Briggs & Stratton 2 cycle

[Russ2251]

Almost ready. Just needs fuel tank. Hardest part was getting throttle linkage to operate cleanly.
Too bad it's not a live axle as I have 2 of these engines and would love to mount them both.
Eventually muffler will go and will switch to a short megaphone.

[crazycart]

Very nice setup,theres nothing like a 2 stroke,ive got a 2 stroke 340cc Kawasaki engine (around 35hp) in my golf cart and it really winds out.

[ironman]

Hey russ where do you get the rear sprocket that connects on the wheel and what size chain you using is that a 41 pitch.
Also do you have or can you take a picture of the wheel sprocket setup so i can see how it bolts together.
are your engine plates aluminum?

[jr dragster Tyler]

Is that a walbro carb?

[robin]

Very nice setup,theres nothing like a 2 stroke,ive got a 2 stroke 340cc Kawasaki engine (around 35hp) in my golf cart and it really winds out.


thats not alot for that cc aprila rs125s have 30bhp standard

my rx is puting out more than 16 and its 50cc bored out to an 80

[Russ2251]

Hey russ where do you get the rear sprocket that connects on the wheel and what size chain you using is that a 41 pitch.
Also do you have or can you take a picture of the wheel sprocket setup so i can see how it bolts together.
are your engine plates aluminum?

I bought kart as a kit from here:
http://www.tres-angle.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=GFOM&Product_Code=YK020WX
Tires, wheels and driven sprocket here:
YK044 http://www.tres-angle.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=GFOM&Product_Code=YK044
YK042 http://www.tres-angle.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=GFOM&Product_Code=YK042
Drive wheel and sprocket are purchased pre-assembled (72 tooth in my pic) and comes apart if you want to change sprocket. Brake drum was part of this assembly. I have switched between 72 tooth and 60 tooth. Chain is #35. I originally got the knobby tires but recently switched to slicks.
Engine mount is 6061 T6 aluminum throughout and bolted together.
Carburetor is an NOS Tillotson HL from around the late '60's and works best on all my 2 cycle engines which includes Clintons, Lawn-Boys, and Jacobsens.

[Russ2251]

thats not alot for that cc aprila rs125s have 30bhp standard
my rx is puting out more than 16 and its 50cc bored out to an 80

"The light that burns twice as bright burns half as long." Eldon Tyrell

[crazycart]

"The light that burns twice as bright burns half as long." Eldon Tyrell

So true.while that 125 may make 30 hp it still does not have the power that the 340 kawasaki twin does.

[jr dragster Tyler]

So are you going to run a diaphram fuel pump russ? I was thinking you where seeing that pulse line (vaccum line) on the intake manufold.

[Russ2251]

Pump is integral to carb. I normally tap into crankcase for vacuum pulse which requires tearing down engine. I don't want to take this one apart as it is brand new. When I rebuild any 2 cycle I automatically put taps in them. If I use a bowl carb (unlikely) I can just cap off taps.

[2or3wheels]

russ are you intrested in ant toro snow pup or very similar S-200 motor parts? PM me if u are.

[jr dragster Tyler]

Then russ whats the line of the intake for ? nos lol jk;) :D

[Russ2251]

The membrane of the Fuel Pump is activated by the vacuum pulses from the crankcase (or in this case intake manifold). The fuel is pumped and enters through the Fuel Inlet. Without this line carb would not operate. Doesn't matter where pulse comes from as long as it is not a constant vacuum.

[jr dragster Tyler]

ohhh i get it now it still requires a vacume its just the pump is built into the carb sorry im not good with these diaphram carbs but im good with flat slide bowled 33 mm and 42 mm mikunis and stuff

[russo2]

how does that work? the whole vacuum thing your talking bout,
i have ever seen something like it on a small engine

[jr dragster Tyler]

well in junior drag racing we use single cylinder engines. (still concidered a small engine) and we all use diaphram fuel pumps we draw the vacuum off the intake then from the hose off the intake it goes to a pump where there is two rubber plates about 2 and 1/2 inches big. And the fuel is between the two plates and there is a vacum behinde one of the plates pulling them appart then there is a spring to push the rubber plate back forward so the rubber plate goes back and forward so fast it pump's fuel out the outlet on the pump which leads to the carb. And the pump im talking about is external from the carb. And there is a few small engines out there that use the pump im talking about. If the gas tank is lower then the carb then it obviosly needs a pump of some kind. Sorry for taking over your thread Russ

[kibble]

I'm glad you described how those carbs work. I'm fairly a noob to some of this small engine stuff, in particular how the carbs work.

[Russ2251]

i have ever seen something like it on a small engine

Actually they are quite common: Weedeaters, chainsaws, hedge trimmers, large r/c aircraft, etc.
Most engines that use a diaphragm carb do not have exposed tubing for pulse that is needed to activate diaphragms, rather, it is 'built in'. There would be a small hole in carb base that lines up with hole in crankcase or intake manifold and therefore this pulse line would be not be visible.
Simply put...the diaphragm takes the place of the float that is found in a bowl type carburetor. Diaphragm is connected to a needle valve that is opened (allowing more fuel in) when a vacuum is applied.
Diaphragm carbs are less bulky and can run in any position but can be a real pain in the a$$ to troubleshoot. Without them I'd be dead in the water.

[kibble]

it is 'built in'. There would be a small hole in carb base that lines up with hole in crankcase or intake manifold and therefore this pulse line would be not be visible.

THAT'S what that little hole is for! I was wondering about that for a long time!

You, sir Russ, are offically awesome!!!

[Russ2251]

I love questions.

[Russ2251]

These are some of my diaphragm carbs that I have used/tested at one time or another with wide ranging results.
The 1st carb is from a Tecumseh Snow Pup and was (is?) used on some 4 cycle reel mowers. Very small venturi. Limited to small displacement engines.

2nd carb is a big-bore Walbro found on chainsaws with a 60 inch (5 foot, YIKES:eek: ) chain bar. I first used this on one of my Lawn-Boy conversions. Venturi is about double the size of original Lawn-Boy carb.

3rd one is a Tillotson and too similar to the Walbro to be believed.

4th is another Tillotson going back to late '60's and is kart specific. My best performer. This is a NOS (New Old Stock) carb.

5th is another Walbro and is used on Yamaha KT100 kart engines as well as powered paragliders. I've also seen these on twin engine ultralights. I tried this carb once but had a nasty mid range lean out. I will have to modify mid range jet.

[Russ2251]

Fuel tank, plumbing, and straight exhaust installed.
I ordered a VW exhaust tip which is really a small glasspack and was used on the air cooled Beetles, Karmen Ghias, and some early Porsches. This isn't a muffler but will tone down exhaust noise (somewhat) and is non restrictive as well as having a megaphone shape (original factory pipes were straight). Perfect for 2 cycles and precisely what I was looking for.
1st pic is for those of you who are not familiar with this pipe. Located just under bumper.
2nd pic is pipe as purchased.

[kibble]

Hey sir Russ, I have a question. I see that on your gas tank you have it supported with a bracket that is bolted down on the top of the tank. Did you drill the holes in the tank to attach it to the bracket? If so, what material did you use to seal it so it doesn't leak through the top? I was thinking of doing the same with the tank I will be using, as it doesn't have any other way to mount it.

[Russ2251]

Did you drill the holes in the tank to attach it to the bracket? If so, what material did you use to seal it so it doesn't leak through the top?No drilling. I ordered this tank assembly on-line, is brand new, and used it as it came out of the box.
If you want I can get you part #'s and web site(s). Tanks and brackets are available in different sizes.

[kibble]

sure, that would be good.

[ironman]

that tank set up does look good what did it run you

[Russ2251]

The following is pdf for Tecumseh HS50-67316K which is a snowblower engine. I own this engine so I knew what I was getting. This shows tank w/mounting screws and bracket that I used on my kart.
1 tank part #35584 (includes gas cap and 1 hose clamp) $14.73
2 screws part #650665
1 fuel tank bracket part #28371b
http://www.landscapepower.com/pdf/Tecumseh/HS50-67316K.pdf

A larger tank (roughly double) is on a generator that I also have but was too large for my use. This can be found in this pdf.
http://www.landscapepower.com/pdf/Tecumseh/H70-130202C.pdf

I bought parts here:
http://www.m-and-d.com/
This is where I buy most engine parts. Just enter part #'s into search window.

[Jblankster]

we better see some videos! if its fast enough, im jus going to use one of these!

[Russ2251]

we better see some videos!Hopefully soon. Winter weather is my nemesis. Not to mention $742 oil bill.

[Russ2251]

Added on glass pack megaphone exhaust and new Tecumseh air cleaner.
If this rain stops I will post video on YouTube of first test run.

[JerryAssburger]

LOOKS GREAT! Can you give a list of what was done to the motor... I'm meaning such things as carb, pipe, etc? Is that running a 5:1 ratio?....etc. Sorry, I'm nosey, and I can't wait to see how this one is going turn out.

[Russ2251]

we better see some videos! if its fast enough, im jus going to use one of these!
Well...I wanted to document initial startup of Briggs 2 cycle with new carb and guess what. Camera crapped out.
Turns out to be a factory defect and will have to ship it out for repair. Only used it twice in 3+ years. Once was for Youtube video which half the planet has seen by now.
Fortunately, I may have a backup camera, but now the forecast for tomorrow calls for rain.
When things get :censored: up they really get :censored: up!!!
Don't Touch That Dial!!!

[Jblankster]

hehe okay.

[ironman]

LOOKS GREAT! Can you give a list of what was done to the motor... I'm meaning such things as carb, pipe, etc? Is that running a 5:1 ratio?....etc. Sorry, I'm nosey, and I can't wait to see how this one is going turn out.
what would a 5:1 ratio be:arf: :mad2: :confused:

[oscaryu1]

what would a 5:1 ratio be:arf: :mad2: :confused:

The sprocket has 5x more teeth than the clutch has.

[Russ2251]

I'm running 4.2352941176470588235294117647059:1.

[Jblankster]

^exact enough?! lmao

so any video updates? test runs perhaps? how fast is it?

[Russ2251]

It is not mounted to kart at this time but I did test run it on a test stand. Sounds really good. Hopefully will have video soon.

[Russ2251]

Just in case someone tries to raid a Toro snowblower for engine, be aware that Snowpup is not Briggs powered. Would be Tecumseh. Only 1 ball bearing race on crankshaft and less hp.

[Russ2251]

Test ran for a few minutes. Don't want to :eek:upset the neighbors.
http://youtube.com/watch?v=t6UemFDyjkY

[jr dragster Tyler]

How come like all your lawn boy engines when you crank it over or turn it off you hear a rattle? is it just the flywheel or what?

[Russ2251]

How come like all your lawn boy engines when you crank it over or turn it off you hear a rattle? is it just the flywheel or what?
Sound you hear is typical for needle/ball bearing 2 cycles. Needle bearings are on wrist pin and crankshaft journal. Crankshaft is supported by ball bearing races on both sides. This arrangement can spin faster, handle heavier loads, is more efficient, lasts longer and can take a lot more abuse than plain bearing (bushing) engines.
Plain bearing 2 cycles are mechanically noiseless and give themselves away as being of cheaper manufacture.

[JerryAssburger]

...that's kind of good to hear, because when I did fire up my B/S 2 stroke, it sounded like that... I thought it was loose.

[kibble]

It looks like it blew in your face when you started it up! LOL:ack2:

[Russ2251]

It looks like it blew in your faceYeah, needed my daily dose of hydrocarbons:sifone::rolleyes3::ack2:
when I did fire up my B/S 2 stroke, it sounded like that... I thought it was loose.I was originally concerned about that too until I realized that all my Lawn-Boys do it. I figured-what were the odds of all 8 of them being bad even after rebuilding some of them.

[2or3wheels]

LOVE that 2 storke scream, and the exhaust smells :)

[Russ2251]

By the way...I have not given up on Lawn-Boy DuraForce. I just got sidetracked by Briggs engine. DuraForce powered kart should be a better performer as it is a reed inducted engine and has higher advertised HP.
It is ready to go and just needs to be mounted and adjusted.

[kibble]

One of these days... one of these days I'll get to that Lawn Boy...

[Russ2251]

"We are like butterflies who flutter for a day and think it is forever."
Carl Sagan 1934-1996

[kibble]

Awwww man, don't be getting all philosophical on me!

Hey, how about: "If it isn't scary, loosen up some bolts."?

[Russ2251]

Hey, look who's talkin' bout loose bolts:ack2:

Don't make me come over there!!!

[kibble]

Hey, look who's talkin' bout loose bolts:ack2:

LOL, that's exactly why I said it. :D I noticed that I'll probably need to use some thread lock on some of the drive stuff.

[Russ2251]

For anyone that may be interested:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=140237762077&ssPageName=STRK:MEBOFF:IT&ih=004

Be aware that this is 7 horsepower and not the 4 horsepower posted.
Brand new.
Does not include mount or tank.
I've seen this engine elsewhere for over $400. I paid $120 for each of the two I purchased.

[Russ2251]

Just purchased DuraForce mower flywheel (aluminum) from Ebay. This is interchangeable with current heavier flywheel (zinc?) that comes with Briggs engine. This change will lighten the load on engine making it quicker 'off the line'.
Unstable idle is expected but can be compensated for with a simple wave of my magic :devil2:screwdriver.

[kibble]

For anyone that may be interested:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=140237762077&ssPageName=STRK:MEBOFF:IT&ih=004

Be aware that this is 7 horsepower and not the 4 horsepower posted.
Brand new.
Does not include mount or tank.
I've seen this engine elsewhere for over $400. I paid $120 for each of the two I purchased.

Ooh... tempting!

[JerryAssburger]

Those and the 5hp Tecumseh motors that pop up. Sick, stupid fun!... and Brand New! Makes you want to get a live axle kart and run two of 'em to a pair of sprockets on the back! They're small and light enough...

[Russ2251]

Would be nice if there was a reversed flywheel and CDI available for this engine. Then live axle could be by-passed.

[sayre315]

is that a 4hp, 3600rpm?
if it is, what clutch did you get and where did you find it?

[sayre315]

is that a 4hp 3600 rpm?
if it is, what clutch did you use, how much was it and where did you find it?

[Russ2251]

is that a 4hp 3600 rpm?
if it is, what clutch did you use, how much was it and where did you find it?
Rated at 7 horsepower @ 4000 rpm (governed). I can only estimate my running rpm. Probably around 6000 or more.
I do not use governor.
Clutch is 17 tooth, 1 inch bore, #35 chain and is manufactured by Noram and cost me about $129.00. Got it here:http://www.heeters.com/kartclutches.shtml
Got both my engines off Ebay for $120.00 each. See post #53 this thread.