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Old 07-06-2019, 05:41 PM
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Default New Briggs 3.5 HP flathead!!!

Behold my latest Craigslist acquisition!
It's a 1976 Briggs 9 Ci flathead. I'm 90% sure it's 3.5 HP, but someone please confirm.
It has good compression, and strong spark(it shocked me while I was checking spark! ), so it's essentially just carb problems, but I'm not sure if it'll run, as I haven't even put gas in it yet.
Also definitely need to check the oil.
Biggest problem is that the recoil start's got a lazy/worn out spring, so that certainly needs lube, or maybe even a rebuild.
I got it for $30 off Craigslist, this is the "8 HP flathead" I've talked about a bit, the seller was mixed up and didn't know how to read the codes, so he thought it was an 8 HP just 'cause it came off a tiller, but NEWS FLASH! There are lots of sub-3.5 HP tillers out there.
When I saw the size I was like "Okaaay, I don't think that's a 319, I'd better check the numbers."
It's got a 5/8" crankshaft, and the engine spins over REALLY easy compared to my 132432 5 HP flathead with the high compression cylinder head!
Partially since it's got a more normal flathead compression, partially since it's just smaller.
This engine will eventually go on the Radio Rod.
For a while I was chuckling at the thought of a 319 on that itty-bitty wagon, but I'm kinda glad it's a 147cc, since it'll fit better on the Radio Rod.

EDIT- It's NOT a 9 Ci 3.5 HP, it's an 8 Ci 3 HP.
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20190706_171955.jpg   20190706_172011.jpg  

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Old 07-06-2019, 06:13 PM
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How are you going to mount it on the wagon? Looks fun, but those current wheels scare me lol
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Old 07-06-2019, 06:17 PM
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3.5hp briggs sound cool and are really fun! Lucky you also i would lift your wagon and use an old kart frame to build it
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Old 07-06-2019, 07:04 PM
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Quote:
Originally Posted by 950speed View Post
How are you going to mount it on the wagon? Looks fun, but those current wheels scare me lol
I'm gonna redo the rear end. And certainly replace the rear wheels, maybe the fronts as well.
It's only 3.5 HP so I'm not too worried about it being too much power.

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3.5hp briggs sound cool and are really fun! Lucky you also i would lift your wagon and use an old kart frame to build it
I'm gonna lift the rear end when I do it to give it the classic hot rod stance.
It's currently got a square tubing frame, and I'm just gonna modify it to fit an engine.
I am lucky.
I still have yet to hear it run, with muffler or header.
This'll be good!
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Old 07-06-2019, 07:37 PM
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Awesome!

I know I’m getting a bit ahead of you but what kind of tires are you going for?
Fat and thin? Tallll or short?
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Old 07-06-2019, 08:04 PM
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Yeah, 90000 series are 3.5HP engines. 3HP are 80000 series but I believe they're dimensionally similar and use the same blower housing, for one.
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Old 07-07-2019, 07:42 AM
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Awesome!

I know Iím getting a bit ahead of you but what kind of tires are you going for?
Fat and thin? Tallll or short?
I really don't know at this point, but probably tall and skinny to permit drifting, but also as a measure to keep it from flipping when I inevitably do try to drift. I'm thinking slicks or maybe ribbed, but probably slicks.
I might pursue this project slowly alongside the One Tire Fryer, but my #1 goal right now is to wrap up the OTF in time for the end of the Build Off.
Then I can go nuts with this thing.
I'm gonna have to do something to the steering, because the way it's set up, it will get in the way of the engine.
I'll probably make a almost totally new system.
Step #1: Get the engine running!


---------- Post added at 08:42 AM ---------- Previous post was at 08:15 AM ----------

I'm trying to figure out what kind of carb I have on here by deciphering the codes.
The Model code(the important one) is 92902.
The way my Numerical Designation Guide reads(official B&S), is that it's a 9 Ci engine, basic design series 2, and vertical crankshaft with a Pulsa Jet carb.
That can't be right, so what is it?
If I'm reading the entire code correctly, it's got a non flange mount plain bearing/DU block, with the obvious rewind starter.
PLEASE HELP!
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Old 07-07-2019, 08:43 AM
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Probably had a cover swap ya never know but awesome find they are wonderful engines
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Old 07-07-2019, 08:56 AM
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Yeah probably, the block is white and the cover's maroon.
I thought that the vertical flatheads had a different style blower housing, but IDK. I'm gonna check the cylinder head to find out the displacement. It'd better say 9 on it!
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Old 07-07-2019, 09:01 AM
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Your lucky i cant find any briggs around here only ticrapsehs and they never run
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Old 07-07-2019, 09:08 AM
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Just checked the cylinder head, and it says:
08
DAAAAAAHHHHHHHAAAAAARRRGGGHH!
The HP rating for this thing keeps going down for me! At first I expected it to be 8 HP, but the seller was mixed up! Now I find out the blower housing is not original!!

So it's a 3 HP, and it'll be much harder to track down parts than I expected, since I don't know the original codes.
I don't even know what year it was built!

As for knowing what kind of crankshaft bearings it has, or what kind of carb, I'm just gonna have to tear it apart to find out.

CAN YA TELL I'M A LITTLE CRANKY!?!?!?
It'll get mods, otherwise it's gonna be waaay slow.
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Old 07-07-2019, 10:17 AM
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He's a little cranky
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Old 07-07-2019, 10:25 AM
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Crankymcspunkmaster.
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Old 07-07-2019, 12:49 PM
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I'm just gonna roll with it and try to get it running.
First thing will be to check the oil, then clean the gas tank a bit maybe, lube up the recoil start(or rebuild if neccessary), and basically just try and get it to fire before I tear it all apart.
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Old 07-07-2019, 02:45 PM
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I must admit I like your new name. I'm gonna modify it to CrankyMcSpunkster so it rolls off the tongue better. Credit to Budget of course.

So your assumed horsepower rating went down a half, big deal.

The assumption was that it was the correct blower housing (but from another identical engine) but I see now the angle for the starter handle is 'clocked' funny. Most horizontal shaft engines have the handle clocked at about 9 o'clock for easy starting, yours is half past 11 or 12 o'clock.

You have a Franken-Briggs. Be proud!

What it should look like:

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Old 07-07-2019, 04:16 PM
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CrankyMcSpunkster.
I like it.
Yeah I noted the odd starter orientation.
This thing will eventually get built, probably to all heck. I'm thinking Mikuni, full port, polish, and shaved eyebrows, slightly thinner head gasket, header, billet rod(if I can get one, anyone know where?), maybe even some oversize valves, and all sorts of fun stuff like that.
It's gonna need those mods if I want it to be fast.
I don't care too much about this one, since it's only 3 HP, so it's an excellent learning platform to learn how to do all these mods.
Today I'm gonna go knock off a bunch of that gunk. and check the spark plug and oil.
Does anyone have a good way to clean the gas tank? Or should I just spray some carb cleaner in there, leave the cap off, and let it evaporate?
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Old 07-07-2019, 05:03 PM
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Default Disgusting!!!

There's what I knocked off the engine block. !!!
And a pic into the NAAAASTY gas tank!!!!
Looks nice and rust free, but someone left gas in there waaaay too long.
I don't even want to start it until I've cleaned out the tank at least.
I still need to check the spark plug and oil, but at least I have a better idea of the state of this engine.
Not great.
Can anyone tell just from the exterior what kinda of carb I have?
Also I found out that is has the screw in muffler.
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Old 07-07-2019, 06:29 PM
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Yeah, they're all dirty at least the ones I find for cheap, but cleaning is part of the fun.

Plenty of ideas on cleaning the tank--soak in white vinegar, use that rust remover stuff (Evapo-Rust), utilize one of the many gas tank restoring kits (POR-15, etc), also "mechanical removal" as in fill it full of screws and nuts and shake it to death.

....and stay away from ethanol.

Your carb is the exalted, sometimes lambasted, Pulsa-Jet with adjustable jet (and push-pull choke).

EDIT: and you have the "air vane" governor which has a paddle that reacts according to the the amount of blower air flowing against it.
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Old 07-07-2019, 06:34 PM
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I think this thing has a pneumatic governor, because in the second picture, you can see that it lacks the normal governor arm.
Does that mean it's pneumatic?
Also I noticed that this particular engine only has only oil fill cap.
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Old 07-07-2019, 06:47 PM
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Quote:
Originally Posted by JTSpeedDemon View Post
I think this thing has a pneumatic governor, because in the second picture, you can see that it lacks the normal governor arm.
Does that mean it's pneumatic?
Also I noticed that this particular engine only has only oil fill cap.
Yeah, sure, pneumatic (in a broad sense); "Of or relating to air or other gases."

Hopefully the one oil filler is accessible in your intended orientation, but yeah only one is not unusual.
Plus your gas tank is ultra small, like half a pint or something, lol.
I've seen those before in photos. Wonder what the intended usage was? Something for short duration use.

I'd take it all the way down (apart) just for giggles. De-carbon the cyl head, check cyl wall for scoring and other abuse/neglect, do a valve job. The last flathead I serviced had mud in the crankcase (sludge) so the connecting rod journal was scored badly from oil starvation.



Or not. You're gonna need a new gasket set if you disassemble it.
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