Briggs and Stratton model:80302-4015-01 Carb Help

Enzo

Enzo

New Member
#1
#1
Hi this is my first post to the forum as I just recently acquired my first mini bike project. :biggrin: I was able to obtain an original Ruttman Spyder with all the original parts for $75 on craigslist. This bike came with a Briggs and Stratton 3hp model 80302-4015-01. Heres the link to the parts manual http://bsintek.basco.com/BriggsDocumentDisplay/Z6nlyJVJ1DajI.pdf
Everything looks pretty good internally and externally as I have already dismantled and cleaned out the sludge in the engine. The one downfall is that the carburetor is missing several pieces like the air filter assembly. Also the carburetor is directly attached to the gas tank(The inside of the tank is rusted up, any ideas on getting rid of that?) The carburetor is not rusted up internally but I am concerned about the availability of the parts seeing as this motor is 40yrs+. So instead of fumbling with this old carb if I cannot get parts is there a possibility of putting on a more modern carburetor? Here are some pictures:
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Thanks for any help. This is a great website and will continue to visit.:thumbsup:
 
The_Ruppster_86

The_Ruppster_86

New Member
#3
#3
Welcome to the forum Enzo. If I were you I would try the "Metal BB" method to clean the tank. Just fill the tank with 1/4 clean gas and metal BBs, tape off or plug the top holes of tank, shake vigourously from different angles, drain and repeat several times with clean gas. I have gotten very good results in the past using this method.

What you have there is Briggs & Stratton Pulsa-Jet Carb. Extremely commonly found carb. Generally parts that need to be replaced on them are the diaphragm (check side cover w/ 4 screws), needle and seat, the tank to carb body gasket, and carb to block gasket. It will be of your interest to thoroughly clean every hole, tunnel, fuel pipe, and screen with carb cleaner. You should be able to get most of these parts at your local lawnmower shop. If not, someone should have them for sale on ebay.

Not to yank your chain, but I don't think your engine is 40+ years old. There should also be a code on your front shroud. The code is usually 8 digits long. The first two digits will tell you the exact year.
 
Enzo

Enzo

New Member
#5
#5
Wow thanks for the quick replies everyone.
The BB method sounds pretty good Rupster thanks.Also if I have to buy a brand new carb does it have to be an original Pulsa Jet specifically for my model or could it be from a newer engine? I will bring over the carb to my local small motor shop and see if I cant get me some parts :laugh:
thanks guys
 
oldfatguy

oldfatguy

Active Member
#6
#6
they used that same carb for over twenty years so the parts are very easy to get. All it needs is a good cleaning and like someone else advised replace the diaphragm and gaskets. Also make sure that the pick up tube screens are not clogged. It is a very simple carb to work on and should run fine once it's cleaned up.
 
F

funky ole

Member
#9
#9
that pulsa jet you have is not original to that engine,at least i don't think so.
what you have is the newest pulsa jet carb.maybe 20 years old,but the newest made.
first there was the pull choke,then the flip choke,then the emissions carb that you have.
tough to clean out thoroughly i might add.
thats also the old blower housing on a new block.
 
The Restore Kid

The Restore Kid

New Member
#11
#11
All of the parts on the engine are orignial to the engine..

The engine is not original to the bike..

The 01 in your code number makes it a 2001 motor.. If thats the case the fuel flow probably can not be adjusted and the carburetor is junk by design.. :hammer:

I can't tell for sure from the pic, if you have an adjustable or fixed jet.. but 2001 is pretty new, and like maybe 1995 or 1996 is really about the final years for the adjustable jets..

Then, your gas tank, if it is rusted, you are going to want to clean and ispect the bowl inside the tank VERY WELL before trying to run it.. The rusty tanks, quite often have a RUSTED OUT fuel bowl, and it will not hold fuel, and the engine can't run.. :glare:

So thats a common problem to look for in them whilst it's apart..

Already mentioned was the diaphragm thing..

You can actually fold the flappers over on a bad diaphragm and make it (work) temporarily until you can get a new one.. It doesn't always work, but usually if it's not crumbling apart, if folded and creased the right direction, usually a bad diaphragm will work long enough to experiment with other stuff.. And that is all free to do...

I would start by taking the tank off from the carburetor. You don't even need to take the carb off the motor to do that.. And it will allow you to clean the tank real well, all of your pickups and passage ways on the carb,

Then you can bolt it all back together and see what you have to start with...

If it's junk, you might be better off just buying all of the old parts that will make your engine (look original) to the bike... If you do that you'll need a starter sprag, because your motor has a different recoil system in the shroud...

I have a gas tank and carb like you have that is about to get junked that might work and I'm sure the tank isn't real bad...Antique carbs I am not sure about.. I know I have one, but think it's pretty rusty too...

I know I have the older model blower housings and a starter sprag, and even a cylinder head if ya decided to go that far... The new engines and old engines look quite alot different, and even the block itself has quite a few tell tale signs of not being original, but at a distance the old carb and blower housing would make quite a difference..

I'm thinking it may just be easiest to find the 1970's parts that you know work, and bolt those on it..
 
Enzo

Enzo

New Member
#12
#12
ok thats sounds about right as I took the shroud to a shop for a second look as the model numbers are rusting off. I believe you about the non adjustable/ new carb. Since it is a pulsa jet do you think I could swap the new carb with an older one? I have a bunch of early slide choke pulsa jets, could I just swap one of those in? Thank you for all of your input.
 
Mini Motors

Mini Motors

Member
#13
#13
As long as that's what you have. Pulsa Jets and Vacu Jets look similar. Pulsa's have the diaphragm pump on the exhaust side of the carb, and fit the tanks differently. So if by chance you have Vacu's, make sure you have the right tanks. Otherwise, you should have no problems swapping them.
 
The Restore Kid

The Restore Kid

New Member
#15
#15
Yes they will all JUST ABOUT bolt on the same.. The newer carbs have a larger bolt pattern on the intake port.. So you'd have to drill and tap a second hole in the engine block for the older carb (if need be) but most all the newer engines that use the newer bolt pattern, are typically drilled for both types of carb..
 
O

oldbugger

New Member
#17
#17
Enzo said:
Wow thanks for the quick replies everyone.
The BB method sounds pretty good Rupster thanks.Also if I have to buy a brand new carb does it have to be an original Pulsa Jet specifically for my model or could it be from a newer engine? I will bring over the carb to my local small motor shop and see if I cant get me some parts :laugh:
thanks guys
Click to expand...
Muriatic acid is cheap and in Home Depot for about $10-15 for 2 gallon box, in the garden section. If you don't see it ask, as it has to be separated from other products that react violently with it. READ what NOT to use it with as it does react very violently with some other chemicals. Brush it on then wash thoroughly to clean it off. Do not leave it on too long as it is corrosive. Wear protective gloves made for chemical protection, NOT plastic or dishwashing gloves. Works great for corrosion cleaning on alum alloy, not sure about rust on metal though. Nasty stuff but it does the job.
 
O

oldbugger

New Member
#18
#18
Maybe you can help me a little. If your engine has a 2 5/16 inch X 3/4 inch PTO can you give me your complete engine number (all 3 sets of digits)
I have possibly the same engine but the PTO on mine is only 1 5/16 inch long and that is too short for me to mount a outboard clutch assy. I figure with the engine number for a similar engine with the longer crank I can order a longer crank for my engine.
Thanks
J
 
Enzo

Enzo

New Member
#19
#19
Ok thanks for the info on the rust OldBugger. that muriatic acid seems like some nasty stuff. The number is 80302-4015-01. if those are not the numbers you need I will send you the user manual as my shroud is rusted up on the numbers. My crankshaft is definitely the 2 5/16". I can also send you the parts catalog for that motor. Send me a message and give me your email and ill send it.

Also I tried my Old pulsa jet carb on my 3 hp today (12/18/11) and she fired right up on the second pull! I put alot of time and work into it. I replaced the head gasket, the piston, the rings, the carb, honed the cylinder and degreased and cleaned everything. Very satisfied and the motor runs like a dream.
 
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