good record. Just might buy it now that I've got more information on it.

 

[cbfarmall]

Search for it on this forum. It's been brought up enough times.

Chris .

 

[Big feller]

If my old spring balance is still reliable, my 045AV with a 20 inch bar weighs in at about 22 pounds with the gas tank about quarter full and next to no oil.

I found a power figure of 3.7KW for the 81cc model - bore and stroke 52 x 38mm.

As for reliability, I am yet to find out. Mine can be relied on not to work at the moment (bought as non-runner) but I have had some really useful help on this forum and I hope to have it eating trees soon.

If buying another I would check the casing - mine was horribly corroded - and the bonded rubber mountings.

Good luck with the saw.

Dave

 

[Lawn Masters]

I've seen the saw itself, the whole thing is in pretty good shape, I cant tell which one of the 3 displacments it is, but I'll find out soon enough. The saw sees use fairly frequently so its not likely to be corroded or anything like that. Where would I look though for those rubber mountings, should they need to be replaced?

 

[cbfarmall]

75cc is 50mm, 81cc is 52mm, 87cc is 54mm, 94cc is 56mm bore. All have 38mm stroke. You can still get the rubber from Stihl.

Chris B.

 

[Big feller]

Strange that the same model number should have so many different capacities. Can the smaller ones be bored out when they become FUBAR? - probably a dopey question - I am new to 2 stroke repairs. I don't see any reference to oversize pistons; I just wonder what the options are now that the original parts are hard to source.

 

[rmihalek]

I think that boring the cylinders out 2mm to step up to the next size piston would be too much. The port timing would change since the ports do not enter the cylinder at a 90 degree angle and also the cylinder walls may end up too thin.

 

[cbfarmall]

The 94cc displacement is actually for an 056 Mag which has a larger bolt pattern as a result of the large bore. The jug can be machined to fit the smaller case of the 045 and 056 and the piston pin bearing is the same. Dozer Dan knows more about it.

And I find it interesting that so many displacements were available for this engine. Probably not many others out there like it.

Even if you could bore out a jug, you'll have a hard time getting new pistons. NLA from Stihl. Don't know about the 56mm one though.

Chris B.

 

[Lawn Masters]

Originally posted by cbfarmall



Even if you could bore out a jug, you'll have a hard time getting new pistons. NLA from Stihl. Don't know about the 56mm one though.

I'd just buy the larger cylinder, boring out a smaller bore jug to get a larger piston in there is just not worth it to me, you would have to have tools I dont have and dont know how to use, then ater re-boring the jug, you have to re chrome or re line it with that nikasil or whatever it is, and that in itself I would imagine is pretty expensive. I dont know much about the tools or resources involved in boring out a cylinder, but I'd figure that it would just be easier to machine a larger jug to fit the smaller saw.

I'm not positive that I'm right about that but It seems logical to just machine the larger bore jug to fit rather than bore a smaller one out.

 

[Jonathan Skyler]

They came in 3 displacements. The oldest are 75cc 9 (4.6ci); later they were 81cc (5.0). 045 Supers were 87cc (5.3ci). I imagine some people have put the 056 Mag jug on 045 cases and that'll give 94cc. HP stuff I can't help you with.

The old literature I have for the 75cc 045 lists the weight w/ 14" bar @ 18.5lbs. Considering the absurdity of putting a 14" bar on an 045 I don't why they would list that figure.

As for reliability, I absolutely love the saw. That's why I have four It's an older, heavier one to be sure. But one of the best of it's time. When I go to Arkansas to move a friend and cut up some trees I'm bringing my 066 and my 045 Super.

The only problem is that some parts are hard to find. Particularly, pistons, older ignitions, and clutch side bearing. Those, at least, are the ones I've looked for. Luckily the saws are durable enough.

Are you looking at one to buy?

Chris B.

I would be interested in one financially I'm not the best in shape right now someone broke into my shop stole a bunch of my arbor equipment my climbing gear bunch of my failing gear they also took 15 of my chainsaws my old 56 AV my 066 damaged my old 29 and I guess dropped it or something on the second floor coming down the flight of stairs list goes on up to my brand new Ms 881 I just bought 2023 model almost 2 Grand used one time they took it but how much you want and out of one of them or 45s and I'm a lover and respecter of the stihlname and stihl backing product

 

[Vintage Engine Repairs]

This is quite an old thread lol

 

[cbfarmall]

I'm still here but my 045s and 056s haven't been touched in quite some time.

 

[Vintage Engine Repairs]

I'm still here but my 045s and 056s haven't been touched in quite some time.

You must be one of the oldest remaining / active members!

 

[Woodslasher]

I think Del and Jacob J have been around for a few minutes too, I think Del and Jacob have been here since 01.