Briggs & Stratton Flathead Model 28 Race motor teardown

Last video was tearing into the model 44 v-twin motor, this time its the little 12hp flattys turn. This motor has been raced for many seasons with an ARC billet flywheel, high torque starter, ARC 6280 billet connecting rod, Brass counter weights, precision cams 246 grind, AVS piston and dual valve springs. Its not been a bad little motor but after a mishap that lead to it being run out of oil its time for some attention!
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[@gabrieletassoni1011]

Parts's link?

[@johnkoury1116]

Thanks for the good ideas.

[@BillyRillkratz]

By the way, very good video. I like your comments a lot.

[@nkaratzas]

Great Video Guys! I am racing the SP/sportsman class as well! hoping you guys can make it up to Prove It Mower Racing's opening weekend the 27th and 28th!

[@TheJanticJournal]

+Mud Machine I won't be nearly ready by then, I'm trying to be ready by a national USLMRA race at the end of July. But once my stuff is good to go I'm hoping I'll be able to come up there to Prove It Racing!

[@hillbillypeakgarage6797]

Where did you buy the flywheel and the cam and the rod?

[@AJ-tz6qu]

I see you have the shaft with the nut so you can remove the eccentrics. I'm looking for the spec's for a model 28 crank that uses a bolt of what the measurements are where the counterweight sits on the crank. Can't seem to find the accept or reject specs for that part of the shaft. Thanks

[@BuildProne]

where did you get the brass counterweights?

[@hillbillypeakgarage6797]

How do u rest the value lash?

[@sabbath7081]

Do they make the brass counterweights for the model 25, 11 horsepower or only for the 12, model 28, I realize the number 25 and 28 is cubic inches, I'm just talking for a regular engine not performance I just want to get rid of the synchro balance rattle on my lawnmower.

[@user-qx8dw1gq2b]

Do you know where you got the parts for that motor

[@vfr01]

Hey im trying to get this exact mower and motor build but i might go bigger with a Kohler command 14hp do you know any motor builder's

[@matthewbreeden7748]

I have a 14 horse ohv motor without the oil filter where do I get performance parts

[@dylanphillips9745]

Hey so I'm new to racing and I have a 13 hp i/c it runs good but I have no governor on it and I'm afraid of blowing it up. So if you count post links for the flywheel and if the rod will work in mine that aswell thanks

[@waylongreenhaw4806]

I've ben wanting to build a 12hp briggs but I can't find any parts for it

[@lrst_196racing5]

from where can i get this racing camshaft ?

[@codyedgington6852]

Imma hotrodder myself but gotta rebuild my grandpa's model 28. Question. Where can I find the cam and performance parts? And how much can you shave these heads before you throw the word "safe" out the window

[@theegwana2103]

Dam I wish I seen you video earlier I just ground the crank and lightened the piston and added counter weights to original weights :/ lol those brass slip ons are a lot more safer with revs by the looks

[@eclipsegst9419]

Im working on rebuilding one of these. Intake valve seat is a probelem. Someone reseated it and then whacked around it with a sharp punch to keep it in it looks like. Either way its not seating. Is getting an oversized seat possible/feasable? Or should i just grab a different block?

[@TheJanticJournal]

If you don't have much else invested in the block I would just look for another one build.

[@eclipsegst9419]

TheJanticJournal it was free. My dad gave up on it and replaced it. I got the seat properly seated but the intake valve doesnt close on time for the compression stroke. There is no reason the timing should be off as they never opened it to my knowledge. Just need a pulley puller to check. If its not the timing i think ill just find a bare block in good shape. Or i do have access to a Kawi fc420v, which runs but there are no hop up parts. I found a place that will grind a cam, but arc has no interest in a one off flywheel. I may see if it has a similar snout to any briggs or honda. Im not afraid to fab some stuff up. Experimenting is fun.

[@jack2swaggy231]

can i get links to all the parts

[@yellowhelmetracing4576]

Where did you get the needle bearing for the timing gear? I wanna get one to keep my engine running as long as possible!

[@TheJanticJournal]

I think I got it from McMaster Carr

[@yellowhelmetracing4576]

@@TheJanticJournal Thanks for the reply! I didn't think I'd get one on this older vid!

[@NinjaNeglector]

Teach me senpai! Lol dude I would love to work with you on these engines! Too fukn cool man too cool

[@devin4035]

Do you run with or without the governor?

[@TheJanticJournal]

Governor is removed with the old old hole for the shaft tapped and plugged. You have to keep in the oil slinger that runs off of the cam though.

[@michaelmcclain9702]

What site you order the flywheel off of, i cant find 1 for my 12.5 hp briggs

[@TheJanticJournal]

I think I got it off of E.C. Carburetors, it's been a while but I think ARC used to sell them directly too.

[@benkalinowski5834]

Hi Cool build Got a question I'm building a 14.5 hp model 28 ohv Can I use the model 28 12.5 hp flathead arc dog bone and the arc rod in my engine Ty

[@TheJanticJournal]

Unfortunately no don't know the answer off the top of my head. ARC should be able to help you out easily.

[@benkalinowski5834]

@@TheJanticJournal I emailed them a long time ago and they won't email me back No joke

[@tannermake2453]

Where does one find the copper head gaskets for these? I can’t find any.

[@TheJanticJournal]

Check out Copper Gaskets Unlimited, they might have them for the flat heads

[@gonewronggarage4565]

Where did you get your cam?

[@TheJanticJournal]

E.C. Carburetors

[@terrymiller7138]

Where do you get the performance parts for the 12.5?

[@jack2swaggy231]

thats what im wondering too he said arc rod and flywheel so im guessing go powersport's

[@gonewronggarage4565]

Where do you get the brass counter weights?

[@TheJanticJournal]

I dont exactly remember but I would check e.c. carburetors first

[@gonewronggarage4565]

@@TheJanticJournal yep they had them lol thanks!

[@alignwelding6160]

How can we get ahold of you for any questions ???

[@TheJanticJournal]

On here is fine or a dm on instagram works too

[@flamespearmusic9358]

Is it possible to run these without any counterweights or will they grenade their selves?

[@TheJanticJournal]

+Mountain Mania I think what people will do instead of brass counterweights is they run a billet "dogbone" and run the stock weights. I don't know how it would act with no weights at all.

[@flamespearmusic9358]

TheJanticJournal ok thanks.

[@Small_engine_garage]

i ran mine without the weights because the aluminium "dog bone" snapped and the motor grenade so i wouldn't recomend using it without them

[@Green007ism]

Hi, I just got an 11hp model no 254422 and I've been told it'll explode it I take the govnor out and keep it stock. Can I do the same mods as this engine has and if so has anyone got a link to where I can get parts?

[@TheJanticJournal]

E.C. Carburetors should be able to take care of you

[@AEON.]

What's it cost to send them engines off to get them worked on - bored and all that? for the twin and single

[@TheJanticJournal]

+Nicholas Brown The singles we're around $600 for sleeving, boring, clearencing the bottom of the bore for the rod, clearencing for the bigger cams, cleaning the block and the valves. The twin isn't done yet but that's just a straight .020 bore so hopefully it's not too bad

[@AEON.]

TheJanticJournal that's not too bad actually. Thanks for the reply man!

[@pigradar8481]

I have a 900 series intek and I want to put it on something, I had it on a gokart but I had to sell the gokart and now I have it on a old tiller and I want to put it on something else but I don't have any knowledge about fabricating stuff but I want to learn, and I want to put it on anything really but I have a super super tight budget do you know anything easy and cheap I could do?

[@TheJanticJournal]

+PigRadar Hmm, that's got me thinking. You want it to be something you can ride or just anything to tinker around with?

[@pigradar8481]

I kinda want it to be something to ride, I have a old full metal lawn mower that I have been thinking about slamming it and making it look awesome and put a tow hitch on it for small trailers but I have no clue where to get started on anything like that. But with my motor I have on my tiller, I kinda want to put it on a mini bike or something, maybe a old dirtbike frame but I don't know anything about gear boxes or anything so really, I am just looking to learn anything that is cheap.

[@TheJanticJournal]

+PigRadar minibikes and go karts are by far the easiest and cheapest to get going. Just keep in mind something like a dirt bike would probably require a lot of customization to make a Briggs work on it.

[@pigradar8481]

oh yeah? Well, for a mini bike, can you find frames for under $100 online or how would that work? I might be able to get my old go-kart back but I am going to have to pay more than I sold it for, but it was a crazy machine, offroading like a 4wheeler, plowing threw everything and jumping over bumps, only thing about it is I need to extend it and move the steering wheel to the center, I do have a small welder that I got for under 100 bucks from a pawn shop, I wonder if It could work.

[@Bleachanna]

where did you buy the upgraded parts for this engine?

[@TheJanticJournal]

+Zachary all the performance parts came from E.C. Distributing

[@Bleachanna]

TheJanticJournal do you remember which ones you purchased for it? Or a guide that would help me know which parts fit it?

[@stefberkenbos814]

What did you do with the valvecover

[@DANIEL-gg1ir]

needmore videos

[@TheJanticJournal]

+oIN YOUR FACEo0 You're absolutely right! We've been slacking really bad but I've got a little project to show and should be in a video coming out soon.

[@chuckhuff7123]

It's definitely 10 now😢

[@parkerdragracing9475]

I wish he would've showed us the lobes on the cam

[@TheJanticJournal]

+Parker Drag racing Unfortunately it's off at the motor shop with the block or I'd take some pics for you and put them on the Facebook page. Are you curious about seeing something in particular?

[@nicholashamaway2954]

V

[@BillyRillkratz]

Jesus, do oil change more often, black like a mamba. Do you have pressurized lube?

[@TheJanticJournal]

+Wurst Express That was new oil haha. I think I hurt the motor when I accidentally ran it out of oil. These flat heads are not pressurized oil but the v-twins I have are.

[@ryanjohnson191]

the salt is off the roads......break out the G body

[@scotttalken8431]

I be 1st

[@scotttalken8431]

Almost