Engine ID for Experts Only
 

I've had this engine laying around for a few years now. It used to pull a 33% Extra that weighed in around 23 pounds. When I obtained the engine it was propped with a 22-10 Zinger and revved about 6,700 rpm or so. Pretty low rpm count is my opinion as well, but it had been running one of the old super restrictive Bennett mufflers/exhaust deflectors at the time.

I've been informed that the engine could be a 4.2 Sachs or a 4.4 Husky. From Precision Eagle or some other conversion source. Heck, I don't know. I've torn down the engine to check for a possible stuck ring and figured that while it's down it would be a good time to post some photos in the hope of a more complete engine ID. This would help immensely in obtaining the correct muffler for it.

Con rod appears to be bronze with a bronze wrist pin/bushing. Needle bearing at the crankshaft end.

I don't have an inside mike but the bore is just a smidge under 48.5mm. Carb is an SDC 40 Walbro. Another question about the carb. Anyone know what the short angled screw is just above the metering needles? If it's not an idle adjustment screw I don't have a clue to its purpose.

I'll be uploading a bunch of pics for visual clues. Thanks for the help folks. It's really appreciated.

RE: Engine ID for Experts Only
 

More pics. I had been a bit remiss and forgotton a view or two of the exhaust side of the head.

RE: Engine ID for Experts Only
 

The hub looks like Precision Eagle/Husky Challenger...The rod is steel, copper plated in the hardening process for the bores...Never saw a bronze bushing in this type engine...The angled screw is a governor, there's a ball and spring under the screw that opens when the engine vibration gets too high, letting more fuel in to keep it from going higher..
The brown carb spacer looks like a Husky part...
I can cross reference the carb number to ID the engine..Probably a 4 cubic inch, a Sachs 4.2 is 49mm, a 4.4 Husky is 52mm....
Lombard 4.2 chain saw, pretty obscure..:D

RE: Engine ID for Experts Only
 

Ask for an expert....ya gets an expert....:D

RE: Engine ID for Experts Only
 

Thanks, Ralph. I was hoping you would see this one.

This is the engine I was discussing sending to you for a check up. Overall it seems to be in pretty good shape. One of the piston skirts had been damaged a long time ago but it doesn't look to be serious. The ring was not stuck as I had suspected.

Is there any reason to disable the governor, and if so what would be the best way?

Thanks again,
Pat

RE: Engine ID for Experts Only
 

Surfer,
Sachs didn't make a 48mm bore that I know of. They made the 122super/SL,123 (47x40mm) and 120 super/SI (49x36mm). Husky made the 61 Rancher, 61(48x34mm), A65 and L65(48x36mm) between 1968 and 1974. The case was orange as is the original color of your saw. I think that your engine is a Husky between 61cc and 65cc depending on the stroke lenght.

Dave

RE: Engine ID for Experts Only
 

The governor won't work below about 10,000 rpm...Not much chance of that happening unless the prop comes off ;)

RE: Engine ID for Experts Only
 

Roger that[X(]

Mr. Wallace, thank you.

I went out and removed the carb. Following are all the markings that are visible without fully disassembling the carb. For reference purposes, the side of the carb with the needles I'm calling the bottom of one side.

Cover plate is stamped "Walbro" "SDC" on opposing sides of the cover plate.

Rear butterfly is stamped 34-40

Choke buttefly is stamped 62-33

Base of the front of the venturi has a 36 cast into it just under the choke plate.

Front of the carb has a circular indentation on each corner. One indentation has a 6 stamped in it, the other a 1

Rear face of the carb has the letters S P O R E stamped into it in a radial arrangement.

Bottom side of carb are two more circular indentations. One stamped J3 and the other 40

Now for where to obtain 2 different sizes of piston rings for an old Husky. Seems this one is worn out.

There are no other marks, scars, or tattoos that I was able to observe. Thanks again to all.

Pat

RE: Engine ID for Experts Only
 

I just saw 3 brand new Walbro "SDC" carbs for $10 each. Capt,n

RE: Engine ID for Experts Only
 

No problems with the carb. When I took the engine out of it's last mount it worked just fine. Ring's worn out though.

RE: Engine ID for Experts Only
 

Surfer,
If the stroke is 34mm, here is a complete piston kit for cheap. It may even work on the 65cc, if it dosen't uncover the exhust port. Many of the newer Husky pistons have ports above the wrist pin to allow trapped charge to escape. This also cools the piston crown from the inside.

Dave


http://cgi.ebay.com/Husqvarna-Husky-...QQcmdZViewItem

RE: Engine ID for Experts Only
 

Dave,

Thanks again. Very much!

RE: Engine ID for Experts Only
 

I have the same one and just had work done on it. It is a Husky 4.4 From Precision Eagle. Make sure that you have the right gasket for the carb on it or it will dive you crazy!

RE: Engine ID for Experts Only
 

Frank Bowman can make a ring for it. I don't have his contact info--thats on a different hard drive that I don't have plugged in right now. Someone will have his info. Maybe W8YE--I'm pretty sure I've seen him post Franks info a few times.