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Cox Engine of The Month
September-2021
crankbndr's

"Cherry Bomb" .051 engine

More info on this engine!




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Post  Mike1484 Thu Jul 11, 2019 11:06 am

I had a similar experience with a loose back plate . Remove tank and see if the round back plate is loose or missing a gasket .

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Post  GWILLIEFOX Thu Jul 11, 2019 5:27 pm

The Power Kit instructions give the correct gasket information. There is a fibre gasket behind the rear cover cover. This must be in place and the rear cover snug. The is one (1) copper gasket between the lower cylinder and the crankcase. This must be in position and the cylinder snugged down. It s easy to mount this gasket off center, there isn't a good locating setup. Hold the cylinder upside down, center the gasket and screw on the crankcase; once snug you can't turn it upright and tighten the cylinder. There are 2 to 4 head casets between the top of the cylinder and the hex cylinder head:
use 2 gaskets if you live above 4,000 feet
use 3 gaskets if you live between 2,000-4,000 feet
use 4 gaskets if you live lower than 2,000 feet.

The original Cub used a long glow plug.
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Post  getback Thu Jul 11, 2019 6:14 pm

I didn't read all the post yet but this pic show green on the outside of the threads can you imagine what's inside ,.,.,. The disappointing OK Cub - Page 2 P7100010
And this does Not ,.,.,., The disappointing OK Cub - Page 2 73db4c10                                             The disappointing OK Cub - Page 2 Img_2102  4th of July Flag 4th of July Flag 4th of July Flag 4th of July Flag Babe Bee .049 Babe Bee .049 Babe Bee .049 Babe Bee .049 lol! lol! lol! lol! I Love This Forum! I Love This Forum! I Love This Forum! I Love This Forum!
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Post  rsv1cox Thu Jul 11, 2019 6:22 pm

OK (pun intended) you guys got me all excited to try this engine again, but...…………

I just googled (well binged) OK Cub model engines and went through a bunch of pictures finding a total of none like mine. Until someone shows me a picture of yours that is identical to mine I'm thinking I have a million dollar collectable one-off here.

Bob
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Post  rsv1cox Thu Jul 11, 2019 6:25 pm

@getback wrote:I didn't read all the post yet but this pic show green on the outside of the threads can you imagine what's inside ,.,.,. [/url]  4th of July Flag 4th of July Flag 4th of July Flag 4th of July Flag Babe Bee .049 Babe Bee .049 Babe Bee .049 Babe Bee .049 lol! lol! lol! lol! I Love This Forum! I Love This Forum! I Love This Forum! I Love This Forum!

That green equals dollars Eric should anyone desire this valuable one-off engine...……………..
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Post  getback Thu Jul 11, 2019 7:31 pm

I got a dollar W/free shipping Fireworks lol! lol! lol!
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Post  Oldenginerod Thu Jul 11, 2019 8:03 pm

@rsv1cox wrote:OK (pun intended) you guys got me all excited to try this engine again, but...…………

I just googled (well binged) OK Cub model engines and went through a bunch of pictures finding a total of none like mine.  Until someone shows me a picture of yours that is identical to mine I'm thinking I have a million dollar collectable one-off here.  

Bob
Sorry Bob, you don't have anything special there. I think I have three of them. If it has no size marking, or .049, it's an .049 "long stroke". The .074 is nearly identical, but should have .074 on the case. Pretty much everything in this .049 engine is different to the .049B which followed. Even the head is different due to a different size bore. As mentioned, it takes a long plug where the "B" has a short.
Sorry, I have no pictures of mine on hand.
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Post  Oldenginerod Thu Jul 11, 2019 8:14 pm

Thanks to Mark Boesen, these pictures are from the old .049 Collectors site.  If the link works, it shows clearly the difference between the models.  The info on the .074 picture states that it has the same case and stroke as the .049, just a larger bore.

.049
The disappointing OK Cub - Page 2 Screen10

.074
The disappointing OK Cub - Page 2 Screen15

https://groups.yahoo.com/neo/groups/049Collectors/photos/albums/408072958


Last edited by Oldenginerod on Thu Jul 11, 2019 9:31 pm; edited 1 time in total
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Post  ticomareado Thu Jul 11, 2019 8:24 pm

On the long stroke Cub .049 I believe we can divide them thusly: First release Arden plugs, later release with OK long plugs and early runs with serial numbers, later without. Then maybe some NV variants.
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Post  GWILLIEFOX Thu Jul 11, 2019 9:00 pm

@rsv1cox wrote:OK (pun intended) you guys got me all excited to try this engine again, but...…………

I just googled (well binged) OK Cub model engines and went through a bunch of pictures finding a total of none like mine.  Until someone shows me a picture of yours that is identical to mine I'm thinking I have a million dollar collectable one-off here.  

Bob
The disappointing OK Cub - Page 2 Oks_ca10
In the center on top of th3 yellow OK box
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Post  rsv1cox Fri Jul 12, 2019 6:33 am

@getback wrote:I got a dollar W/free shipping Fireworks lol! lol! lol!

Ok...…….again.

Considering the above, I have one dollar do I hear two...…………Smile

Bob
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Post  ticomareado Fri Jul 12, 2019 6:52 am

That "yellow box" originally had a Cub .049 w/ Arden plug and prolly a ser. #
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Post  GWILLIEFOX Fri Jul 12, 2019 9:48 am

@ticomareado wrote:That "yellow box" originally had a Cub .049 w/ Arden plug and prolly a ser. #
Correct. And it didn't have a tank.
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Post  rsv1cox Fri Jul 12, 2019 10:19 am

@GWILLIEFOX wrote:
@ticomareado wrote:That "yellow box" originally had a Cub .049 w/ Arden plug and prolly a ser. #
Correct.  And it didn't have a tank.

Nice assortment Bill. I have the boxed example on the right, but that's it. From time to time I see the others come up on ebay but I resist the urge.

What's the sparker on the left and does it have an OK Cub connection?

Bob
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Post  Ken Cook Fri Jul 12, 2019 3:47 pm

Looks like a Forster .99. We had one running at the field last week. I have a plane with a Drone .29 converted to glow which we might squeeze the Forster into.
https://www.facebook.com/PhillyFliersCL/videos/vb.513140418756097/645005299244252/?type=2&theater
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Post  GWILLIEFOX Fri Jul 12, 2019 5:08 pm

@rsv1cox wrote:
@GWILLIEFOX wrote:
@ticomareado wrote:That "yellow box" originally had a Cub .049 w/ Arden plug and prolly a ser. #
Correct.  And it didn't have a tank.

Nice assortment Bill.  I have the boxed example on the right, but that's it.  From time to time I see the others come up on ebay but I resist the urge.

What's the sparker on the left and does it have an OK Cub connection?

Bob[/qxuote]
I pick3d up the 4 Cubs, the mini Dooling 29, and the Forster 99 at the Cabin Fever show last February.  The 99 is a pre WW 2 version.  The Forster  has no connection to the cubs.  Here is the case
The disappointing OK Cub - Page 2 Img_5810
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