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Terry Byrne
New member
Username: 709byrne
Post Number: 1
Registered: 06-2014
| | Posted on Thursday, May 04, 2023 - 08:30 am: | 
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Can Anyone Identify This Unit From A Mianus 7.5 Hp?Where Would The Carburetor Attach To Said Engine?
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miro forest
Senior Member
Username: miro
Post Number: 1230
Registered: 11-2001
| | Posted on Thursday, May 04, 2023 - 08:51 am: |
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Based on what you have provided, I speculate that what you show is an air inlet valve into the crankcase, that would allow you to lean out the mixture .
That means that you likely have a mixing valve instead of a caburetor.
As the engine warms up and the engine speed increases after starting, a leaner mixture is needed .
As you slow the engine , you'll need a richer mixture. You would close this valve to make the mixture richer.
Modern carbs achieve this "automatically" with idle circuits built into the carb.
The body part on the other side of the knurled ring in your picture is probably a one-way valve.
A few more pictures might help sort this out |
Terry Byrne
New member
Username: 709byrne
Post Number: 2
Registered: 06-2014
| | Posted on Thursday, May 04, 2023 - 06:02 pm: |
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Miro, I Found This Engine In A Field;Been Laying There For 30+ Years.Rust Is Minimal,Had No Problem Removing Parts,Bolts,Etc.The Engine Is Not Seized;High Compression.
I`m Not Familar With Mianus.I Have Atlantic And Acadia Engines.This Mianus Has The Ignitor And Water Pump Assembly.
No Other Parts Except For That Air Inlet Valve.
From The Attached Pictures,Could You Tell Me What Else I Would Require To Possibly Have This Engine Running And Any Info As To Where I Might Find Such Parts.
Thank You. Terry
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miro forest
Senior Member
Username: miro
Post Number: 1231
Registered: 11-2001
| | Posted on Thursday, May 11, 2023 - 11:49 am: |
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Congrats on finding and recovering this beauty.
It looks lie you have the head off - clean out as much of the rust in the bore as you can. I would not suggest taking the engine apart just yet - assuming there is no "clinking" at either top dead centre or bottom dead centre.
It looks like you'll ne a carb for the engine - a Scheblr D, 1 in should work well. The Schedler cards are plentiful - almost any engine collector or gas engine club will have one to borrow.
The whole igniter assembly would have to be replicated - maybe some out there might lend you their minus assembly so you could do that work.
A less desireable option is to convert it you a spark plug ignition - you'd have to machine an adapter for that big port at the top of the cylinder. That greasy ring just behind the flywheel will give you the correct timing.
I could help you with the ignition box needed for the spark plug.
Miro
Miro
I assume that you how to deal with the head and the head gasket.
As for the ignition - that will be your biggest challenge. |
Peter Snow
Member
Username: psnow
Post Number: 7
Registered: 09-2012
| | Posted on Sunday, February 04, 2024 - 04:19 pm: |
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Maybe to late but I have one of these that the cast is no good but has all original brass for sale |
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