Fellas -
These are pretty cool saws, one of the very few twin cylinder models made, and seem to have a fair amount of interest so I thought I would start a thread to consolidate a lot of the information that's out there.
Starting with Mike Acres, here are the spec's - http://www.acresinternet.com/cscc.n...6af40002b8f7/089240ecb997a24888256d0d001db8d4
A John Deere 66SV (basically a yellow 610 EVL) thread by Brad Snelling: https://www.arboristsite.com/community/threads/john-deere-66sv-echo-610-twin-cylinder.264480/
And here's a MONSTER 50 page thread from MasterMind - https://www.arboristsite.com/community/threads/mastermind-meets-the-echo-cst-610evl.214660/
Some of the highlights -
-Produced in 1986 (maybe only 2 years of production?), and not a lot out there. I think the serial numbers on the four that I have are all under 10,000.
-At 61cc's (horizontally opposed cylinders) and 15 lbs PHO (powerhead only), it's not a flyweight. Most folks are not very impressed with the power to weight ratio.
-Pistons are the same for front and back cylinders, but the jugs are different. A quote from @blsnelling "The two cylinders are very different. The spark plug comes nearly straight out of the center on the rear. On the front, it comes out at nearly a right angle. Because of this, the combustion chambers are very different. As I expected, the compression on the rear cylinder is significantly higher, because of the pocket in the combustion chamber required to let it come out at such an angle."
-The ignition for these is the achilles heel. They have one CDI module (part 15060116131 or 15660116130) and these are no longer available from Echo. The saws have two coils (part 15662616130). Also no longer available, but I think these are easier to find than the CDI modules. FYI - I spoke with someone who manufactures RC engine ignitions for twins (https://www.ch-ignitions.com), he said using one of his ignitions could possibly work, but you would need a small battery (size of 4 AA batteries) to power the ignition. I'm betting that his company could manufacture a replacement CDI module if they wanted to; I asked him if he would be interested.
-Another achilles heel is the bottom plate on the rear handle (part 35112316131). It's thin and often cracked. The bracket that attaches the wrap handle to the saw (part 35161416131) is another problematic piece -- often broken. The saw in the below picture is mine, serial number 7558; it has both broken.
And this is serial number 8096 (also mine). Has both intact.
-Prices for these are all over the map. Clean used ones bring up to $1,000 on eBay, perhaps because model airplane folks like to harvest the engines to use for larger planes. Ones that don't run can still bring $100 or more.
If you have info, pictures, comments, etc, please post!
Scott
These are pretty cool saws, one of the very few twin cylinder models made, and seem to have a fair amount of interest so I thought I would start a thread to consolidate a lot of the information that's out there.
Starting with Mike Acres, here are the spec's - http://www.acresinternet.com/cscc.n...6af40002b8f7/089240ecb997a24888256d0d001db8d4
A John Deere 66SV (basically a yellow 610 EVL) thread by Brad Snelling: https://www.arboristsite.com/community/threads/john-deere-66sv-echo-610-twin-cylinder.264480/
And here's a MONSTER 50 page thread from MasterMind - https://www.arboristsite.com/community/threads/mastermind-meets-the-echo-cst-610evl.214660/
Some of the highlights -
-Produced in 1986 (maybe only 2 years of production?), and not a lot out there. I think the serial numbers on the four that I have are all under 10,000.
-At 61cc's (horizontally opposed cylinders) and 15 lbs PHO (powerhead only), it's not a flyweight. Most folks are not very impressed with the power to weight ratio.
-Pistons are the same for front and back cylinders, but the jugs are different. A quote from @blsnelling "The two cylinders are very different. The spark plug comes nearly straight out of the center on the rear. On the front, it comes out at nearly a right angle. Because of this, the combustion chambers are very different. As I expected, the compression on the rear cylinder is significantly higher, because of the pocket in the combustion chamber required to let it come out at such an angle."
-The ignition for these is the achilles heel. They have one CDI module (part 15060116131 or 15660116130) and these are no longer available from Echo. The saws have two coils (part 15662616130). Also no longer available, but I think these are easier to find than the CDI modules. FYI - I spoke with someone who manufactures RC engine ignitions for twins (https://www.ch-ignitions.com), he said using one of his ignitions could possibly work, but you would need a small battery (size of 4 AA batteries) to power the ignition. I'm betting that his company could manufacture a replacement CDI module if they wanted to; I asked him if he would be interested.
-Another achilles heel is the bottom plate on the rear handle (part 35112316131). It's thin and often cracked. The bracket that attaches the wrap handle to the saw (part 35161416131) is another problematic piece -- often broken. The saw in the below picture is mine, serial number 7558; it has both broken.
And this is serial number 8096 (also mine). Has both intact.
-Prices for these are all over the map. Clean used ones bring up to $1,000 on eBay, perhaps because model airplane folks like to harvest the engines to use for larger planes. Ones that don't run can still bring $100 or more.
If you have info, pictures, comments, etc, please post!
Scott