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Author Topic: OKMO Microcosm M91 Model Hit & Miss Engine  (Read 69 times)

Jim

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OKMO Microcosm M91 Model Hit & Miss Engine
« on: June 12, 2025, 10:23:15 pm »
Had a run of my OKMO Microcosm M91 Model Hit & Miss Engine

https://youtu.be/lRe70SQ2uUU
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Cheers.
Jim

Blue Heelers Model & Toy Steam Engine Room YouTube Channel -
 https://www.youtube.com/user/Blue123Heeler/videos

Raphael

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Re: OKMO Microcosm M91 Model Hit & Miss Engine
« Reply #1 on: June 13, 2025, 01:59:59 am »
Bonjour Jim,

Tour engine seems to run perfectly, did you enhance it ?

On mine, after a few moments of use, the crankshaft had taken some play and especially the flywheels no longer held on the crankshaft, so we improved this engine by replacing its worn needle bearings with shouldered bronze rings and made small flats on the crankshaft so that the flywheel retaining screws can be housed there.
In addition, we raised the gas tank by 15mm to help the carburetor work.
Besides this, I have successfully tested Alkylate 2-stroke gasoline:
https://youtu.be/BVW-0gibXKM
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Stoker

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Re: OKMO Microcosm M91 Model Hit & Miss Engine
« Reply #2 on: June 13, 2025, 03:10:10 pm »
Nice run Mate!

How's your trigger finger do'n now? Seems like you are using it okay.

Perhaps you could name that engine Jumpin' Joey or some such, the way it tries to Kangaroo around the table?    ;c)

My M90 is nicknamed The Creeper, as it slowly pushes itself across the bench when it's running!
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Jim

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Re: OKMO Microcosm M91 Model Hit & Miss Engine
« Reply #3 on: June 13, 2025, 08:16:42 pm »
Quote from: Raphael on June 13, 2025, 01:59:59 am
Bonjour Jim,

Tour engine seems to run perfectly, did you enhance it ?

On mine, after a few moments of use, the crankshaft had taken some play and especially the flywheels no longer held on the crankshaft, so we improved this engine by replacing its worn needle bearings with shouldered bronze rings and made small flats on the crankshaft so that the flywheel retaining screws can be housed there.
In addition, we raised the gas tank by 15mm to help the carburetor work.
Besides this, I have successfully tested Alkylate 2-stroke gasoline:
https://youtu.be/BVW-0gibXKM

G'day Raphael.....this engine is 'as is' from when I bought it 4 years ago. I was happy it started so easily after not running it for quite a while.
Your one is running very well.
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_______________________________________________
Cheers.
Jim

Blue Heelers Model & Toy Steam Engine Room YouTube Channel -
 https://www.youtube.com/user/Blue123Heeler/videos

Jim

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Re: OKMO Microcosm M91 Model Hit & Miss Engine
« Reply #4 on: June 13, 2025, 08:17:24 pm »
Quote from: Stoker on June 13, 2025, 03:10:10 pm
Nice run Mate!

How's your trigger finger do'n now? Seems like you are using it okay.

Perhaps you could name that engine Jumpin' Joey or some such, the way it tries to Kangaroo around the table?    ;c)

My M90 is nicknamed The Creeper, as it slowly pushes itself across the bench when it's running!

Finger is all healed up now!

They sure are jumpers these engines aren't they!
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_______________________________________________
Cheers.
Jim

Blue Heelers Model & Toy Steam Engine Room YouTube Channel -
 https://www.youtube.com/user/Blue123Heeler/videos

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