old B&S 3 hp engine

[zakman]

hey, i just found out last year that i love small engines, i was wondering how to take off the gov and hook of a throttle.



thanks

[psycho_builder]

what is the engine from that you are using?

[zakman]

i have no idea but its old enough to have an oil bath...the logo on it is the diamond and black and white, so i dont know how old or what model number it is

[Kenny_McCormic]

Oil bath? If its old enough to have an oil bath air cleaner I wouldnt mess with it.

[zakman]

it runs great though, idles well, easy on gas...

[oscaryu1]

That's a Briggs 2HP. Most likely a common 60102 model. Oil bath are on all the 2HP's I know of.

3HP's use a more complex diaphram carburetor + much bigger fuel tank, as with a foam air filter.

[zakman]

is there anything i could do to make it preform better, and attaching parts for go kart making?

[Affair_driven]

What size is shaft? 1/2 inch or 5/8 inch?
Appears to be a 5s (rated at 1.0 hp) or a 6s (rated at 1.5 hp).
May possibly be a model 8 (rated at 2.5 hp) but carb and blower housing is wrong.
What does id plate say?

[Kenny_McCormic]

Wait till Russ sees this, he should know.

[oscaryu1]

Oh whoops, my bad. Affair driven is correct. It's a 5s/6s model. Didn't notice the shroud type. Darn box!

[Kenny_McCormic]

Thats an antique, not kart suitable.

[JerryAssburger]

As a teenager, I tried to press into use a B/S 5s on my minibike, and although it worked, I couldn't wait to get my less-old 6b back up and running (messed up magneto/coil). These things just weren't very powerful, and as a "kick-in-the-performance-groin" they were heavier than their more modern KoolBore counterparts. As stationary utility motors, they excelled.
I have two of them, and although I'll never use them in a project- I'll always keep them.

[oscaryu1]

They look so cute :)

The intake ports are TINY though, I'd love to see a "racing" 5s/6s. Now... where can I buy a CNC, mill, and lathe? :p

[jr dragster Tyler]

CNC mill and Lathe. I just sent them to you in a envelope. CNC mill is 180 grand+ and Lathe is around there.

[ZnsaneRyder]

WOW, without the milk-crate, that engine in the picture looks EXACTLY like engine I just scored from an old edger at a yard sale!!! Air cover and everything looks just like it, and it gets oil in the air filter after running it for a while. The engine cover is SO rusty that I can not tell anything about it, but it runs and idles great!

How old are these? 20, or 30 years old? So how many HP? I see 1.0, 1.5, and 2.5HP mentioned, but does anyone know for sure? I'm not worried about it being too weak at all, as I'm putting it on a new bicycle trailer geared to go only 25mph, but it would be nice to have a clue of the HP.

Also, it appears to have a 5/8 shaft, so it should fit a clutch.

[ZnsaneRyder]

Zakman, good luck with your engine, I'm sure you will put it to good use. If it's not powerful enough, there is a 2.5HP 79cc OHV engine at Harbor Freight tools that would do, but I would try to use your old engine first.

Anyone know how much HP these old B&S have?

[JerryAssburger]

Stick a long screwdriver down the sparkplug hole and measure the stroke. If it's 1.5", then it's a "5", which is good for 1- 1.5hp. If the stroke is 2", then it's a "6", which is in the 1.5- 2 hp range. These motors were built in (I think) the late 40's to late 50's.
Not real "performers", but interesting, none-the-less.

[Affair_driven]

6S, 6SFB, 6SR6 1.2 to 1.6 hp @ 2200 to 3200 rpm
5S .83 to 1.00 hp @ 2200 to 2800 rpm
Built 1949 through 1957. First horizontal aluminum block built 1955 and was a 6bhs.

[ZnsaneRyder]

According to this forum thread that engine may be a 6S: http://www.smokstak.com/forum/showthread.php?t=20445

Here's the 5S and 6S engines.

REMOVE THE MILK CRATE AND TAKE MORE PICS PLEASE!
:useless:

[ZnsaneRyder]

The metal fan cover on mine doesn't have the same shape as these engines, it's more square at the top near the cylinder and round at the bottom. It's probably a variation of the 6S.

1HP-1.6HP should be enough for slow speeds right? I was figuring, for Zakman's go-kart, or my bike trailer, that 3600RPM at 20 or 25mph should be a proper gearing. Any input on this?

[BradenM]

I'd take the time to restore an engine like that. I'm getting an old villiers of a friend, lucky to do 1000rpm, and I'll be restoring that to factory specs.

[ZnsaneRyder]

Are these old engines worth a lot of money?

[Kenny_McCormic]

Not a lot(that I know of, Russ wil probably prove me wrong), but that isnt justification to mess with one.

[jr dragster Tyler]

Stick a long screwdriver down the sparkplug hole and measure the stroke. If it's 1.5", then it's a "5", which is good for 1- 1.5hp. If the stroke is 2", then it's a "6", which is in the 1.5- 2 hp range. These motors were built in (I think) the late 40's to late 50's.
Not real "performers", but interesting, none-the-less.

Or use a caliper.:cheers2:

[JerryAssburger]

Or use a caliper.

...oh yeah....!
You don't know how many used corn-dog sticks I've lost down sparkplug holes.... that's how I ruined Grandma's Plymouth!

[Russ2251]

Are these old engines worth a lot of money?Only if it's NOS (New Old Stock), and would have to find the right buyer. Check Ebay. There's still tons of them (used) out there.
Example of 6s:
Ebay 6s (http://cgi.ebay.com/ANTIQUE-BRIGGS-STRATTON-GAS-ENGINE-PARTS-OR-RESTORE_W0QQitemZ370146475810QQcmdZViewItemQQptZBI _Farm_Supplies?hash=item370146475810&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C 240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50)
Example of 5s:
Ebay 5s (http://cgi.ebay.com/Antique-Briggs-Stratton-5S-engine-vintage-and-old_W0QQitemZ140296320833QQcmdZViewItemQQptZBI_Far m_Supplies?hash=item140296320833&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C 240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50)
6s tends to have more value because of it's 5/8" shaft.
The 5s has a 1/2" shaft and for this reason is not 'kartable' unless a 1/2" bore direct drive sprocket is used.
Nice thing about these engines is, if they through a rod, no damage will be done as block is cast iron.
Can't say that about their aluminum counterparts.

[jr dragster Tyler]

If the rod throws hard enough it will punch a hole even threw cast iron.

[Russ2251]

If the rod throws hard enough it will punch a hole even threw cast iron.

Not on these engines.
Never happened to me in at least 6 'attempts'.

[Kenny_McCormic]

If the rod throws hard enough it will punch a hole even threw cast iron.

They dont build stuff like they used too.

[jr dragster Tyler]

Hmm....I think I'd be able to get a nice hole in the block. Then again if they are so beefy the rod wont be breaking anyway.

[ZnsaneRyder]

In that case, it seems better just to get a cheap 5/8" $30 Max-Torque 11T clutch for it, and put it to use.

As far as power goes, is 25Mph a good speed to expect from it with the right gearing?

[BradenM]

Sounds reasonable but It will take you a while to get there.

[modelengineer]

My 3.5hp 2-stroke cast iron tec got my kart to 25, and it would go faster with a decent exhaust and if I modded the throttle so it opened all the way up.

I think a B&S 3hp will get you to 25, but it won't have very good acceleration.

[Russ2251]

Then again if they are so beefy the rod wont be breaking anyway.Rods in these engines are not 'beefy' and will break just as easily as any other stock rod. My point is, there is little (if any) collateral damage.
Sounds reasonable but It will take you a while to get there.Yes, about 5 seconds.

[ZnsaneRyder]

Thanks Russ. 5 seconds really isn't a very long while, especially if used on a bicycle trailer, I don't want to take off too fast. 10 seconds or so would even be fine to get up to speed.

[2or3wheels]

do you have a thread with you trailer set up? im very intrested in motorized biking. i have the bike im going to use as my test runner. havent decided to go frame mounted rack style mounted or what you have trailor mounted.

[ZnsaneRyder]

do you have a thread with you trailer set up? im very intrested in motorized biking. i have the bike im going to use as my test runner. havent decided to go frame mounted rack style mounted or what you have trailor mounted.

Sure

http://www.motoredbikes.com/showthread.php?t=12502

The first pics are simple, as it was new, then later on, I added ball bearings, more steel, and changed tires. I still have to upload more recent pics with it painted black with a new cargo rack on it now.

[jr dragster Tyler]

Holy cow how long is your thread on that site about the trailer?

[ZnsaneRyder]

Holy cow how long is your thread on that site about the trailer?

22 pages. :bannana:

It's just like a go-kart that attaches to the rear of the bicycle.

It hauls stuff too, BIG plus for a bike!

Now that's been done, I'd like to use my B&S engine to make a slower, simpler, and less expensive trailer.

I figure that if that engine can push a bicycle, then it also should be fine for the go-kart that the thread starter wants to build with this type engine.

[zakman]

is there anyway i could find a cheap engine to make a go kart with?

[Russ2251]

Define cheap. $100?
Spread the word among friends, co-workers, relatives that you're looking for gasoline powered equipment in any condition.
I posted signs around my work place and got so much stuff I had take down signs. Now my garage is filled with possibilities.
Some of it is junk...some of it can be utilized.
Tillers, weed whackers, cutoff saws, antique 2 cycle reel mowers, generators, pumps, ducted ventilation fans/blowers, snowthrowers, etc.
I'm still looking for running outboards and multi-cylinder RV generators.
Sometimes Ebay has some reasonable stuff.
How much power are you looking for?

[porsche930dude]

my 3hp briggs hauls my 150lb butt upto 40mph without too much trouble

[oscaryu1]

The metal fan cover on mine doesn't have the same shape as these engines, it's more square at the top near the cylinder and round at the bottom. It's probably a variation of the 6S.

1HP-1.6HP should be enough for slow speeds right? I was figuring, for Zakman's go-kart, or my bike trailer, that 3600RPM at 20 or 25mph should be a proper gearing. Any input on this?

It's not a variation. You have a Briggs 2HP then.

http://briggsandclones.110mb.com/briggs28.jpg

[zakman]

my engine is the exact same as the first pic that ZnaneRyder potsed...thanks

[zakman]

thanks for all your help guys, im a year older now, and know a lot more about it than last year, its a 60cc B&S, ive added a straight pipe and tuned the carb, ill put up pics and a video tomorrow

[zakman]

its a 1/4" shaft, and to add a clutch, i have machined a spacer to accommodate a 3/4" clutch bore

[solomon]

wow a 1/4"?! Wouldn't that thing snap with a clutch?

[zakman]

i doubt it, it use to run a home made table saw, or at least thats what it looked like

[solomon]

are you sure its not 1/2"?

[zakman]

come to think of it, yeah, it is, my bad

[solomon]

haha okay, i was getting a bit worried when you said 1/4" lol

[zakman]

what i plan to do with it is make a motorized bike, im using an old banana seat bike that ive chopped up