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Post by lesorubcheek on Oct 17, 2013 19:37:56 GMT -5
All 750s are not created equal. Started getting into 750s a bit and if you ever look in the IPLs, they indicate there's a different crankcase for units built before lot #8074. Now what could be different between crankcases? Dug out a few parts and here's the answer. Here's the original part from the inside: And here's the newer improved: Notice the wider braces above and underneath the bar studs. This explains why they call out different bar stud part numbers. Here's pics from the outside... original first: and here's the newer version: Very clear to see the extra webbing added to re-enforce the area behind the bar mount area. Yet another example of Homelite's continuous improvements to parts during their production life. Dan
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Post by tribulation138 on Oct 19, 2013 7:47:16 GMT -5
good eye good eye
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Post by sweepleader on Oct 20, 2013 10:17:27 GMT -5
That would be a "steel safe" change to the tooling needed for die casting. That means that the change would add size to the part by cutting away steel from the mold, very inexpensive compared to having to add metal to the mold by welding or making a new mold. There are likely many such changes to similar parts that are not documented in a part number change. Changing the number costs the manufacturer money too, they have to keep track of the number and the parts that go with it. This one required a part number change due to the bar stud change needed to accommodate the new ribs. Then they had to track two new part numbers. My guess is they would not have done that unless they had a history of casting failures in that area. Anyone ever see a broken one?
As the man said "good eye". Keep them coming. Dan
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Post by lesorubcheek on Oct 20, 2013 20:21:45 GMT -5
Great to learn about tooling Dan. Makes perfect sense.... I'd never thought about that perspective before. First thought after reading your reply was; wonder what ever happened to all the dies! It'd be something if some were still around and by some miracle a run of some of the impossible to find parts could be made once again. Sure it's just a dream, but ya never know what may happen.
Dan
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Post by TALLGUY on Oct 21, 2013 8:28:08 GMT -5
Great to learn about tooling Dan. Makes perfect sense.... I'd never thought about that perspective before. First thought after reading your reply was; wonder what ever happened to all the dies! It'd be something if some were still around and by some miracle a run of some of the impossible to find parts could be made once again. Sure it's just a dream, but ya never know what may happen. Dan If you look in for the makers mark inside the casting the company(LUNT)cast most of the parts for Homelite went under and was sold off at auction a few years back (2008). Im sure everything was sold for scrap.
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Post by sweepleader on Oct 21, 2013 18:53:12 GMT -5
The molds are large blocks of special steel and bring good money for scrap, Greg most certainly has hit the mark regarding the fate of the molds. Most probably were scrapped shortly after they were no longer used in production. The company I work for uses die cast aluminum parts, that is what happens to our molds when a part is superseded.
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Post by lesorubcheek on Oct 21, 2013 18:58:44 GMT -5
Sad to hear, but wouldn't expect differently. Even if molds were still around, imagine it'd be a long shot for a company to try to use them and actually make any parts. Still, it's nice to dream. Lot's of great stuff came from Alcoa and Lunt.
Dan
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Post by lesorubcheek on Nov 20, 2013 17:39:18 GMT -5
Getting some parts ready for the rebuild I'm doing and thought this may be of interest. There's been at least 4 different fuel/oil tanks used on the 650/750 series. The original 650 had only two anti-vibe attachments on the tank, and had an adjustment on top for the auto oiler. The next gen 650 had the same anti-vibe setup but the auto oiler had been eliminated. Next, for the Super 650 and early 750s, a third anti-vibe was added, the extra anti-vibe added on the clutch side. The fourth update was to allow clearance for the beefed-up case casting. Here's the tank used on the early 750s. and here's the tank from the latter 750s with the area removed for case clearance. The arrow shows the area that changed. The part number is denoted with a -B for the latter and -A for the first. If you have a case with the added ribs, the previous rev tank will not fit. Dan
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Post by Eccentric on Nov 21, 2013 4:23:27 GMT -5
Very interesting. Thanks Dan for continuing this.
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Post by lesorubcheek on Nov 21, 2013 17:50:28 GMT -5
You're welcome Aaron. Nice to see you in this neck of the woods. I'll try to do some more, it's just the problem of finding time.
Dan
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Post by Eccentric on Nov 22, 2013 14:51:24 GMT -5
You're welcome Aaron. Nice to see you in this neck of the woods. I'll try to do some more, it's just the problem of finding time. Dan Hello Dan. I've been registered here for a while, but haven't spent much time here over the years. Always spread so thin for time.....
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Post by lesorubcheek on Nov 24, 2013 17:23:36 GMT -5
There's been at least 3 different muffler covers used on 650 and 750s. Pretty sure most 750s came with the latest one with the open front. The one on the far left is a rough casting. It has the part number molded. The one in the middle is a smoother casting and doesn't show a part number. Strange thing is all the IPLs I've looked through only show the -1 for 650s and -2 (cover on the right) for the 750s. Nothing shows a different part number between the one on the left and the middle one. Dan
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Post by Eccentric on Nov 25, 2013 15:12:51 GMT -5
The 750 I worked on (6 shoe clutch model) has the open front cover.
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