Hello all, Anyone out there ever converted a Echo 610 twin?? Just wondering how much of the Org. saw can be used and what else you have to machine for it?? I'v done a bunch of single but never a twin!! Thanks for all your help on this one!!!! Hooker53

both D&B and BME have engines based on the echo twin. check their sites for pics and see how they did it. and post some pics for us to see and maybe make some suggestions.


dave

I converted 3..They look funny with the one spark plug pointing down and the other up, but run very well, about like a G62, but nardly any vibration.....They are the basis for the D&B twin...D&B buys cylinders from one side, so the plugs both face up...the carb is on a reed valve housing that faces it sideways, so a new mount can be made from G10 to mount the carb vertically over the reed valve. The case takes a little more cutting than a normal conversion, but is flat on the back for a mount..I know where there is another, not converted, if anyone wants one...

Thanks you two for the info. RCIGN1 can you send Pics?? On the 610 that you know of-----how much??? I think one of these would be super on a 90 in. wing Hooker. I have done several singles and have had good results. What kind of Ign. is on the stock saw?? Thanks for all the help.

$200 for conversion...The owner lurks on these forums, maybe he'll see this...I'll try to find his user name, looks like he changed it...

Thanks ---Is yours the EVL model and what the heck does that stand for???? Ha. Ha. May take you up on that!! Can you send Pics??? [email protected] Hooker53

CST-610-EVL and CST-610-EVLP, also John Deere 66SV..Don't know what the letters are for...
Can't send any pictures, no digital camera...I had some a few years ago, maybe one or two are left here somewhere....

Here's mine. I have a friend who scoured the pacific northwest looking for old echo chainsaws. He found 3 and I got the crank from one of them. We ordered crankcases, pistons, cylinders and prop adaptors from BME (he gave us a very decent price) and we each built an engine. The crankcase which I believe is from either the backpack leaf blower or air compressor is much more suited for RC use than the chainsaw case. The chainsaw case is difficult to adapt a mount to and this case shown has 10-32 fasteners on each corner. I attached an aluminum plate to spread the load out. Haven't run mine yet. Will get to it this summer. Haven't built an airframe for it yet.

Thanks loads for sending the pics out. It looks like you have it going on. I would love to wind up with one of those. Thanks for the tip on the backpack case being more suited. It looks like you bought the Sec. right jug so as to throw both plugs the same way. Thats the only way to go. I'v done alot of singles but no twin. I just checked into a anodizing set-up for the engines I do yesterday. If you get one too many stock backpack engines---let me know I will take one if you want to sell it!!!! Thanks again for the Pics and let us know how it's running!! Hooker53

I made a square hollow mount and put the ignition and coils inside it...Never did find the pictures....The mount is easy, just drill the case screws all the way through and run 10-32 bolts all the way through the case from the front into the mount plate....[8D]
The cylinders can be turned 180 degrees but it takes some bolt hole mods and there are locater pins in the way...Still looks a little funny, the plug angles are different but at least are on the same side..The carb can be mounted vertically on a new block made from G10 epoxy board, then there's no funny linkage to the throttle servo....
All the threads on the engine are metric, you might want to replace the 10-32 mount screws in the corners with 5mm x .8 screws, the diameter is a little larger and will hold better..10-32 screws will strip out you go too tight....

In post #8, pict 2, isn't the carb butterfly backwards?

Hey Antuque. Yea--I saw that but look more like a choke plate to me. Carb butterfly don't have any holes in it does it??? Later Roy

Sorry about that ! It didn't register with me that it was the choke plate I was looking at and not the throttle plate. Old eyes is my only excuse !

Antique, Don't you worry about that!!! I had to put my $3.96 Wal-Mart glasses on just to read your Msg. Too much fine machining and welding down through the years!!!! ha. Ha. There ain't much dif between the two plates anyways!!! Easy to do. When putting these things back together I have switched the two!! Have a good one.

Here's pix of the carb linkage. It ain't pretty, but it works well. Never bothered to do anything about the choke - just intended to leave it open when flying and close it off when not for protection. Carb sure sticks out a lot. Again, not pretty but functional. Sure won't be difficult to choke! RCign, interesting point about the metric threads. The 10-32 fit excellent, not sloppy at all. Must have another look at that. Where would you recommend buying a set of quality 5mm x .8 fasteners like you're talking about? Last thing I want is the cylinder bolts backing off! Regarding the cylinders, this is what Mr Baker sent out and they fit perfect. Didn't have to mess with altering anything - it all lined up perfect. Bought the mufflers off a gent here on RCU - I think they were D & B. The other thing I'd like to replace is the prop hub bolt. The bolt I have is from Home Depot. I seriously wonder if hardware grade is up to the task. I've been told about an industrial fastener supply firm here in the city - will check them out. As an aircraft mechanic I'm spoiled by aviation grade stuff - that's what all those are on there now... but if they're not the right size I'll swap 'em out.

Daryl, I sure would like to try one of them myself. I have a scratch built project in the works that would be about right for that. I have plenty of the single bangers around but no twins. As for the MM bolts, try WWW.smallparts.com I know what you mean by the sae bolts. I use alot of them on home builts. Let us know how the enguine runs and thanks for posting the pics. Hooker53

Keith sent you 2 of the same side cylinders, like he uses on the D&B twin..
Most hardware stores sell metric fasteners...If the prop bolt is not grade 8 it would be a good idea to find one... I buy all grade 8 fasteners from a large industrial supply, MSC...Cheap when you get 100 at a time.
The 10-32s are only about .006 smaller, and the threads are almost exactly the same..I tap my G10 carb blocks with a 10-32 tap and use 5mm bolts, they "squeak" in and are almost self locking....
One of my customers replaced my 6 grade 8 prop bolts with some longer hardware store bolts..Almost made himself a soprano when the prop came off while he was standing in front of the engine while running it up...Be careful....[8D]

Hooker53 - just checked BMEs website http://www.bmeengine.com/ and noticed that they're not offering the 61cc twin anymore. Maybe if you phone him up he has parts left he'd be willing to sell off. I know when my friend was phoning around checking prices they gave us the best price... D & B also sells a conversion here http://www.dandbengines.com/ Frankly, ordering the parts and building one up isn't that cheap. Finding one used at a decent price is the way to go. Apparently the Echo twin chain saws weren't a big success with the logger crowd for whatever reason. On the other hand, on the west coast there's a lot of guys that collect chainsaws and I gather it has some collector value. Goodness knows my buddy had a hell of a time digging the ones he did find up. The one I got had lunched piston and cylinders but the crank was OK. Nice twin, but they are priced almost the same as the 100cc engines! 3W offers a 48cc twin. Truthfully one of the new lighter 50cc singles like the BME or DA probably will offer almost as much power in a lighter package. That MVVS 58cc single looks very nice too. Those 50s and the 58cc go for less than $600 - the 61cc twins are/were all priced around $1000. Frankly, if someone was too buy me a brand new BME 50, DA 50 or MVVS 58 I''d be possibly be willing to trade. The DA 50 in particular appeals to me. Too bad Keith hasn't got that BME 55 Extreme out yet. I have a CH ignition unit for the Echo but would rather not part with the synchro spark unit as I'm using it with my Zenoah G62. The reason I'd be willing to sell or trade is I like to fly light aerobatic 3D style planes and power to weight ratio is important for me.

Thanks Daryl for all the info. Yes I noticed the other day that they had stopped offering the smaller twin. All of the engines you mentioned are good. I had the chance to get a NIB Z-445 a few months back for a real low price but just could not swing it at the time. I sure hav beat myself up for letting it pass. I like what I see in the Mvvs. I have a nib Mvvs 1.60 that I'm thinking about putting in a Carl G. Sukhoi. I don't think it would be too overkill. The only thing is----if I swing the head down I will have to make a muffler to route the exhaust down as well. If I throw the head out to the side I can use a Bisson mufler that will throw the pipes out of the bottom but sure don't like the idea of having to cut a big round hole in the side of that beautiful cowl. decisions--dicisions!!! Ha. Ha. The Mvvs 1.60 just weighs in at 2 lbs 4 oz. so no real Wt the worry about. I hear tells of these engines swinging a 18/8 prop at over 7200. I will wind up with a twin one day I think. I have a set of drawings for a chuck cunningham hooker that is 120 In. span I think would be great for a twin. I have scratch built three of the 60 size hookers and man do they fly. Have a good one and again thanks for all the info. Hooker53