Look`s great!!! 2 trick`s that make i nice difference are..1 a 3hp flywheel with a slight advance (offset keyway) you use a plate to drop down the magneto..and a little deck porting..remove the eyebrows off the deck between the valves and the piston and machine down that part of the deck bellow piston hight...major increase in flow...i run that setup with a tilston carb. and 18% nitro on my mini bike...hard to beat...you will be amazed on how much faster the engine rev`s with the smaller lighter flywheel...keep the video`s coming
Thanks for all of the info! i did a bit of eyebrow trimming on this engine, the first time I have done that. Sometimes we use the model 10 (4 horse) head, as it increases compression, but I hear they don't flow as well at really high revs. We are having some carb issues with the 5 horse Tecumseh carb.
Thanks, my son made the intake manifold and air cleaner adapter. i built the engine. It worked out pretty well powering an off road go kart, though we had to machine a crank to take a roller bearing, as the normal bushing couldn't take the load, and seized onto the crank.
Yes, we weren't expecting it to be so close, I guess the 22-1/2 degree intake needed to be a few more degrees. so far the 5 horse tecumseh carb. is causing a bit of grief, as it won't idle down to as slow of a speed as we would like. It may be the Crane 91019 cam needs a faster idle speed than we can use.
No real reason to, because even in stock form the tank mounted carb is mounted right next to the muffler and without the benefit of an exhaust pipe extension. Briggs & Stratton knew these engines in and out and if the proximity of the carb to the hot muffler were a serious issue it would have been addressed. Both types of mufflers, the Briggs 294599 or the Briggs 494585 muffler (hamburger shape), they are still in close proximity to each other. There's no real concern about the carb sucking in exhaust gases because the force of the exhaust pushes gases well away from the engine. All in all, mitigating engine heat is really not an issue if this engine is mounted on a moving vehicle.
Porting the intake and exhaust ports is not often recommended as they are already too big to begin with, especially the exhaust. The casting imperfections in the intake port actually help in atomizing the fuel + air mixture as is the "corkscrew" that Briggs sometimes added to the Pulsa-Jet carburetors. Some of the tried and true power mods just do not translate well from flat head to OHV engines; the engines are just too different.
Interesting, I always clean up the ports with a Dremel, removing the casting "fins". Though I have to admit, I have never done dyno tests to check the results.
Get a aluminum flywheel on it (most people stick a 3hp flywheel on 5hp engines) to take the edge off the inertia. Never want to run an iron flywheel with a upgraded cam. That valve float in the beginning was premature from the sound of it.
Those large cone filters are nice and all, but they need the foam pre-filter installed and maybe the mesh "sock" because alone they are very porous and do not block dust and other fine particulates from entering the engine. They are almost worthless, really.
Good to know, as my son is building up a somewhat serious Briggs Raptor to use on a mini bike, so it will be subjected to lots of dust! Man the parts are expensive though, the billet flywheel, cylinder head and con rod, as well as a higher lift cam and custom stainless exhaust.
When you get some spare time you should check out Jonathan W, he's primarily a tow truck driver but he does some pretty interesting things with small engines.
Howdy, I used a 6" (or so) long 3/4" npt black (not galvanized) pipe nipple, and welded it to the Briggs muffler that has a 3/4" thread on it. If it vibrates too much, we make a brace from 1" wide by 1/8" thick flat bar steel, and drill a hole in it 11/32" dia. to fit the head bolt size. Then bend it so the it will fit under the head of one of the nearest head bolts, then angle downwards at a shallow angle the the exhaust pipe. We attach it to the pipe with a screw type hose clamp, let mw know if you need a vid showing what I am trying to describe.
Yes, the racing con rod will fit a 5 horse model 130--- Briggs lawnmower engine, as my son put on in and used it. there are some vids here showing it, I think they are called racing lawnmower or something. The cam and rod woke the motor up for sure, but only for racing, as it would rev too fast for cutting grass (you would be dangerously over-revving the blade. Those racing con rods are like Hens teeth to find these days though!
Thanks for the reply. The engine and project I'm working on is actually a 6.5 hp Briggs vertical shaft from a pressure washer now mounted on an outboard motor lower unit. I don't think many people modify the vertical shaft engines unless they are the higher hp models found in riding mowers turn racing mowers.
@@kevinjohnson9372 You're correct. The original power head had a higher rpm range. I ended up going to a higher pitch prop instead of modifying the motor. The motor works but you aren't going to set any speed records lol.
Good to know, as long as you check each one for any small cracks first. Back when I was making my sleeve valve 3 horse Briggs, I asked Briggs if I was safe to run the engine at 6500rpm, and they said that was getting close to their burst redline for a stock flywheel.
+ChargerMiles007,if you wanted to go the route of turbo i reccomend the ecotrons small engine turbo its best suited for 150-600cc engines so it'll really shine with the 5horse. its about 400$ for the turbo,oil cooler,oil pump,and some flanges and gaskets.
maybe someday i'll send you the turbo and possibly the EFI kit to go along with it. i love your video's and would be really interested to see something like that. maybe we could get a partnership of a sort going. :)
I don't think we went with a 4 horse head on this one, but I am not 100% sure. I have a limited supply of those heads, so I try not to give too many away :)
We CNC machined this intake, still have the program, but not sure what it would cost to run another one. the main cost is the aluminum chunk, but we may be making another one.
Well, it might be possible to cast it! Admittedly, that introduces other problems. but it's a possibility if you can find somebody that does hobby casting.
I need an intake and carb like this! I'm building a 3 hp briggs snow thrower. I don't like the in tank carb that is on it. Any help would be greatly appreciated!
We are still having idling problems with the engine, got it to rev and hold 5700 rpm, but idling much below 2200 seems to be a problem. Our briggs Raptor carb. might be the solution yet. I was trying to avoid that, as they are not a very cheap item, plus I have a box full of Tejunkseh carbs! :)
In my case with POSgen, it's that it couldn't govern itself properly (rev and die, rev and die, rev and die....) and worked better on half-choke, so I gave up with that heap and got a proper Honda EX650 generator, got a load of videos of both on my SanitaireC12 channel... :) Could get a proper MZ175 carb for it though, it's just that I can't be bothered!!! :P
hey you know those honda gx160 clones, i get anything that looks close to a gx160 including legit ones and all the parts fit, chinese parts on a honda and a genuine honda cylinder head and carburetor on something else and the parts fit perfectly, if it works hey im happy, briggs and stratton lawnmower carb on a 2 stroke pocket bike engine and stuff like that doesnt bother me
Yeah, my reason for my buying my POSgen project was because the engine looked like a GX160 engine clone, sadly, it wasn't and took me a while to find out what it was (the already mentioned Yamaha MZ175), I now have it working nicely with a Honda GCV160 carb, to the point where I even had it running on Paraffin (kerosene) just for the hell of it... :D I like small engines, they provide so much entertainment... :D
i love junkyard small engines, rebuilding a trashed honda gx160 to me is like rebuilding a chevy big block for a car guy, the gx160 is in my opinion the very best small engine design to ever have existed, even the clones are so reliable and abuse hardened compared to even an old briggs, even the honda clones have an iron sleeve and ball bearing supported crank the famous briggs 5 horse from the 70s had an aluminum bore and journal bearing crank and its not like they were short lived, i expect a properly taken care of chinese honda clone to last for atleast 10 years all day every day with a hard life, lots of work, those overhead cam hondas i dont know about tho, has a timing BELT not a chain, as far as i know that breaks and your piston smacks the open valve through the top of the engine and you throw it away, it also has a plastic cam, like what the new throw away ohv briggs lawnmower engines have, cheeper to make? oh yea, last longer? i doubt it, i only trust one engine any more and its the ohv honda design, i also love 2 strokes, i got a honda cr80 whole motor from a guy who cracked the right crank case half and i have to high temp jb weld it, the tig welder guy says its right dickered but i thing i can still make it run long enough to make a bicycle go 70 miles an hour, got the radiator and hoses, expansion chamber, muffler, and everything besides the ignition capacitor and the carburetor and those arnt a problem to find and make work
Ok, perhaps I miss-spoke. I meant that the engine does not have removable bearings or bearing inserts to support the crankshaft (like in a car engine). It is possible to put a bronze bushing into the crankcase cover to improve its life over the stock aluminum cast "bushing" that is an integral part of the cover.
@@ChargerMiles007 no worries was just being a smart-ass 🤣 its a curse sometimes. Great video been watching some since finding your channel so far ur doing great man keep it coming
Look`s great!!! 2 trick`s that make i nice difference are..1 a 3hp flywheel with a slight advance (offset keyway) you use a plate to drop down the magneto..and a little deck porting..remove the eyebrows off the deck between the valves and the piston and machine down that part of the deck bellow piston hight...major increase in flow...i run that setup with a tilston carb. and 18% nitro on my mini bike...hard to beat...you will be amazed on how much faster the engine rev`s with the smaller lighter flywheel...keep the video`s coming
Thanks for all of the info! i did a bit of eyebrow trimming on this engine, the first time I have done that. Sometimes we use the model 10 (4 horse) head, as it increases compression, but I hear they don't flow as well at really high revs. We are having some carb issues with the 5 horse Tecumseh carb.
Use a 3.5 flywheel better
You can run the stock 5 HP flywheel if you're using the engine in Raptor form (racing engine) and make very nice power.
You should make a piston out of gallium and see how that runs! That would be awesome.
it would melt in like 2 secs
You do a good job man that engine looks slick
Thanks, my son made the intake manifold and air cleaner adapter. i built the engine. It worked out pretty well powering an off road go kart, though we had to machine a crank to take a roller bearing, as the normal bushing couldn't take the load, and seized onto the crank.
convert a smog pump to be a supercharger for it yeahhh!!!
My son has the same idea!
Nice engine build. Batman will be excited to get his gocart going with that one!
Thanks, yes it is kind of unique, we just have to iron out the carb. gremlins!
ChargerMiles007 Tecumse carbs do more rpms. spell check hates Tecumse. Good Batman engine.
I'd probably angle that muffler away from the air filter to reduce the heat and exhaust intake back into the engine. Looks great though.
Yes, we weren't expecting it to be so close, I guess the 22-1/2 degree intake needed to be a few more degrees. so far the 5 horse tecumseh carb. is causing a bit of grief, as it won't idle down to as slow of a speed as we would like. It may be the Crane 91019 cam needs a faster idle speed than we can use.
No real reason to, because even in stock form the tank mounted carb is mounted right next to the muffler and without the benefit of an exhaust pipe extension. Briggs & Stratton knew these engines in and out and if the proximity of the carb to the hot muffler were a serious issue it would have been addressed. Both types of mufflers, the Briggs 294599 or the Briggs 494585 muffler (hamburger shape), they are still in close proximity to each other. There's no real concern about the carb sucking in exhaust gases because the force of the exhaust pushes gases well away from the engine. All in all, mitigating engine heat is really not an issue if this engine is mounted on a moving vehicle.
Porting the intake and exhaust ports is not often recommended as they are already too big to begin with, especially the exhaust. The casting imperfections in the intake port actually help in atomizing the fuel + air mixture as is the "corkscrew" that Briggs sometimes added to the Pulsa-Jet carburetors. Some of the tried and true power mods just do not translate well from flat head to OHV engines; the engines are just too different.
Interesting, I always clean up the ports with a Dremel, removing the casting "fins". Though I have to admit, I have never done dyno tests to check the results.
How about a baked clay piston?
very nice job.
Looks good :)
Thanks.
Get a aluminum flywheel on it (most people stick a 3hp flywheel on 5hp engines) to take the edge off the inertia. Never want to run an iron flywheel with a upgraded cam. That valve float in the beginning was premature from the sound of it.
3.5 flywheel is the one to use I have a built raptor runs on methonal m1
Those large cone filters are nice and all, but they need the foam pre-filter installed and maybe the mesh "sock" because alone they are very porous and do not block dust and other fine particulates from entering the engine. They are almost worthless, really.
Good to know, as my son is building up a somewhat serious Briggs Raptor to use on a mini bike, so it will be subjected to lots of dust! Man the parts are expensive though, the billet flywheel, cylinder head and con rod, as well as a higher lift cam and custom stainless exhaust.
you got any intake your look grate
Slick! Hope you can get it dialed in!
Thanks, we are hoping we can also.
Yup!
Please,I need to know where you purchased the intake manifold? Thanks.
My machinist son NC programmed and machined it.
Needs a small turbo or smog pump supercharger!
When you get some spare time you should check out Jonathan W, he's primarily a tow truck driver but he does some pretty interesting things with small engines.
Thanks for the advice, i will check into it.
I have the same exact motor I'm building a mini chopper how exactly did you do your exhaust right now I have no exhaust at all and need to make a pipe
Howdy, I used a 6" (or so) long 3/4" npt black (not galvanized) pipe nipple, and welded it to the Briggs muffler that has a 3/4" thread on it. If it vibrates too much, we make a brace from 1" wide by 1/8" thick flat bar steel, and drill a hole in it 11/32" dia. to fit the head bolt size. Then bend it so the it will fit under the head of one of the nearest head bolts, then angle downwards at a shallow angle the the exhaust pipe. We attach it to the pipe with a screw type hose clamp, let mw know if you need a vid showing what I am trying to describe.
Do you know if your performance connecting rod and cam would work on a Briggs flathead vertical shaft engine as well?
Yes, the racing con rod will fit a 5 horse model 130--- Briggs lawnmower engine, as my son put on in and used it. there are some vids here showing it, I think they are called racing lawnmower or something. The cam and rod woke the motor up for sure, but only for racing, as it would rev too fast for cutting grass (you would be dangerously over-revving the blade. Those racing con rods are like Hens teeth to find these days though!
Thanks for the reply. The engine and project I'm working on is actually a 6.5 hp Briggs vertical shaft from a pressure washer now mounted on an outboard motor lower unit. I don't think many people modify the vertical shaft engines unless they are the higher hp models found in riding mowers turn racing mowers.
@@edwardh1003 what can you do about the gearing the out bord probably turned near about 7000 rpm if the briggs guys 4200 its gonna be slow 🐌
@@kevinjohnson9372 You're correct. The original power head had a higher rpm range. I ended up going to a higher pitch prop instead of modifying the motor. The motor works but you aren't going to set any speed records lol.
I've had luck on 3hp and 5hp briggs running cast aluminum flywheels off vertical shaft mowers.....cheaper than billet ones for sure!
Good to know, as long as you check each one for any small cracks first. Back when I was making my sleeve valve 3 horse Briggs, I asked Briggs if I was safe to run the engine at 6500rpm, and they said that was getting close to their burst redline for a stock flywheel.
@@ChargerMiles007 interesting! Was that for the cast steel one?
do a dry ice piston
did you do an oak or pine piston lol
I have done an oak piston crown, as well as Ipe, plywood, red cedar and juniper. Ironwood to follow.
did you make the in take
My son made the intake, I got a bit better run using it on the 4 Valve Briggs Cammer engine.
Can you put a turbo on a briggs
+ChargerMiles007,if you wanted to go the route of turbo i reccomend the ecotrons small engine turbo its best suited for 150-600cc engines so it'll really shine with the 5horse. its about 400$ for the turbo,oil cooler,oil pump,and some flanges and gaskets.
Sounds good, but too rich for my blood! I did try to Turbo Compound a Briggs on vids a few years back, but that was an unsucessful experiment!
maybe someday i'll send you the turbo and possibly the EFI kit to go along with it. i love your video's and would be really interested to see something like that. maybe we could get a partnership of a sort going. :)
What's up with that big spike sticking out on that rod cap?
That is the oil slinger.
It's pretty unusual then. I've only ever seen the nylon plastic type with 2 paddles. Interesting.
For engines with an air vane governor the oil slinger is a piece of sheet steel which mounts to the rod end.
douro20 Gotcha. Thanks man.
Yes, it is the oil dipper.
4hp head?
I don't think we went with a 4 horse head on this one, but I am not 100% sure. I have a limited supply of those heads, so I try not to give too many away :)
doesnt seem like the briggs minds if its drinking through a tecumseh carb
True, we are still having some tuning issues.
This is sick , you sound canadian?
Yes, I am Canadian :)
Lol i made a very similar intake and used the same carb!!!!
Did you have any luck with it? We ended up putting on a Raptor carb, then it worked well.
I would love get a intake manifold to use a Tecumseh CARB'
We CNC machined this intake, still have the program, but not sure what it would cost to run another one. the main cost is the aluminum chunk, but we may be making another one.
Well, it might be possible to cast it! Admittedly, that introduces other problems. but it's a possibility if you can find somebody that does hobby casting.
I need an intake and carb like this! I'm building a 3 hp briggs snow thrower. I don't like the in tank carb that is on it. Any help would be greatly appreciated!
try putting nitrous oxide into a brigs engine
No what the hell
A tecumstain carb on a Briggs? Can't be any worse than a Honda GCV135 carb on a chinese-clone of a Yamaha MZ175 engine, like my POSgen generator... :P
We are still having idling problems with the engine, got it to rev and hold 5700 rpm, but idling much below 2200 seems to be a problem. Our briggs Raptor carb. might be the solution yet. I was trying to avoid that, as they are not a very cheap item, plus I have a box full of Tejunkseh carbs! :)
In my case with POSgen, it's that it couldn't govern itself properly (rev and die, rev and die, rev and die....) and worked better on half-choke, so I gave up with that heap and got a proper Honda EX650 generator, got a load of videos of both on my SanitaireC12 channel... :)
Could get a proper MZ175 carb for it though, it's just that I can't be bothered!!! :P
hey you know those honda gx160 clones, i get anything that looks close to a gx160 including legit ones and all the parts fit, chinese parts on a honda and a genuine honda cylinder head and carburetor on something else and the parts fit perfectly, if it works hey im happy, briggs and stratton lawnmower carb on a 2 stroke pocket bike engine and stuff like that doesnt bother me
Yeah, my reason for my buying my POSgen project was because the engine looked like a GX160 engine clone, sadly, it wasn't and took me a while to find out what it was (the already mentioned Yamaha MZ175), I now have it working nicely with a Honda GCV160 carb, to the point where I even had it running on Paraffin (kerosene) just for the hell of it... :D
I like small engines, they provide so much entertainment... :D
i love junkyard small engines, rebuilding a trashed honda gx160 to me is like rebuilding a chevy big block for a car guy, the gx160 is in my opinion the very best small engine design to ever have existed, even the clones are so reliable and abuse hardened compared to even an old briggs, even the honda clones have an iron sleeve and ball bearing supported crank the famous briggs 5 horse from the 70s had an aluminum bore and journal bearing crank and its not like they were short lived, i expect a properly taken care of chinese honda clone to last for atleast 10 years all day every day with a hard life, lots of work, those overhead cam hondas i dont know about tho, has a timing BELT not a chain, as far as i know that breaks and your piston smacks the open valve through the top of the engine and you throw it away, it also has a plastic cam, like what the new throw away ohv briggs lawnmower engines have, cheeper to make? oh yea, last longer? i doubt it, i only trust one engine any more and its the ohv honda design, i also love 2 strokes, i got a honda cr80 whole motor from a guy who cracked the right crank case half and i have to high temp jb weld it, the tig welder guy says its right dickered but i thing i can still make it run long enough to make a bicycle go 70 miles an hour, got the radiator and hoses, expansion chamber, muffler, and everything besides the ignition capacitor and the carburetor and those arnt a problem to find and make work
@2:14 ✋ ✋ ✋ Wait.....Hold up....a crankshaft has bushings 🤣🤣🤣🤣
Ok, perhaps I miss-spoke. I meant that the engine does not have removable bearings or bearing inserts to support the crankshaft (like in a car engine). It is possible to put a bronze bushing into the crankcase cover to improve its life over the stock aluminum cast "bushing" that is an integral part of the cover.
@@ChargerMiles007 no worries was just being a smart-ass 🤣 its a curse sometimes. Great video been watching some since finding your channel so far ur doing great man keep it coming
you any relation to clint eastwood....
Go ahead Briggs, Make my day!!! :)
What makes you ask?
When you speak it reminds me of him! -)