Oregon sprocket on 066

[timberwolf]

What do I need to replace to use oregon sprockets on an 066? I dug a bit for info, but can't seem to find anything that outlines the difference between the two drive systems.

I am guessing the inner diamiter and or spline height are different, so do I need a new clutch drum?

Thanks

Brian

 

[Kneejerk Bombas]

They are not the same?

 

[rmihalek]

If possible, the most trouble-free solution would be to bring the current sprocket to a well-stocked oregon dealer and match it up in person. I just got a new Oregon sprocket for my 028 (to switch from 3/8ths to .325) and the inner diameter was too big, even thoug this is the sprocket that Oregon recommended. I ended up just going to one of the local Stihl dealers and he had the OEM .325 7 tooth I needed.

 

[Tony Snyder]

Oregon calls out either 35464X 3/8 or 35460X .404. They make no note in the book that there are any alternative fit up issues. Should work.

 

[timberwolf]

Unfortunatly I am looking at mail ordering, so I want to get what I need figured out before I order.

Note my motivation is not to save a buck or two per sprocket, but to take advantage of sprocket configurations not available through the Stihl dealer.

 

[jokers]

This is the same old misunderstanding or ignorance of the fact that Stihl uses a proprietary "mini" spline on their small saws that noone else makes or uses. The poor fitup if you try to slap a different brand rim on is not because of poor manufacturing, it`s just that the two were never meant to be paired up. It`s like putting a 3/8" nut on a 5/16" bolt, it just doesn`t fit. To be able to run generic "small" spline rims vs Stihl`s mini spline rim, you must change out the drum also, then it`s a simple as any other rim change. You`ll also be money ahead over the long run.

The 066 takes an Oregon large spline rim, the standard on larger saws from all manufacturers.

Russ

 

[Kneejerk Bombas]

At the Oregon site there is a PFD document with actual size outlines of the different size rims. You can print it out and lay the old rim on it to see if it fits.

 

[rmihalek]

It was the mini-spline on my 028 that caught me out. I probably should've bought a new drum, but now I have a 3/8ths and .325 for the saw anyway. The Stihl brand sprocket was only $6 at the local dealer. The Oregon brand small-spline sprocket was $5 mail order (then shipping costs added) so they ended up costing about the same.

 

[timberwolf]

Russ, Just confirming what you are saying. Yes the small saws have rim sprockets that are not the same Stihl vs Oregon.

But what about the larger drive of the 066 is that the same stihl vs oregon or is it also different as are the smaller sprockets?

Thanks

 

[lucky]

TW, A large rim sprocket is a large rim sprocket. you should be able to fit one up without any trouble. You can order them from baileys or madsens and there's other stores perhaps in your area. Do not buy a carlton sprocket. I got some from baileys a while back and they were machined very poorly. Your stihl dealer sells that sprocket too. My dealer charges 8 bucks. Don't forget to check the clutch drum and cage bearing for wear as they may also need replacing. Baileys does sell an oregan brand drum, bearing and rim for 12 or 13 bucks. can't go wrong there. All you need for the job is your bar wrench. Just pry off the E clip and pray it doesn't fly into the bushes. Good luck.
lucky

 

[timberwolf]

Thanks Lucky, I have chased thad darn clip around the garage and also in the snow last weekend. Best to take the winter gloves off before popping the clip.

Brian

 

[jokers]

Hi Brian,

Lucky is right.

Russ

 

[Toneman]

Where do you mail order your Oregon stuff from Timberwolf?

 

[Tony Snyder]

I get right ready to pry out the E clip and then throw a rag over it while I pry it loose. Something small goes flying in my shop, it's gone forever. Only my dog might know where, and he won't tell me nuttin.

Annnd, I really don't see whats the big deal about a sprocket for an 066. It's still on the best seller list. I carry them (Herr brand)

 

[timberwolf]

It's just that the local shop did not have anything but 3/8 7 or 3/8 8. And to boot he gave me funny looks when I asked. I was thinking about trying a .325 8 or 9 for milling.

Likely order fom Madsens, bailys or cutters choise.

Thanks for the info

 

[Tony Snyder]

Now, Paul Harvey, you tell us "the rest of the story".

I think puting .325 on an 066 is against some law of physics. Why in the world would you want to do that?

.325 by 8 tooth rims are easy to come by. I recently put a .325 on a 24 inch bar on a 962 Efco. They guy had a stiff back and wanted to do less reaching (firewood application), maybe I sould have tried to sell him a 694 Solo for that application

 

[tony marks]

lose the clip .. never by this pro.. i never crawled all over the work area on hands an knees looking . dont believe me ,ask
my wife shell tellu i never utter cuss wds or nothing.. never kicked anything either.. for real now.

 

[IndyIan]

TW,
I'm pretty sure all you can get for .325 pitch on the large spline is a 9 tooth sprocket. Oregon doesn't carry an 8 tooth. I looked at this when I was outfitting my 372 for milling. I calculated a 10% faster chain speed with a 9 tooth .325 vs. a 7 tooth .375 and figured that would be too ambitious for a 372 although the kerf is more than 10% thinner. I'm sure your 066 will do just fine though.

Now I am thinking of trying the .325 setup anyways as I want a 22" bar and I might as well get a .325 pitch nose on it and then I might as well get a ripping chain for it too Funny how things can fall into place like that!
Ian

 

[timberwolf]

325-9 might not be to bad on smaller stuff, I find 3/8-8 ok for anything up to 14-16 inches in diamiter. Not much diamiter differnce between the 325-9 and the 3/8-8, a few more cutters in the wood, but a narrower kerf. So I guess it's worth a try.

Don't see why there is not a Oregon 325-8 on the large drive, the OD of a 325-8 is larger than a 3/8-7 by about 1/16 of an inch.

Brian