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Post by chainsawwhisperer on Sept 9, 2009 5:15:02 GMT -5
So, I ended up getting a 750 about a week ago. It took a couple of days for the initial shock and excitement to wear off, seriously, the anticipation of getting one and the excitement of actually getting the saw home has been beyond compare (saw related). I ended up trading a nice Mac Timberbear, and a nice 330 for the 750. Spike60 (who I got it from) was only interested in owning saws that he could use, not big monster saw that you can't use every day. He would have been happy with just the Timberbear, but I felt that would have been unfair to him, so I gave him the 330 as well. Spike said he was just happy to see it go to a good home. I did tear the saw down, The piston is salvageable, the cylinder is not. No scores, small amount of aluminum transfer, but the chrome plating around the decompression valve is gone - I think the saw was run without the link that holds the valve closed, (the link is missing) allowing hot combustion gas to exit the cylinder through the 1/8"hole for the decompresser, over heating that area. The saw had been apart before, it was assembled without a base gasket. I ordered a few small parts already, and bought a new cylinder from Ebay. I'll post some more pics soon. Jim
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Post by chainsawwhisperer on Sept 9, 2009 5:17:48 GMT -5
Can someone post a pic of the decompression valve link? It's listed in the IPL as a 'shoulder screw' It connects the decompression lever to the actual valve.
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Post by billg on Sept 9, 2009 8:40:26 GMT -5
Jim,
Glad to see you are getting what you need. I can take some pictures of the decomp tonight if I can remember.
Bill
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Post by rharley95ci on Sept 9, 2009 9:35:47 GMT -5
Jim, I haven't gotten my 750 yet but it's on the way. I won one on e-bay the other night and can't wait to see if it's as good as they discribed it. Keep in touch with how you're doing on yours and I'll let you know if I got a good deal on e-bay when it gets here. Dave
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Post by MCS on Sept 9, 2009 11:59:22 GMT -5
Can someone post a pic of the decompression valve link? It's listed in the IPL as a 'shoulder screw' It connects the decompression lever to the actual valve. There is no linkage. Item 43, the valve, is connected to Item 26, the Arm, with item 42, shouldered screw. Do you have item 27, torsion spring Look at the IPL for the cylinder and you will see that the valve is held closed by a spring which is held in place by a snap ring. According to my IPL, the cylinder includes the valve. I'll bet that snap ring is tough to get in to place. So now you have a big one Craig
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Post by cbfarmall on Sept 9, 2009 14:42:36 GMT -5
I believe I have a junk 750 cylinder w/ all the decomp stuff still in place. Figure out what you need and I can check.
Chris B.
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Post by chainsawwhisperer on Sept 9, 2009 20:58:24 GMT -5
Thanks everyone for the replys. Chris, what I would need is the link that goes between the lever and the decompression assembly. Tommorrow I will post the item # and part # from my IPL. Bill, Pics of that part would help Jim
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Post by OBR on Sept 9, 2009 21:00:51 GMT -5
Man you are lucky! Being able to get all the stuff you need for the 750 so quickly. Glad its all workin out for ya, keep us posted on the progress.
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Post by MCS on Sept 9, 2009 22:14:12 GMT -5
Thanks everyone for the replys. Chris, what I would need is the link that goes between the lever and the decompression assembly. Tommorrow I will post the item # and part # from my IPL. Bill, Pics of that part would help Jim Re-read my previous post. What may look like a link is not available as a separate part. Here is a picture.
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Post by cbfarmall on Sept 9, 2009 22:59:24 GMT -5
Thanks everyone for the replys. Chris, what I would need is the link that goes between the lever and the decompression assembly. Tommorrow I will post the item # and part # from my IPL. Bill, Pics of that part would help Jim Yeah, I checked out the 750 cylinder. The decomp valve is intact, along with the slotted metal linkage. Do you have the special screw to connect the linkage to the plastic lever? I may still have that around. Chris B.
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Post by chainsawwhisperer on Sept 10, 2009 5:35:51 GMT -5
Craig, I missed your entire post, Sorry. That pic is great! It shows the part(s) that I'm missing. Here is what I have, Just the plastic arm. I have nothing in between the arm and the cylinder. The cylinder does have the 'C' clip, the spring, and a steel tapered valve that fits into a tapered seat. The piston, is not great but I am going to polish it up and use it, until I can find another one. Here is the obligatory ripped intake boot I got a new sealing boot to replace this one, but need the spring that fits inside the boot. I also figured out that I do not have the cover that fits over the carb to seal the air box. Not the air cleaner cover, but the piece that is under the air cleaner it's self. Thanks for everyones input and help Jim
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Post by chainsawwhisperer on Sept 10, 2009 5:39:03 GMT -5
Chris, I think I might need those parts. But,I might get lucky and the new cylinder will come with them. I'll let you know. Jim
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Post by cbfarmall on Sept 10, 2009 9:35:32 GMT -5
You're right, it may have those parts. Also, one thing I thought of last night. I recall reading that there were 2 different valves, not at all interchangeble--i.e. the seat in the cylinder is different.
Chris B.
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Post by chainsawwhisperer on Sept 10, 2009 10:25:27 GMT -5
The new Cylinder just came in the mail!!!! It has the whole decompresser assembly I think I now have all the parts needed to reassemble. CSW
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Post by MCS on Sept 10, 2009 10:35:35 GMT -5
You're right, it may have those parts. Also, one thing I thought of last night. I recall reading that there were 2 different valves, not at all interchangeble--i.e. the seat in the cylinder is different. Chris B. Two different valve assemblies
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Post by chainsawwhisperer on Sept 10, 2009 11:23:08 GMT -5
Craig, you my friend are a Homelite God That Pic tells the story between the 2 valves. My old cyl has the early style valve. The new cyl has the new style valve. I haven't been able to find replacement rings, and planned on using the old ones, any thoughts on this? Jim
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Post by MCS on Sept 10, 2009 12:26:03 GMT -5
If they are not broken, use them. I have an old XL-800 that has lots of cylinder wear and the rings had very little tension. I had another posting on this. But anyway, I wasn't, at this time, going to put new rings in that worn out cylinder so I cleaned up everything and stuck it back together. It runs great. I'm going to check compression one of these days. Since your new cylinder is chrome plated the rings and piston will not damage it. DO NOT HONE that new cylinder.
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Post by cbfarmall on Sept 10, 2009 12:26:15 GMT -5
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Post by redsqwrl on Sept 10, 2009 12:45:38 GMT -5
Craig, you my friend are a Homelite God That Pic tells the story between the 2 valves. My old cyl has the early style valve. The new cyl has the new style valve. I haven't been able to find replacement rings, and planned on using the old ones, any thoughts on this? Jim Keep us posted on the Cyl install, I ran into this with a NOS cyl from RBW, I questioned the heigth of the cyl bung and never did follow up with where the differences are. I need to find the new style valve, I would bet that is the only "problem" I have, I was going to remachine the profile into the old plunger, I think I will hang tight and see what shakes out. Keep me in mind if you are sitting on a new style 750 valve assembly. Mike
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Post by MCS on Sept 10, 2009 13:54:49 GMT -5
Craig, you my friend are a Homelite God That Pic tells the story between the 2 valves. My old cyl has the early style valve. The new cyl has the new style valve. I haven't been able to find replacement rings, and planned on using the old ones, any thoughts on this? Jim I have volumes 1, 2. 3, 4, and 6 of the Homelite Service Manuals and I'm looking for volume 5. Lots of good information in these books ;D
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