anvil
Saw Builder
Posts: 139
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Post by anvil on May 4, 2012 20:13:59 GMT -5
I got a sxl-925 from 1992 and the owners manual said it was 77ccs and my older ones are from the 70's. But one of there manuals say 82.1ccs. Why are they different ccs but the manuals say they have the same bore and stroke? I really don't see a change in power. I'm sure theres a good explanation for this. Until now i always thought they were the same. Just a few years ago i figured out the difference between a sxl-12 and a xl-12 and the same for a ez. ez auto and super e-z. I always thought the difference was just an automatic oiler until i tried changing parts. That's way i joined HOH to learn more than i thought i knew. There is a lot of people here that truly know there homelites. I'm know how to fix saws with ease but when it comes to details most of you just blow my mind of the things you know thanks for all the help.
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Post by lesorubcheek on May 4, 2012 21:06:21 GMT -5
There was some talk over at AS awhile back about this. Wanna think it was Bill G. that mentioned there was a service bulletin where the late 925s were being fitted with the 4.7 piston/cylinder. Think it had something to do with reducing heat related failures, but take that with a grain of salt. Its a very good question. Maybe somebody with the full scoop will come along with the details.
Dan
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Post by MCS on May 5, 2012 15:47:05 GMT -5
I find it hard to believe Homelite would down size the XL-925 because marketing pressure would kill it. .3 cu in or a 6% reduction isn't going to make that much change but dropping below a magic number like 5 cu. in. would really hurt. There would have been a change in the IPL too, at least the latest one. Without this service memo we are just blowing smoke in the air ;D
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Post by lesorubcheek on May 5, 2012 18:51:01 GMT -5
I don't smoke, so I won't be blowin' any, but I can pass along a link to an older AS post that will at least share the info I was referring too: www.arboristsite.com/chainsaw/126982.htm I was wrong about Bill posting the info, but he may well know about the details. Hopefully someone can eventually turn up the service bulletin details. It is a fact that they downsized 'em near the end. Dan
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Post by MCS on May 6, 2012 12:45:24 GMT -5
I downloaded the two pieces of literature in that thread but by the time I get them large enough to read they are near impossible to read. I can see on the front side that it says the 925 is 4.7 cu in. but I can't see the back side to read the bore and stoke. There is always a chance that this is a boo boo and got sent to dealers before Homelite realized it. I would certainly expect that the service manager would have released Service Memo. Maybe this happened during the John Deere years?
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anvil
Saw Builder
Posts: 139
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Post by anvil on May 6, 2012 17:40:18 GMT -5
maybe the saw was from 1992. I checked acres site and that showed diff. cc same bore and stroke
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Post by MCS on May 6, 2012 17:58:00 GMT -5
maybe the saw was from 1992. I checked acres site and that showed diff. cc same bore and stroke The Acres site has a wealth of information but don't think for a second that it doesn't have errors.
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anvil
Saw Builder
Posts: 139
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Post by anvil on May 6, 2012 19:54:55 GMT -5
yeah i found that out before
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Post by lesorubcheek on May 8, 2012 10:50:38 GMT -5
I dug through some literature and haven't found a service memo yet, but I did find the 89-90 and the 90-91 sales catalogs and both of these show the 925 at 77cc. It may have been they tried to play up the 540 by dropping the 925s size a bit... who knows. I've heard it said that the later C-91s got the single reed (where it had the 4 reed previously) to play up the new XP-1000. Could have been a similar deal. Who knows. Dan
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Post by MCS on May 8, 2012 13:00:00 GMT -5
That is interesting... I have the XL-925 IPL 24831 Rev 3. that shows the part number only for the 5 cu in parts. Also, my IPL doesn't say Homelite Jacobsen so don't know what year it was released. The later literature is certainly pointing to a 4.7 cu in saw in the later years.....
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anvil
Saw Builder
Posts: 139
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Post by anvil on May 8, 2012 13:49:38 GMT -5
Great info i like the 540 but like the sxl-925 much better. I think i'm gonna tear down this saw and see if there is a difference or it was just a thing to make the 540 look more powerful. In past experience the 540 was no match for the sxl-925. I thinking to that they were tring to make the 540 look better maybe tring to boost sales or just to make the older saws obsolet. But know its time to tear into this sxl-925 and find the truth.
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anvil
Saw Builder
Posts: 139
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Post by anvil on May 8, 2012 16:48:52 GMT -5
well tore it down didn't find nothing different. Seems to be the same but it looks like the saw was work on before. So i still don't know if its a difference. One old homelite dealer told me that there was a problem with them overheating with him saying that i've had some sxl-925s that the piston and jug were trashed and the saw in great shape and very clean but alot of things could have caused that so who knows.
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sammy
Gots Tree Cred
Homelite chainsaws best there is the best there was the best they'll will ever be
Posts: 34
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Post by sammy on May 8, 2012 16:59:40 GMT -5
Man this worries you don't it.
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Post by powerking on May 8, 2012 17:02:25 GMT -5
Dan is correct about this Homelite Tech Bulletin (I have one of the huge dealer binders with a large section of just them--the T.B.'s). The T.B directs you to replace the cylinder and piston (2.00" bore) with that used on the SXL-922 if the saw had experienced overheating and/or piston/bore scoring saying this was the recommended fix. So now the saw becomes 4.7 cubes. For the SXL-925 it orginally had a 2-1/16" bore.
Tom (PK)
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anvil
Saw Builder
Posts: 139
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Post by anvil on May 8, 2012 17:17:49 GMT -5
Now that makes sense
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Post by MCS on May 8, 2012 21:09:19 GMT -5
Dan is correct about this Homelite Tech Bulletin (I have one of the huge dealer binders with a large section of just them--the T.B.'s). The T.B directs you to replace the cylinder and piston (2.00" bore) with that used on the SXL-922 if the saw had experienced overheating and/or piston/bore scoring saying this was the recommended fix. So now the saw becomes 4.7 cubes. For the SXL-925 it orginally had a 2-1/16" bore. Tom (PK) What is the date on that T.B.? Better yet, any chance you could scan that T.B. so I can add it to the XL-925 service information. I can't believe .3 cu in would make that much difference but I could believe that the 925 with a 921/922 jug and piston would have a lower compression ratio because of the shape of the cylinder dome and piston. No more thin rings either. The 921/922 didn't have compression release. Oxygenated fuel has a higher combustion temperature so maybe that came into play and dropping the compression helped lower the temperature.
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Post by MCS on May 15, 2012 7:38:46 GMT -5
This is rolling down the line but I'm going to bump it back. Tom (PK) any chance you could scan the service memo you have about this?
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Post by powerking on May 15, 2012 9:16:13 GMT -5
Craig,
I will scan this Tech Bulletin, but I have to get from my bother's Homelite dealer book, so it may be a little bit. Stay tuned (and I won't forget about it).
Thanks,
Tom (PK)
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Post by MCS on May 16, 2012 20:16:59 GMT -5
Here is the answer to this thread Looks like the Super XL-925 lost it's Super status It uses standard 2" rings and the piston from the XL-921 The date is July of 1989 this is Homelite Jacobsen time. Uploaded with ImageShack.us
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Post by lesorubcheek on May 17, 2012 7:57:45 GMT -5
Sorry, but still alot of details left unanswered in my mind. There's never been any doubt the deed was done on the later saws. The memo says it'll result in a cooler running unit. Memo came out in '89.... So for 20+ years all the 2-1/16" bore units ran fine and then all of a sudden in '89 there was a rash of failures attributed to overheating? Was it rooted in changes in gasoline chemistry as speculated earlier in the thread? An early attempt at pumping global warming hype? Random act of management (stupid decision)? Lawyers (paid off by stihl) filed a class action against Homelite for failed piston/cylinders in the 925s???
There has to be a root to the reason why they did it.
Dan
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