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Small Air Cooled Gasoline Engines Briggs & Stratton, Clinton, Lauson, Maytag, Nelson, Wisconsin and other small air cooled engines. Sub forums for mowers, scooters and powered eqipment.

Small Air Cooled Gasoline Engines

Lauson model RSC 611


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  #1  
Old 10-09-2012, 03:27:28 PM
360willys 360willys is offline
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Default Lauson model RSC 611

I just bought this engine yesterday for 20 dollars and am trying to find out info on it. I believe it is a military engine but thatís about all I know. Is that a fuel pump on the side? Really all I know is itís in decent condition and I smell something stronger than gasoline in the oil. It's very interesting and Iíd like to get it running but am trying to learn about it first. Sorry to bother everyone I'm new at this. I'm only 21 years old so I really donít know anything about lauson engines.
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  #2  
Old 10-09-2012, 05:57:06 PM
old 6bhs old 6bhs is offline
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Default Re: Lauson model RSC 611

Quote:
Originally Posted by 360willys View Post
I just bought this engine yesterday for 20 dollars and am trying to find out info on it. I believe it is a military engine but thatís about all I know. Is that a fuel pump on the side? Really all I know is itís in decent condition and I smell something stronger than gasoline in the oil. It's very interesting and Iíd like to get it running but am trying to learn about it first. Sorry to bother everyone I'm new at this. I'm only 21 years old so I really donít know anything about lauson engines.
although i've never seen a lauson marine engine, it sure looks like what this one was used for, and yes, that's a fuel pump on the side
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Old 10-09-2012, 06:17:00 PM
mschreiber mschreiber is offline
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Default Re: Lauson model RSC 611

thats not a marine oil sump/base, its got shielded ignition more likely some kind of radio genset. we believe with that single digit (5) its built 1945. marine motors don't have governors. i believe there are some pics of lauson rsm's marine engines. good luck.
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Old 10-09-2012, 06:36:51 PM
BWegher BWegher is offline
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Default Re: Lauson model RSC 611

RSC is the basic model. Somewhere there is a list of the version numbers that will tell you the details for the 611. Thats not a common version number.
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Old 10-09-2012, 07:17:46 PM
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Default Re: Lauson model RSC 611

You''ll find just about all there is to know over on Craig's page here http://lausonsmallengines.com/
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Old 10-09-2012, 07:30:15 PM
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Default Re: Lauson model RSC 611

That second spark plug lead would indicate that it is probably from some kind of heater. The second plug would fire the fuel mixture like a modern 'torpedo' heater.
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Old 10-09-2012, 08:27:24 PM
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Default Re: Lauson model RSC 611

Welcome to the Stak 360willys, lots of info and knowledgeable folks here.

Patrick
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Old 10-09-2012, 09:07:32 PM
360willys 360willys is offline
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Default Re: Lauson model RSC 611

Thank you everyone. Im just worried now on why there is gas in the oil.

---------- Post added at 07:07 PM ---------- Previous post was at 06:47 PM ----------

Also would I be correct to assume theres not very many of these engines left?
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Old 10-09-2012, 11:58:53 PM
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Default Re: Lauson model RSC 611

Gas in oil could simply be a stuck float that allowed it to over flow or bad seals inthe fuel pump... a lot or few of those engines? Hard to say, once I think an air cooled engine is rare, I come across a dozen more. Chances are if it was for the military there are or where a ton of them... just where they are now could be anyone's guess...
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Old 10-10-2012, 11:31:45 AM
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Craig DeShong Craig DeShong is offline
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Default Re: Lauson model RSC 611

You guys have it covered no reason for me to re-state.

The RSC is the most common Lauson you’ll find though I can’t say as I’ve seen one of these before now. Recently I saw one on eBay (I think?) and also one on Craig’s list (might be the same engine?). Is/was either of these your engine?

I’m confused regarding the dual ignition that John states. The specification sheet for the RSC states that the RSC611 shares the same ignition as the very common RSC591- an example of which I have and which only has one spark plug wire.
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Old 10-10-2012, 01:31:24 PM
360willys 360willys is offline
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Default Re: Lauson model RSC 611

Yah I got it on craigslist. I tried to see if it would fire with a little ether but no suck luck yet. Probibly will be a winter project.
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Old 10-10-2012, 01:38:20 PM
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Default Re: Lauson model RSC 611

Just a 'shot in the dark' but in the UK (and maybe the USA?) some of these Lauson engine's were mounted into WW2 Military Tank's and had a device fitted near the carb to provide a smokescreen so that they were hidden from the enemy. I think that oil from the sump was used, they had an extra deep sump, I have seen one engine 'in the flesh' and know of a tank fitted with one, could the second sparkplug etc be a part of that device?

Pete.
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Old 10-10-2012, 03:12:24 PM
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Default Re: Lauson model RSC 611

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Originally Posted by 360willys View Post
... I tried to see if it would fire with a little ether but no suck luck yet...
Be sure to ground that extra spark plug / spark plug wire. Nothing kills a coil like generating a high voltage spark and not giving it a path to ground.
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Old 10-10-2012, 04:26:03 PM
Bill Sherlock Bill Sherlock is offline
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Default Re: Lauson model RSC 611

I would caution against the use of ether to start a gas engine. Use carb cleaner in a spray can instead. Less chance of bending a connecting rod or other damage if you get too much into the cylinder. The ether being sold now may not be as potent as the ether in the past, but why take a chance?

Bill
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Old 10-10-2012, 08:57:53 PM
360willys 360willys is offline
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Default Re: Lauson model RSC 611

Ussally I do have carb cleaner to use but was at my grandpas and its what he had. Ussally I only use ether on very stubburn engines. Like I got a old clinton saw which if I dont give it a short puff wont start.
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Old 10-10-2012, 09:20:24 PM
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Default Re: Lauson model RSC 611

I would avoid ether in any engine with an aluminum piston as it can burn hot enough to burn whole in a piston (I've seen it done). Long ago Polaris would void all warranty if ether was suspected, I remember similar warnings from Briggs and Techumseh. Polaris recommended a small squirt bottle or a small oil can works well, filled with premix gasoline that could then be shot right into the carb or spark plug hole with no fear of the ether risk, plus it provides lubricati8n for a potentially dry top end. If a small gas engine will only start on ether, it needs further investigation into why...
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Old 10-10-2012, 10:43:35 PM
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Default Re: Lauson model RSC 611

Well its a old D35 clinton and the carb is a little gunked up. But I dont wanna tear it apart cause there rare. IT runs good but she needs a little kick in butt to get her started.
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