Briggs and Stratton 4hp 187cc Model 112292 0707 Project

HyPerformance

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My son recently dug out an old BS engine from the shed, hasn't been fired up in 20 years. And to my amazement, it turned and will fire up with some starter fluid or a splash of fuel into the carb. However, due to either gummed up tank, lines, or carb -- it won't fire more than 10 seconds at a time. I'm just grateful it wasn't locked up. It looks rough, the tank is rusted beyond belief. If it can dry rot on the motor, it's dry rotted. If it can rust, it's rusted. If it can cause tetanus, it'll cause tetanus. Lol.

So, a few quick points if like to make before I ask a few questions:

I'm not buying another motor. If there's no rebuild kits that I can throw together online, then this engine will be recycled. I posted on another site and people decided they'd tell me "what I should do".. which always includes stuff like, "throw it away and get a better motor."

I fully realize what this motor is, and what it isn't in terms of value and performance. (which is -- not much).

But the kid is excited to rebuild it and use it as I did as a kid. This engine was on my first gokart I ever owned back in the late 80s. My dad got it for me, it was made in 1985, June 12th. So it's got sentimental value to me.

What I'd like to know is this:

As I search for parts for it, what am I looking for? Is this a series of engines that have somewhat interchangeable parts? Say, a small block Chevy for instance. If I'm looking for an intake, they pretty much all fit if they are SBC's. Cams, and heads too. So what is the type of BS engine I have? Is this the flathead 5hp type? Does any of this make sense?

I'm looking for rings, bearings, carbs, heads... Even better rod and crank if they are made. And while I'm by no means "rich"... Money really isn't an issue. I'll spend whatever it takes, within reason, to get this thing back in top shape, and will do it either completely stock, or with a mild performance boost (obviously this engine isn't meant to be a performer. I'm realistic about it's potential. If I can make it even a 4.5hp, that's a 12.5% boost. Higher compression has been one of my go to mods throughout the years. I'm unsure if I can mill the head on this and still maintain its integrity. I own a porting business, and have been porting intake and exhaust components for 20 years. I can already see a few areas of improvement that can be made with this set up. I'm dying to find a cam that has just a couple of more degrees duration, perhaps a tiny amount of higher lift too. Anyways...

Basically the only issue I have is knowing what works with this engine, and what doesn't. And more importantly, where to find it at!

Any help along these lines would be very much appreciated.

As I write this, I'm looking out in the field beside my house and I can still see the remnants of the dirt track I made 30 years ago. The nostalgia makes me emotional. And watching my son go around that same course in a few weeks will be worth whatever I need to do to make it happen.

God bless y'all.



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Brianator

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I dont know what (if any) decent cams are available for that, someone else here will though I'm sure BUT if all else fails.... have the stocker reground.
 

landuse

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Welcome to the forum!!

Post some pics of the engine, and look for the serial number (or code) on the engine. It is often stamped on the starter cover somewhere. We can then ID the engine for you and tell you where to get parts

BS engine parts are pretty plentiful, so i think you should be ok rebuilding this engine
 

HyPerformance

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Welcome to the forum!!

Post some pics of the engine, and look for the serial number (or code) on the engine. It is often stamped on the starter cover somewhere. We can then ID the engine for you and tell you where to get parts

BS engine parts are pretty plentiful, so i think you should be ok rebuilding this engine
It's listed in the subject I think. It's a Briggs Type/model 112292 0707. Built June 12th 1985. A 4hp 187cc flathead style, horiZontal shaft.

As far as the cams go, I do my own cam grinds, but I've never done one for a single cylinder small engine. Only pushrod cars. It'd be nice to find a cam that would simply be plug and play.. but I'm open to regrinding.

As far as what I'm looking for, I'd like to know if I can simply mill the heads for a bit of compression. Are their larger valves I can grind/install. Should I just stick with the stock carb and rebuild it, or go for a better one? How much back pressure is needed on the exhaust for optimal power.. can I install a straight pipe for a power boost, or does it need to have some sort of silencer for back pressure?

And as far as the ignition goes... Are their better coil/Magneto's? Or does the stock one provide plenty of juice?

Plugs? Rebuild kits with rings, bearings, gaskets, etc.

Att the end of the day, it's not as important that I get an extra 1-2 horsepower out of it, as it is that it runs, starts easily, and provides loads of fun for my son. But with that said, I'd love to find a few pieces here and there, and make my own when needed, that'll give him maybe 5-6hp out of this little engine.

Because it's a 187cc, that's pretty bigger for a 4hp motor. That tells me that it's got a bit of room to grow with the right mods. Considering I see motors that push 8hp with similar displacement. The cam, carb, and ultra low compression are holding this sucker back.

Anyways, thanks for the response thus far. I'm super grateful, and I can't wait to get started on it (perhaps today). I'm just waiting on someone to provide me a great parts source online, and I should have this "bad boy" ready to go in the next week or so.

After the engine is rebuilt, I will need further help picking a clutch and proper sprocket ratios for it's installation.

Thanks again. I'm extremely grateful that you all are here and answering my questions.

God bless yall. Stay safe during this horrible period of time we are living in.

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Budget GoKart

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That's awesome an engine with history is always worth saving no matter the condition! For example if I found my 3.5hp I used to have I would do whatever it takes to get it perfect for the kart it came off of (which I got back!)
 

HyPerformance

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Here's pics of it, and the numbers. model 112929, Type 0707 , date 850612.


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HyPerformance

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Nope, it actually fires up first pull with a bit of gas down the carb. It's been sitting in the back of my shed. Was my childhood go-kart motor. It's 35 years old.

Come **** or high water -- it'll be my son's go-kart motor by the first week of May.

Just need somebody to point me in the direction that I'll find the parts I need.

-Rings*
-Bearings*
-Gaskets*
-Carb (or rebuild kit)*
-Exhaust
-Cam
-Piston
-rod/crank
-High compression head.

*Denotes the must haves. Exhaust, cam, piston, rotating assembly, and head are like to haves.

I've uploaded the pics and all the numbers. Now, where do I find the parts? I've searched by model number and type, but have been rather unsuccessful. I need to know the short hand name/series for this motor, and what other motors by Briggs would have interchangeability with the parts.

I'll do a photo diary of the progress over the next week or so, and a video of it being fired up once completed.

Any ideas?


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jmaack

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what is the second smaller shaft for? never seen one like that. kick start?
 

mckutzy

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Small shaft is probably attached to the cam... often these were the driving shaft to move the mower at a slower rate...
 

Dingocat

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Small shaft is probably attached to the cam... often these were the driving shaft to move the mower at a slower rate...

And the oposite direction. They're usually on snowblowers and tillers bc they can give it reverse.
 

jmaack

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makes sense but looking at old pics I see that a kick start lever attaches close to there.
we see snow in pictures here so I'll take your word on it. neat old engine.
 

mckutzy

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Oh right .. the reverse cam direction...

The kick or lever starts were on the briggs prior to the 50's I think when they stoppped making those versions...
The kickstart engines were typically on washing machines, till the electric home versions were more convenient to be used..
 

jmaack

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Oh right .. the reverse cam direction...

The kick or lever starts were on the briggs prior to the 50's I think when they stoppped making those versions...
The kickstart engines were typically on washing machines, till the electric home versions were more convenient to be used..

yep and way older engines. then I came across the ones for the tecumseh engines. I'm gonna have to find me an old Briggs.
 

2000se

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Oh my.. the nostalgia. I so remember those metal gas caps and the that choke on the carb..Great find.
 
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