McCulloch 49 the Rookie Engine ....................

Model .................Crankshaft No ..........Bore/stroke...........Conrod No............Capacity...............Crank pto end ........... Ports open
intake / exhaust / 3rd Port

D-30/36 .....................50659..............2.125"/ 1.375"................55009 ..........80cc or 4.9 cu/in .........................3.................... 2/2/2
1-40...........................50659...............2.125"/ 1.375"...............55009............80cc or 4.9 cu/in.........................3.................... 2/2/2
1-41...........................50659...................................................55009...............................................................3
1-42...........................50659...................................................55009...............................................................3
1-43...........................50659...................................................55009...............................................................3.................... 2/2/2
1-45...........................50659...................................................55009...............................................................3
1-46...........................50659...................................................55009...............................................................3
====================================================================

1-50...........................50659..............2.125"/ 1.375.................55009............80cc or 4.9 cu/in...........................3.................... 2/2/2
1-51...........................50959...................................................55009................................................................3
1-52...........................50959...................................................55009................................................................3
1-53...........................57830..............2.125"/ 1.375.................55009.................................................................3 ................... 3/3/3
====================================================================

1-60...........................50756..............2.125"/ 1.375..................55009............80cc or 4.9 cu/in..........................3
1-61...........................50756...................................................55009.............80cc or 4.9 cu/in .........................3
1-62...........................50756...................................................55009.............80cc or 4.9 cu/in .........................1
1-63...........................50756...................................................55009.............80cc or 4.9 cu/in .........................1

===================================================================

Mac 15 all ... .............50659a............2.125"/1.375................47903................80cc or 4.9 cu/in.......................3 ........................2/2/2 ......1964/68

===================================================================

Super 44..........................................2.125"/ 1.375....................................... 80cc or 4.9 cu/in........................1
D-45.................................................2.125"/ 1.375........................................80cc or 4.9 cu/in
Super 55....................55005.............2.125"/ 1.375.................55010..............80cc or 4.9 cu/in........................1
Super 55a.....................................................................................................................................................1

=================================================================

200.............................50659..............2.125"/ 1.375...............55009a.............80cc or 4.9 cu/in.......................3
250.............................50659a............2.125"/ 1.375...............47782a.............80cc or 4.9 cu/in.......................1

300.............................60313..............2.125"/ 1.375...............47903..............80cc or 4.9 cu/in.........................1

640............................50756a..............2.125"/ 1.375................47903............80cc or 4.9 cu/in.........................1

================================================================

MC5
1960.........................50756..............2.125/1.375.................55009..................4.9...........................................1

Mc 49a ........................................................................................................4.9 ........................................................................... 2/2/2
Mc 49c ........................................................................................................4.9............................................................................ 3/3/3
Mc 49E ........................................................................................................4.9 ............................................................................3/3/3
49 M/C .........................................................................................................4.9 ....................................... 2 .............................. 3/3/3

Anyone know the numbers stamped on the back of the block for the 49, 49C and 49E? Are they all the same or ???
Anyone know what changed from the original 49 to the 49C?
I also need to know what type of flywheel came on the 49 and 49C... modern version like the 91 and 101 series or
the lighter version like the earlier models. How about the rod... slotted or no?
Thanks in advance for any info you guys can provide.
Regards,
Steve O'Hara

===================================

by Scott Kneisel ť Tue Feb 08, 2011 2:08 pm

Hi Steve,
Attached is a comparison of a Mac 250 saw block...early version vs late version. The late version is the Mc49 and
Mc49C block and the part numbers are stamped on the block as shown. I have only had one 49E block come thru my shop
and I don't think it had any numbers on the block, I believe it had a nameplate riveted to the block similar to the
Mc92 & 93. Dick Teal has that block now, maybe he could tell you for sure. I know it has radiused head fins that are
distinctive from the 49 and 49C. All have a needle bearing PTO.

49 and 49C have a non slotted rod like the Mc8 rod and a 1 3/8" stroke crank with taper PTO, RH threads and a key
slot. The 49E has LH threads and no key slot.

Don't know if the 49C or E have 5 degree flywheels but the Mc40 had a standard flywheel.

Also, the Mc49 had a thick ring piston, 49C and E have thin ring pistons

Correction of typo, Mc49 had a standard flywheel like the Mc8 and most of the chainsaws from that period.

==================================

by Dick Teal

Steve,

The 49E I got from Scott has the number plate rivited onto the block. I'm in Florida until mid-March so I can't check if
there's a stamped number also; I don't think there is one.

Dick Teal
--------------------------------------------------------------------------------

Scott Kneisel

Here is a pic of a 49E block. This one has the 3rd port wall removed because it has been modified with boost ports. You
can see where the metal tag was riveted on the block and the rounded head fins. It is a distinctive block.

Mc49E Block.jpg

=====================================

Thanks for the help guys. I have two here and one matches the pics of the later 250 block and has the same numbers. The other
one is a bit different... same shape fins, no numbers stamped on the back , exhaust port gasket surface recessed for the
rectangular copper gasket, structural ribs running from base of intake manifold to the bottom of the block like the 91B blocks,
threaded insert in the third screw location for the exhaust instead of tapped into the alloy. Shroud says 49C but it has the
sloper manifold with the little Walbro carb like the 49E. Do you supppose there was a transitional 49C that came with the
smaller intake? Maybe the rules allowed the older engines to be fitted with the smaller carb and intake and still be legal to
run in the kid class???
Regards,
Steve O'Hara

==========================================

Steve,
I raced Rookie class using the 49C and 49E's and I don't recall a transitional 49C with the smaller intake / walbro carb.
Still going form memory here, but I believe that carb wasn't introduced until the 49E came out. You could run a C carb on
an E and visa versa. We ended up putting a C carb on the E motor - like a completely different engine - ran stronger and
easier to tune.
John Fields
==========================================

Scott Kneisel

Just had a thought, we are forgetting about the Mc49 M/C.

Maybe that block is the same as the 49E but without the curved head fins??
Just wondering but I just looked and the 49M/C IPL shows the same part number for the block as the 49C.

Anybody know what year the Mc49E was produced?

================================================

by Terry Bentley

Mc49E was introduced in 6/72 and ran thru 6/76. The Mc49 m/c is different from the other models. It has the intake opening like 91 series, no third port induction, and double ball bearing crank.

===================================================

Wow Terry,
That is incredible!! Totally different from what is in the McCulloch IPL that I have. The IPL also shows a 3/4" straight crank running in a needle bearing and your's is a taper shaft. I guess McCulloch documentation didn't keep up with what they were actually producing.

That crank must be very rare with a 1 3/8" stroke and BB on both sides. I'll bet that block is pretty rare too.
A real keeper.

==================================================

Guys,

I was looking at a June 1968 Karting magazine tonight and found a McCulloch ad that shows the three models offered at that time.
The ad shows a Mc 49, 91 and 101. The picture of the 49 shows an all yellow motor that looks just like a Mc 2.
The image shows the motor from the recoil side and there is no label on the shroud in the position where the labels are located on the 49C and 49E.
Anyone have a picture of a Mc 49 sticker???

Steve O'Hara

====================================================

More on the early 49...
I found the IKF tech specs published in March 1969 and they show the specs for the 49C and a 49A. The A version is a two exhaust, four transfer port block with the shorter opening under the intake manifold and it also has the ribs running the length of the area under the manifold like the Mac 5 etc. The specs also show a different piston for the A model from the C model and it looks as though the rings are the thicker version although the scan is kind of fuzzy so I can't say for certain.
It's beginning to look like adding the 49 line to my collection is going to take up a lot more time and space than I first thought!

Steve O'Hara

=====================================================

by Scott Kneisel

Yes Steve, that line seems quite complicated. Sounds like McCulloch was putting engines together for the rookie class from chainsaw parts. I purchased an Mc49 about 5 years ago from a guy who had it on a minibike and he claimed it was totally original without being touched. It was painted all yellow and looked to me like only the carb and intake manifold had ever been removed so he was probably right.
Now get this....
It had the 49C block like the picture I posted, had a thick ring piston and the big mystery was the crank....it had a straight 3/4" crank with a 3/16" keyway like the 49M/C. I suppose the crank could have been changed for the minibike app when it was new but it sure looked like it was never apart.

Just an FYI, the VERY early 250 saws had the block you are speaking of. I have one and it is stamped 250 but only has 2 exhaust ports drilled and 4 intake ports. I'll bet they used that block and I'll also bet it was a real dog!!

================================================

Steve, on that Mc49 block was the intake opening like either one of these?

Scott, the very early 250 saws 63/64 were leftover 200 models. They had all intake and exhaust drilled including third port
induction. There were several variants of the 250 models that ran from 1963 thru 1970. The 250 pictured below has only four intakes, all three exhaust and no third port. Yours has the four intakes, two exhaust, but you didnt mention about the third port indution.
The 4.9 cubic inch Mac motor was the most commoly produced model and used for a lot of things, including
commercial applications. The straight shaft would fit the bill for that easily. During the mini-bike craze that followed the kart explosion, it would only make sense that Mcculloch would have offerings to that market also. Clinton, Power Products, and West Bend sure did.
Just about any of the early saws have two thick ring pistons, that are all interchangable. So mocking the Mc49 should be easy enough.

===================================================

by Terry Bentley

steveohara wrote:
The other one is a bit different... same shape fins, no numbers stamped on the back , exhaust port gasket surface recessed for the rectangular copper gasket, structural ribs running from base of intake manifold to the bottom of the block like the 91B blocks, threaded insert in the third screw location for the exhaust instead of tapped into the alloy. Shroud says 49C but it has the sloper manifold with the little Walbro carb like the 49E.
Your description fits my Mc49E exactly. It does not have the very rounded head fins like the Mc49M/C pictured on previous page.

===================================================

Terry,

The tech manual shows the 49(A) as having only one of the third port holes drilled so it is a two exhaust, four transfer and one down low across from the exhaust. The area under the intake is the same as the pics you posted. Intake and carb the same as the 49C.
I took another look at the sticker on the motor I have with the sloper and Walbro and the letter is nearly worn off and could be a "E" bit it sure looks more like it was a "C".
I have a NOS 49E coming to me so I will be able to compare and post info once it arrives.
Thanks again to all for sharing info.... with help and cooperation like this thread we can keep the McCulloch legacy alive well.
Regards,

Steve O'Hara

===================================================

by Terry Bentley

steveohara wrote:

Terry,
The tech manual shows the 49(A) as having only one of the third port holes drilled so it is a two exhaust, four transfer and one down low across from the exhaust. The area under the intake is the same as the pics you posted. Intake and carb the same as the 49C.

That one hole sould be about 1/4" diameter. It is on all saw motors that dont utilize the third port induction. I am guessing its just to vent the dead space, since the passage is blocked by the reed plate.

The two pics above are different on the intakes. One is just like the Mc5/6, the other is a later model with additional material below the early style gasket surface. Basically the same as pics on the Mc250 differences aa Scott posted on first page. The lower ribs can be milled out to open up large like the Mc7. If the Mc49 intake opening is exactly like the Mc5/6, the saw block of choice would be a 1-43. If it has the small opening with added material below, you have severeal options easily available from saws. The most common would be a Mc15. Another would be any particular Mc250 that happens to have the correct porting as the Mc49.
But that would be a roll of the dice without tearing the motor down.

====================================================

by steveohara

The tech manual drawing shows the version with the extra material like your second picture.
I have a block that is just like it but the head is removable... I think it is an I-40 saw motor.
Thanks again for the info.
Steve

====================================================

by Terry Bentley

Please reply back as to which saw motor you have with the extra material and removable head. You have my curiosity up.
The first pic without extra material is actually a 1-40 with removable.

====================================================