MI Old Saw
Saw Builder
Searching for a couple Green & Red saws…XL-904, 870 & 875!
Posts: 168
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Post by MI Old Saw on Feb 3, 2022 14:04:32 GMT -5
Don't use ether to test your saws. I heard they make a starting fluid for 2 strokes but never seen it. I've heard that starting fluid will wash all the oil off the cylinder. I bought a beautiful XL700 off ebay. Had short video of the saw running. Got it home all excited, no run. Contacted seller and asked how he got it started. Was running it on ehter. Pulled muffler and the rings were melted into the piston. That is correct. A shot to check for fire and compression wont hurt anything, but certainly running a saw on it would washout any lubrication and cause wear quickly. I am hoping your seller makes things right for you. Did the saw seize?
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Post by rarefish383 on Feb 3, 2022 16:23:50 GMT -5
Don't use ether to test your saws. I heard they make a starting fluid for 2 strokes but never seen it. I've heard that starting fluid will wash all the oil off the cylinder. I bought a beautiful XL700 off ebay. Had short video of the saw running. Got it home all excited, no run. Contacted seller and asked how he got it started. Was running it on ehter. Pulled muffler and the rings were melted into the piston. That is correct. A shot to check for fire and compression wont hurt anything, but certainly running a saw on it would washout any lubrication and cause wear quickly. I am hoping your seller makes things right for you. Did the saw seize? That was many years ago, first and last saw I bought on Ebay. I enjoy farm auctions and looking for old dealers. I found a Stihl dealer on my way to my place in WV. First time I stopped I saw a bunch of small Hoemlites by the counter. I asked if he had any Homelites for sale, and he said a couple Super 2's and a Super EZ. I said no, I'm looking for a Super 1050 or a 750. He said, Oh, you want the big ones. He dug through piles of saws and found a running 1050 he let me have for $40, a 450, Xl925 and a Blue EZ, for $10 each. When Covid hit his prices went up to $20 each. I bought 19 saws at $20. All but one were over 70CC's. I got a beautiful Pioneer 700, 107CC's, a Stihl 075, and a Wright Blade saw 115CC's. I think one more was over 100cc's. All the rest were 70-90CC's. That one bad deal is long forgiven. Bad part the saw looked almost NOS, it was a shame he cooked it.
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Post by rarefish383 on Feb 3, 2022 16:27:15 GMT -5
No, the saw did not seize. It was always my goal to rebuild it. But, I keep buying all the good deals and never work on them.
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Post by jselden78 on Feb 3, 2022 16:48:37 GMT -5
Is that 700 complete just needing a piston?
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MI Old Saw
Saw Builder
Searching for a couple Green & Red saws…XL-904, 870 & 875!
Posts: 168
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Post by MI Old Saw on Feb 3, 2022 19:31:02 GMT -5
No, the saw did not seize. It was always my goal to rebuild it. But, I keep buying all the good deals and never work on them. I can’t say I have picked up anything complete that I would consider a “deal”, but almost all have been no running, and I have enjoyed getting them all going. There are a few exceptions…a 902AM with no spark (may have that resolved tonight), this pump, and a 113 that came to me with a terrible piston. Only the pump do I wish to keep, so working on saws to sell is a low priority. I am a pro at losing money on saws!
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Post by rarefish383 on Feb 3, 2022 20:34:36 GMT -5
I hate to put the whammy on a deal. But one of my friend's is 68 and single, and he rents a room for an old guy that's 90 and single. Their number one pass time is sipping Bourbon. The land lord was a metallurgist that developed Titanium alloys they used on nuclear subs. So, he is a rather bright guy. He's also a bit eccentric. He bought a JD 455 with a loader, and decided it was too small, so he went out and bought a new JD Compact Tractor/loader, and just lets the 455 set. He had an early 60's Iso Revolta. It was Italy's version of an AC Cobra, in luxury style. He put 300,000 miles on it, then parked it under a tree. Now it has trees growing up through it. I looked it up and one in good driving condition go for $350,000. I took some trees down for him. He told me he bought a chainsaw back in the 70's and used it once, and it's still under his work bench. Then he said it didn't have a piston. Then he asked if I ever heard of a Dolmar. Sure I have, top line German saws. Then he said his didn't have a piston. So, all of a sudden, I'm about to wet my pants. I'm thinking, is he trying to tell me he blew it up and there is no piston in it. Or, is he trying to say he has a Sachs-Dolmar KMS4 with a 3 rotor Wankel engine. Yep, he has a KMS4, and when I said I'd love to have one in my collection, he said next time you come down, go get it. That was over a year ago. He fell and broke his shoulder and was in a nursing home for 6 months or more, now with ice and stuff, I've got to waite a few more months.
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MI Old Saw
Saw Builder
Searching for a couple Green & Red saws…XL-904, 870 & 875!
Posts: 168
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Post by MI Old Saw on Feb 10, 2022 20:44:20 GMT -5
Well, I hate to admit, but this prick still hasn’t run. In fact, I doubled down and bought another one! I kid you not, this thing has the exact same issue. I have spent the last four nights messing with this pump to try and get it to fire. Great spark, rebuilt carb, blah blah blah. Something hit me regarding the fuel flow, and I decided to pull the cord 100 times and put my ear to the carburetor. Sure enough, I can hear it losing fuel pressure. It was not a vacuum issue because I had the gas cap Off. I popped off the top of the carburetor and all looks well, but on a whim, I took the new (china?) Diaphram out, and put an old somewhat flexible original Tillotson in there and snugged everything back up. Three pulls and she runs like a champ. Now to try this trick with Mr Blue.
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Post by xl130 on Feb 10, 2022 21:45:13 GMT -5
Man that’s a serious kick in the teeth! All that for a possibly out of speck diaphragm. Was it the metering side or pump side? I’d be pretty happy that I figured out the problem but furious that it was due to a crappy carb kit.
Did it pass a pressure test? Is it possible that the aftermarket diaphragm was not a RK23HS ? Not sure if the HS diaphragms differ from one kit to the next.
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okie
Saw Builder
Posts: 199
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Post by okie on Feb 11, 2022 7:22:16 GMT -5
Kinda unusual to me that it would not make a promise pop with a prime to the carb throat.
The chainsaws that I've seen that had everything else ok as you describe but no promise pop with a prime had very weak low compression (as read on a know accurate gauge) and would just flood easily and not ever start or promise pop.
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Post by rarefish383 on Feb 11, 2022 7:44:28 GMT -5
Is that 700 complete just needing a piston? Don't want to Hijack the OP's thread. But someone was interested in the saw. I put the comp gauge on it and 3 pulls it went to 90PSI. A little low. Put a shot of mix in the carb and on the second pull it fired and ran great. I had the clutch cover off and could see the fuel pulsing in the line. Tried priming about 10 more times hoping to get it to draw from the tank, no luck. But, the more mix I put in the carb, it didn't flood bad, and would start and run longer. I'm sure I got a few runs that were close to 10 seconds. 5-6 real good blips on the trigger. It should be arriving in Canada today.
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dynodave
Saw Builder
equal opportunity GEARHEAD
Posts: 246
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Post by dynodave on Feb 16, 2022 15:30:56 GMT -5
As you say a coil can spark under atmosphere. The voltage required under pressure goes up "a lot". A bad coil can arc out internally when over stressed. In an equipment rich environment the coil would be connected to a glassed pressurized chamber and shop air to 150psi will now be the test, not 14.4 PSIA. or open the test plug gap to 3/8" (electrode to plug body)...
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