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Cox Engine of The Month
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"Cox .049 Marine inboard engine."

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All I know about the Wen-Mac Kart

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All I know about the Wen-Mac Kart Empty All I know about the Wen-Mac Kart

Post  rsv1cox Fri Oct 06, 2023 9:55 am

At first I had "buyers remorse". Why do I need another toy sit-around? I don't, but I have this natural curisority and I enjoy taking things apart to see what makes them tick. So, punch the make a bid button.

Turns out, I'm happy that I did. Crispy and needs help, but not as much as some.

This thing isn't tiny. With others for perspective.

All I know about the Wen-Mac Kart P1016326
All I know about the Wen-Mac Kart P1016325

The usual, sticky castor, broken mounts, locked engine and "Roto-matic" starter.

All I know about the Wen-Mac Kart P1016328
All I know about the Wen-Mac Kart P1016327
All I know about the Wen-Mac Kart P1016329

More later.
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Post  rdw777 Sat Oct 07, 2023 6:26 am

I had no idea Wen Mac made a cart like that…. Looks big…. I’ve seen the OK brand one with the .024…. Interesting!!
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Post  Ken Cook Sat Oct 07, 2023 7:35 am

I like the looks of the engine, similar to the Atwood Wasp. I know some parts interchange. I've never been successful with my version of these engines to use them. They're very problematic to start. The venturi is suspect on mine. It's extremely small and would offer reason to the engine's anemic state. I find these engines flood extremely easy rendering starting very difficult until cleared. This would be the cause for any engine, the Wen-Mac has me reaching for the sledge hammer. I don't own the Rotor-Matic versions as mine are strictly air. I also know there's a few different versions of these engines usually depicted on the case by numbers of the series. I also believe there's the thinnest paper gasket under the cylinder known to man. If this gasket goes, fuel draw and compression is compromised.
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Post  rsv1cox Sat Oct 07, 2023 8:00 am

Thanks Robert and Ken

I haven't seen the Ok version Robert, you have me looking.

And Ken the "Roto-matic" version is quite easy to start, in fact it's the best starter that I have seen on these small engines.  This one has a standard aluminum glow plug gasket.  I did not remove the head or backplate.  After Berryman's and hot soapy water/alcohol rinse it's clean and functions perfectly.  Why tempt fate.I have had bad experiences with these removing that backplate...........it ain't easy!!!!

Typical castor goo, got under everything.  I just dumped it in Berrymans and painted it on, let it sit for about 15 minutes and washed it off with warm soapy water.  Rinsed and dried.

All I know about the Wen-Mac Kart P1016330
All I know about the Wen-Mac Kart P1016332
All I know about the Wen-Mac Kart P1016331

Mounting posts for the engine module were broken, I saved one and replaced the other with posts that Jason made for me years ago.  

All I know about the Wen-Mac Kart P1016335

Engine cooling fan is strange.  Red plastic is made up of two parts and spin independently.  Flywheel is solid steel and heavy.  Cox wrench specially drilled to accept the larger Wen Mac shaft.

All I know about the Wen-Mac Kart P1016340
All I know about the Wen-Mac Kart P1016339


All I know about the Wen-Mac Kart P1016337
All I know about the Wen-Mac Kart P1016336
All I know about the Wen-Mac Kart P1016338
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Post  getback Sat Oct 07, 2023 9:53 am

The fan looks like one that would catch air and spin with a force out the back for cooling ?/ Interesting that its independent from the CS . Damn! That is one bigun all i can compare it to is the Prop Rod Check with own eyes Cleaning up good !
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Post  rsv1cox Sat Oct 07, 2023 10:37 am

getback wrote:The fan looks like one that would catch air and spin with a force out the back for cooling ?/ Interesting that its independent from the CS .  Damn!  That is one bigun all i can compare it to is the Prop Rod Check with own eyes  Cleaning up good !

Thanks Eric, it's a work in progress.

And Robert.............Wow $749.99 A little out of my comfort zone. Cute though. Must be the engine and rare, the W/M blows it away for complexity.

https://www.ebay.com/itm/305150647035?hash=item470c655afb:g:0e4AAOSwoyxlC7-L&amdata=enc%3AAQAIAAAA4JlwupSt%2BvrvtDg2pjBbpt694EFp0EpaG3%2Fo9a0wNy2em%2FH%2FcXRkyaUYZFPo2KTCIGnNgwoyyKggMIcyBW2SVM01fHNdVt9ca9N04rG3ja%2FX%2BFWg18eWmeVUbc2ku5dK%2BPhFyUNwVuFJNz5MMIH3Ej9IroPF1PssF%2BfqficBqOEiz6A1TrxsNfpBWN8VYaVOA44vK1f8eI203fQoXQCfbkYwq6uc2v7DppQSBy3%2FI%2FKi45EWpLyw2iVHlaX%2F18AZHA6s%2B8uyb93M7B5OVv3LqQ%2BfA0jtIim%2Fd5hjzyf7%2FJ3o%7Ctkp%3ABk9SR_zInazhYg

All I know about the Wen-Mac Kart Ok_cub15
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Post  getback Sat Oct 07, 2023 12:03 pm

I have seen a few of those on the Bay that's Hi usually around 350 will get you one Very Happy
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Post  rsv1cox Sat Oct 07, 2023 12:26 pm

getback wrote:I have seen a few of those on the Bay that's Hi usually around 350 will get you one Very Happy

I was just looking on ebay for the part on the W/M Kart that I'm missing. I guess it's this steering mechanism.

Mine

All I know about the Wen-Mac Kart P1016341

ebay offer

All I know about the Wen-Mac Kart Kart_s10

Bad part is - it's connected to a partzer sale.  $100 or make an offer.  I made two $75 and $85, both declined.  So what..........I bit at $100.  Actually it's complete minus the second red foot rest.  Looks like the seller bought/found the replacement part to fix the broken steering mechanism presently on the Kart and never installed it.  See the broken off red foot rest.

All I know about the Wen-Mac Kart Kart_m10
All I know about the Wen-Mac Kart Kart_e10
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Post  Ken Cook Sat Oct 07, 2023 2:44 pm

When I see plier marks on a cylinder it makes you want to just punch someone in the face.
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Post  rsv1cox Sat Oct 07, 2023 3:09 pm

Ken Cook wrote:                 When  I see plier marks on a cylinder it makes you want to just punch someone in the face.

Agreed!!!!!!!

Especially on this one.  Beer barrel cylinder with a standard glow plug.  Very strange in W/M world and I haven't seen another one.  I wonder what Mk it is.  Anyone?
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Post  Ken Cook Sat Oct 07, 2023 6:30 pm

Bob, I think you have a hybrid there. I mentioned above about the ability to interchange with Wasp engines. Your engine certainly appears to have a Wasp cylinder head on it.
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Post  GallopingGhostler Sat Oct 07, 2023 6:35 pm

Ken Cook wrote:Bob, I think you have a hybrid there. I mentioned above about the ability to interchange with Wasp engines. Your engine certainly appears to have a Wasp cylinder head on it.
That is interesting, so it is possible for some parts swapping. I searched the Sceptre Flight engine archives, and couldn't find a beer barrel cylinder fin Wen Mac.
rsv1cox wrote:
Ken Cook wrote:When I see plier marks on a cylinder it makes you want to just punch someone in the face.
Agreed!!!!!!! Especially on this one. Beer barrel cylinder with a standard glow plug. Very strange in W/M world and I haven't seen another one. I wonder what Mk it is. Anyone?
I have found by carefully swedging the raised dimples with a smooth jaw needle nose or duck bill pliers, then carefully dressing with a file will make those look less noticeable. Also, the flaws may contribute to a drop in value, which means the item sells for less, which can make it fit one's budget.

I've done that to a couple engines, cylinder cooling fins and aluminum prop thrust plates. After dressing, they don't look as bad and helped to restore their looks with a sense of usefulness.

If it is too pretty, then it is less likely to be used. lol!
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Post  Ken Cook Sun Oct 08, 2023 5:03 am

George, I believe the Holland Wasp used what you refer to as the beer barrel head. I have both and sometimes the engines even had a H designation on the case to dictate Holland. The Atwood used a head which was more of a flat on the top and head tapered, this would be similar to the Wen Mac. Mark Bosen has shed light on this over the years. There's several variations of these engines. I own two of the Atwood Shrike .049's and these also have a beer barrel shaped cylinder. The head on the Shrike was a one piece glowhead which changed .049 power forever.
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Post  rsv1cox Sun Oct 08, 2023 7:57 am

It will be interesting to see once I get it, should be soon as it's pretty close in Virginia.

Finished the Kart.  Engine has a nice compression pop, I cleaned out the fuel tank and added new fuel line saving the original nipple.  No more castor goo.  Added the missing steering column. Ka Bob Skewer painted yellow.  Looks only the front wheels do not turn, solid axle.  Has a bridle, but also fixed for straight-line string operation.

All I know about the Wen-Mac Kart P1016342

Now where to place it.  This thing is out-sized.  Won't go North/South.  I had to lose the Sandblaster and a Prop Rod to get it to fit.

All I know about the Wen-Mac Kart P1016343

Now back to repairing the Cox Army Locomotive (someone installed the trucks backward) and pay some attention to the neglected profile P-38.

All I know about the Wen-Mac Kart P1016344
All I know about the Wen-Mac Kart P1016345
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Post  getback Sun Oct 08, 2023 8:18 am

I think Ken is right from what i have seen they came with the MARK V engine >> https://www.worthpoint.com/worthopedia/gas-power-jr-kart-amf-wen-mac-parts-1814936449 and that don't look like one > https://www.ebay.com/itm/295807364241
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Post  GallopingGhostler Sun Oct 08, 2023 9:57 pm

getback wrote:I think Ken is right from what i have seen they came with the MARK V engine >>  https://www.worthpoint.com/worthopedia/gas-power-jr-kart-amf-wen-mac-parts-1814936449 and that don't look like one > https://www.ebay.com/itm/295807364241  
Eric, from your first link:
All I know about the Wen-Mac Kart 2023-168
Ebay photo.

The aluminum cylinder fin cover for the sleeve is slightly tapered, but definitely not beer barrelled.

Here's the same model Mark V engine in a photo that is a bit clearer:
https://www.ebay.com/itm/235162019850 AMF Wen Mac .049 Mark V - Vintage Model Airplane Nitro Fuel Engine

All I know about the Wen-Mac Kart S-l16035
Ebay photo by seller jmc-go.
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Post  rsv1cox Mon Oct 09, 2023 8:32 am

Yes, the standard Wen Mac engines cylinder is "top heavy" where the engine is question is tapered at the top. Unusual.

In the past I have using the glow plug chucked it up on the drill press and used a fine jewelers file and 400 grit paper to remove the tool marks. Not sure how or if I will deal with this one.
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Post  GallopingGhostler Mon Oct 09, 2023 10:23 pm

I am more of a perfectionist, so I can get by with various hand files, emory boards, pliers, etc. without turning the cylinder to true the fins. Each has their preferred methodologies and practices.

I'm just amazed Bob, how you are able to turn sow's ears into silk purses. Very Happy
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Post  rsv1cox Thu Oct 12, 2023 3:52 pm

Mystery engine:

All I know about the Wen-Mac Kart P1016361
All I know about the Wen-Mac Kart P1016359
All I know about the Wen-Mac Kart P1016360

Things that make you happy.  For most it's a night out or a new something.  For me it's something old and beat up.  With this second Wen Mac Kart it was like Christmas.  Seller had wrapped each piece individually in bubble wrap.  I smiled as each piece unwrapped seemed worse than the piece before.  Smile

Worst part is the engine mount, all four mounting posts are broken off.  I will have to make a new one out of wood and join it with the fuel tank whose fuel nipple happens to be intact, rare for these.  

All I know about the Wen-Mac Kart P1016363
All I know about the Wen-Mac Kart P1016362
All I know about the Wen-Mac Kart P1016364

Cox Semi trailer came at the same time, axles broken along with couplers. It's ok I have a NIB coming.  The Kart is more complete than the first with the steering shaft and a mount to lift the rear end off the ground for starting/running.
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Post  rsv1cox Fri Oct 13, 2023 6:41 pm

Cleaned the cylinder up a bit. Drill press chucked up using the glow plug. Spun with 100 grit w/d paper, then 400/800 and fine steel wool. Went as far as I dared but got rid of 90%. Still needs some detail work.

All I know about the Wen-Mac Kart Tool_m10

All I know about the Wen-Mac Kart P1016375
All I know about the Wen-Mac Kart P1016376
All I know about the Wen-Mac Kart P1016374




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Post  Mark Boesen Sun Oct 15, 2023 12:07 am

Great photos and article Bob!

Yep, its a Wasp Head. LMK, if you need a good one?

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Post  rsv1cox Sun Oct 15, 2023 6:59 am

Mark Boesen wrote:Great photos and article Bob!

Yep, its a Wasp Head. LMK, if you need a good one?


Thanks Mark.  Maybe, I'll let you know.  Meanwhile............

I have a bid in on these two gems:

All I know about the Wen-Mac Kart Wm_v_210
All I know about the Wen-Mac Kart Wm_iii10

Check the cylinder on the left and the V (5?) marks.....................Very similiar to the Kart engine.
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Post  Mark Boesen Sun Oct 15, 2023 11:24 pm

lol, are they paying you?
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Post  Mark Boesen Sun Oct 15, 2023 11:31 pm

yep, that's odd to see Atwood head on a Wen-Mac twice like that...
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Post  getback Mon Oct 16, 2023 4:59 am

Mark Boesen wrote:lol, are they paying you?
lol! lol! lol! Where you been Mark . thats the way Bob likes them he will work his magic on them ! This Site Rocks!
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