Junkyard Built Briggs Engine Problems! Vintage Mini Bike Build
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- čas přidán 13. 01. 2019
- We restored a vintage mini bike last month, and we installed our home-built Briggs and Stratton 5 horsepower flathead engine on the mini bike. A cam, bigger carburetor, racing head, stiffer valve springs, a 3 horsepower flywheel and more were used to build the engine from all used parts, and now that the vintage bike is finished, we're having mystery engine problems.
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And the Hip bone is connected to the Thigh bone . When I was young a 5 hp was the boss we had a big dirt field behind our school it had humps,bumps and a couple small jumps and when it rained that was a whole different experience just Fun Fun FUN !!! Try riding like that on school property now days their were six of us full time riders we cut lawns ,washed and waxed cars ,pulled weeds collect bottles and anything job we could to buy gas and parts ,I remember having to buy a few cables , no helmets or safety gear just sun glasses and a backwards ball cap those were the days .
Tank Soldier Awesome!! I’m jealous!
Bad Rad ,it was a blast ,wish l could do it all over again .
@@tanksoldier9770 We do the same thing around our farm
Joel Boley Hey there I see your Massey Harris sign I have an MH 22 great tractor right now it's not running it sat to long and it won't turnover and needs new tires ,and I have an old MH swather with wood spokes on the 10 ft header with drapers and lots of belts that was my first swather and l sold my pto MH bailer a while back it made nice 85 lbs bails ,I went to NH bailers 2 and 3 wire bailers 100lbs on the 2 wire and up to140 lbs on 4 th crop alfalfa with the 3 wire also I have a NH 2 twine and a JD 2 wire bailer , nothing beats a farm and ranch life !! Thanks TANK
@@tanksoldier9770 Massey Harris made good machinery back in the day.... We have a MH 444, three MH 30's two of which run and one that the engine is stuck, two MH 44's, and a MH 44 special. Good ol rake and baler tractors..... We do mostly hay and cattle farming. Wouldn't trade farm life!!!!
Fuel delivery.
Bowl is emptying faster than it fills up.
That's my guess.
i agree 100%
Needs a fuel pump to fix that
I'd have to agree. The thing is suckin the bowl dry over and over again. They should put the old flywheel back on too. Seems like the heavier flywheel is being accelerated with enough force to sheer the keys constantly.
@@anythingthatmoves9609 Could also drill the bowl filler inlet out just slightly. I have done it with some success on chinese scoots.
@@izzyplusplusplus1004 where exactly do you drill? The outside of the carb where the gas enters, or the inside seat? Just curious haven't thought about trying it.
Ike is so chill. I'd like to hang out with him. Would be good for my anxiety to be around someone so relaxed.
Ya
Ike is like that neighborhood dad that was so cool he made the other dad's look lame
I've worked professionally in my own small engine repair business for over 35 years and i can say without a doubt that the flywheel must be installed with an impact with the special tool or tighten it much more with the hammer than what I've witnessed you do. Also the starter clutch has been a problem on briggs engines. the trick is to polish the part of the crankshaft that inserts into the clutch, put a drop of oil on the fabric wick in the bottom of the hole on the clutch and clean the channels for the ball bearing in the housing. They can stick in the "sling out position". Also there is no rev limiter. The jetting may be too rich..........that's what it sounded like to me or possibly valve float.
Love old flatheads ;) Your problem with the flywheel is easy. The key wont hold the flywheel, its just for easy timing. The crank is tapered and the wheel is fasten on the taper. The taper can have bad fit to the flywheel and then you need to take some valve grinding paste and grind the flywheel to the crank. You will see at the surface when you have grind enough. :)
The best thing with mondays and wednesdays is carsandcameras! :)
( Peter Hellberg
Peter Hellberg) is correct, you have lost the taper fit with the flywheel. It will never stay tight. Seen it plenty.
Correct Peter, this is what they need to do.
I have a b&s I believe a 1966 power craft 2HP that this gave me nice pointers Thank you 🙏🏼 please film more #Briggs&Statton videos!!!!!
i think the coolest thing about CZcams is that i have been able to watch you guys go from being one of the few vids on about minibikes and modding them to being a growing industry. And to see it be able to support your hobby, and friends you have made.. truly inspiring. From a guy you never met, on the other side of the U.S., keep up the good work.
The starter clutch/ratchet is a serviceable part. Use a bladed screwdriver and pop the black rubberized cap off, there will be 6 steel ball bearings inside put those aside and lift the ratchet out. use a piece of wire and push the felt dust cap out of the ratchet and clean the inside with degreaser and emery paper if needed and put the dust cap back in. give everything a good clean with degreaser and reassemble the clutch taking care to be clean. Before mounting it back on the crank use a piece of fine emery paper to clean up the crankshaft. It is debated in the industry whether you grease or leave the clutch dry, I personally run them dry as brand new OEM parts come dry.
I away put grease on mine.
Grease of any kind impairs it from working properly. Mabe a light oil.
If the ratchet assembly is dragging you may have a bur on the crankshaft end. Try polishing the shaft stem. Or if you hit it with a hammer it's mushrooomed....
I put a tiny little bit of oil on the shaft itself. Nothing in the ratcheting mechanism for reasons stated.
the concept inside the clutch is to let the balls move freely and the centrifugal force in running engine keep this balls away from the ratchets , putting oil will reduce this movement and with sum dirt that will be a good way to loose the clutch and the pully and in sum case the crankshaft.
John and ike, that starter clutch has to be super tight! You have to hold the flywheel with a strap or a bar on the find, then tighten the clutch ad tight as you can get it. As I have a small engine shop, I have the flywheel holder and wrench for the clutch, and a cup wrench I can use a impact to tighten the clutch. That cast iron flywheel has a lot of mass that the clutch had to retain. Also be sure to have the steel cup washer on there also.
Yup and the washer has to be the right way. I wouldnt use an impact itll snap the crank but the surfaces also have to be smooth and clean no burs or grease! Lap it with compound if you have to antiseize works in a pinch. Iv ran them without keys no problem its really just there to position it.
The following video features activities performed in controlled environments by knowledgeable persons. DO NOT attempt to duplicate, re-create, or perform the same or similar activities at home, as personal injury or property damage may result. CARS AND CAMERAS, the persons shown in this video and ANY CONTRIBUTOR, ARE NOT LIABLE FOR ANY such injury or damage. ALL CARSANDCAMERAS CONTENT IS FOR ENTERTAINMENT PURPOSES ONLY.
Thank you for all of your hard work. Great content, consistent upload schedule, plentiful information, and 2 awesome dudes. You guys rock.
I hope y'all dnt ever run out of stuff to do cuz y'all make my Mondays so much better n I wanna say thank you iv learned so much from you guys and have had a lot of my own fun because of you thank u again
If you're shearing keys left and right, that means the flywheel's and crank's tapers are not mating and locking together properly. You need to get some valve lapping compound and lap the 2 together. The key doesnt do anything to hold the flywheel in place, it is ONLY for alignment for timing. You need good mating tapers. And, get yourselves a piston stop that screws into the spark plug hole so you can torque that nut properly.
brandon2076 yep key just sets the timing. Tapers hold it all together from spinning
Finally someone who knows what theyre talking about.
@@jeep2003 it's a common misconception in the world of small motors! Lol
This video was awesome to watch! It just goes to show how easy C&C can overcome so many obstacles. I like learning from you guys! It might have taken all day but you guys have a sweet running mini bike now!
You guys are making me want to get another old Briggs and Stratton Mini bike. I had a bunch of old go carts from the 70s and sold them but Im going to find one of these and buy it.
That back fire at 12:28 was unreal
Your guys persistence always amazes me!. Great episode
dissasemble the carbeurator and stick it in a untrasonic cleaner... it works wonders dude
Desaint Mustie1 Would be proud of you
Desaint How much does it cost.
300zxdriver, about nothing! ultrasonic cleaners can sometimes be found at a thrift store, or you can make one pretty easy with a very high RPM little DC motor and small weight (basic vibrator), firmly attached to the bottom of a metal coffee can a little offset from center.
cleaning solution? for metal parts use kerosene and squeeze/mix half tube of cheap ultrabright toothpaste into it. give it rubber legs, or a handle to hang from a stand on a light spring (better). throw stuff in and let it run overnight. they're really THAT simple a device to make and use.
"ultrasonic" just means the vibration is faster than 20khz, but it doesn't have to be, a 25-30,000 RPM motor can do the job too.
@@300zxdriver harbor freight sells them for about $80
The great words of Ike "Something happened, Something happened" lol keep up the great work guys
670 v-twin + rat rod wagon = BIG Fun. Nuff said.
Love the race guys! As for cutting out at the top end, fuel delivery for sure! (25+ yr mechanic) You can try - shortening the fuel line, raising the float level, or down sizing the main jet. One or a combination of those should solve your issue. Good luck, keep the videos coming!!
I love the vintage mini bike pls more vids on the mini bike
Sounds very much like valve float...if you buy aftermarket heavier springs specifically designed for the Briggs it should stop that. I think the predator springs were either too short or not strong enough to get those valves closed in time for the next compression stroke at those high rpms your lookin for. Also, with higher rpms comes the danger of your flywheel shattering. That’s what the light valve springs are for is to keep the rpms low enough to keep the flywheel from breaking and possibly hurting you. A billet aluminum flywheel can handle those high rpms and is also lighter just like the 3 hp flywheel y’all had. I don’t think it’s carburetor or fuel but I could be wrong. GREAT STUFF!
love your videos and channel soo much, thank you guys for the awesomeness and blessful channel/videos, you guys are special to me and I'm thankful for you, God bless :), everyone have a good and blessed day!
I hope you guys stay after it because I really enjoy your projects.
Very cool guys, can’t wait for the next one
More old vintage Briggs mini bikes..!
I've had that happen a few times cause of starter issues and you are totally correct doesn't damage anything but the key itself
U should do a goped build. They are sweet and more practical for teens with a tight budget.
Hey check out our channel, we have a build video and riding of my goped sport that I built and we'd appreciate the support!
Who cares about practical? They're boring af... I don't think the channel is based on, "getting to the campus library in a pinch, and on a budget"...
I love watching your videos guys the engines and toys caught my attention but your friendship mixed in with all made me stay you guys are awesome
Stater Clutch locked up .Polish crank where the spin mechanism resides ..If you tighten the Starter clutch a little tighter the key won;t be an issue .It is not compressing the compression washer tighten enough .Use a crescent wrench on the square shaft and tighten it as tight as you can and don;t beat on the Starter clutch . I was a small engine mechanic for 38 years and was diagnosed as a mechanical genius although I think they need a new test LOL
merci les gars pour les vidéos like yours style les bro from TAHITI french polynésia
I had a MB in the '70s we used a 5HP BS from off of a old Tiller. Rebuilt the engine and oversized the bore. IT was pretty fast. the brake was a paddle that pushed on the rear tire.
That thing dose grate burnouts!!
kool scooters, burn outs and a close race. Good stuff, keep it up.
You guys are mini bike/go-kart geniuses
Sometimes I feel like I’m there with you guys.
Great videographer
Hey guys, just passing on a tip from an old timer I got back in the 90's. If you keep shearing the flywheel key on a Briggs flatty, it's just from a sloppy fit. Put some valve grinding compound on the crank before sliding the flywheel on. It will take up the slop and you should be good to go. BTW, put some light oil in those starter clutches to keep them going. Also, the cutting out is probably fuel delivery.
Yeah, don't most of them have a pin hole in the top so you can put a few drops of oil in there when doing maintenance? Been quite a few years since I tore into a mower engine.
@@olds97lss yep. I remember trying a ton of different oils in mine and having some fantastic failures. I don't remember what worked best, I think it was marvel but it's been a long time.
Awesome video again!
Really nice bike! I love the blue!
Dudes also sand the flywheel magnets for cleaner spark..look into light weight racing flywheels for quicker revving but less torque..starters munching themselves? Pry the cap off the starter where the bearings are or use the starter lube hole at the starter end of the crankshaft. Also more spring preload on pull start spring even 1 or 2 turns helps recoil alot!
Lap the flywheel onto the crank shaft with valve grinding compound and clean it well, you may not have any more issues with the flywheel coming loose.
Man I love youguys and your channel never give up on a Briggs they were first really like the paint scheme on the mini bike and engine it's fast and it's a vintage show bike 👍
You guys never give up. Never quit. If you don't know you figure it out. Not many of us left. It's all computer now. Keep on keepin on.
You guys need to do something bigger then all these small engine carts and bikes. May I suggest you get an old dirt bike 250cc, 2 or four stroke, don’t matter up to you, get a good chassis and go from there with shocks. Pump it out, I think I would be interesting and I think you guys might too.
I suspected that there would be issues with the after-market parts, Briggs & Stratton engineers did a lot of work to tweak parts to make them durable and reliable. I love you Isaac, you know Briggs engines very well, I'm going to get your channel too, bud!
Make sure you guys check gear ratios on both bikes. Also try to get tires size the same making them equal as possible.
Great video as always.
Really like the look of the blue mini bike.
Has that old school look.
You can take the starter apart there are a few bearings inside. A lot of times they get gummed up and don't release. There's a hole and you can put a few drops of transmission fluid. There's a felt pad inside.
I restored my "CAT" minibike for my sons in the 90's. I bought a new Honda 5Hp OHV and a Comet "Torqaverter, new tires, had the seat recovered all the chrome polished, other worn parts replaced, repainted and new decals.
Looked brand new, ran 10 times better than ever- it had take-off and top end.
My ex got it, it from the boys and sold it. eos
beotch
I had a mini bike same as the blue one same blue almost and it was fast lol. My uncle found it in the trash and gave it to me . Wow what memories
Use valve grinding compound to lap the flywheel to the crankshaft. Use an offset key and raise the timing.Make sure you have a stock size jet in it for gasoline.
Sweet Video!!
U guys are the best at this stuff
Looking forward to the race
Good work!
As we say down here in Texas.... " If it wasn't for bad luck... you wouldn't have any luck"! Great Vid Guys Keep me entertained I am Love'n it Rusty
Another great video. Keep up the good work!
One thing that really helps when a key keeps shearing is to hone the flywheel on the shaft with valve lapping grit because the cone holds it not the key. It can help and only takes a few minutes.
I love when there is a notification of this guys :D
Nice mini bikes. I'd like to see you make a little dirt bike track and race around it, put some numbers on the bikes.
I love the briggs stuff
keep it coming guys
Nice job 👍
I love old school briggs , keep up the old style briggs .
one fix that we used was a larger fuel line, adapted to fit the carb. We also used a brake hone to hone out the air horn on the carb. Make sure that you do not have any pin hole leaks on the intake gasket, gasket sealer usually fixes that.
Time to get the proper socket for the starter clutch. The clutch needs to be even tighter than "super dooper tight"
Also lap the flywheel to the crank stub with valve lapping compound. It will increase the contact area and decrease the chance of it slipping prematurely
Put a tiny little bit of oil on the shaft where it contacts the clutch bearings before you put the clutch back on. Problems will go away with it spitting out the rop.
Hi from Wales,due to your influence, I have finally got a mower to mess with, 14 hp briggs Vee twin, got all the mowing tack off, and just about to switch pulleys about.....Although I am wondering if an "offroad" style might be more fun than a top speed mower (more fields to drive on around here) Might be a good build for you guys, a crawler mower......
I recently gotten 2 8hp 305cc flathead briggs and stratton engines and put on my coleman mini bike and actually going to build a performance 305cc with the other one
Bring back the turbo drift trike please do a revival on it please it was such a great build
Those Briggs engines are awesome. Tough little motors. The flatheads were the best, but those units are getting pretty old now and thing break on them. Luckily parts are dirt cheap and they made millions of them.
hey guys love the channel and have been subscribed for years. wouldnt change a thing guys except maybe equalize the volume please
Sweet vid
Great video can't wait til the next one
Great content, cool cars
Valve grinding compound on the crankshaft will hold the flywheel in place.
Steel key and more fuel .. She seems to be starving out at speed .. JUST MY TAKE !! .. ENJOYED .. Thanks guys
You do have the coolest driveway and yard/race course.
Hi, I see you change the value springs on the briggs, if you have good valve seats i took a long valve stem from a truck tube cut it off as long as you can knock the center of a spark plug out JB weld the valve stem into the plug. Put the plug in the head close both valves shoot air to the head it will hold enough pressure on the valves to remove the valve keepers release the air lift valve remove the springs. Works great if you don't want to pull the head.
Fun video!
Do a horizontal shaft Briggs opposed twin build!! Finicky engines but you guys would make an awesome series of videos with it I would love to see that!
Flathead or side valve motors tend to go flat on top especially with valve springs that are too light for use in a fountain pen. They reach max rpm and fall off the face of the earth. Flywheel woodruffs are there for the purpose of positioning the flywheel during reassembly so proper ignition timing can be achieved. Not there to hold it in position in any way during actual running. If I were being lazy I’d first try lapping the two tapers with valve compound.
My friend got me a tshirt for Christmas from you guys. Also it sounds like my atv was the bowl couldn't fill quick enough
such a cool video! clean fun
Love mini bikes..
See what happens when Murphy comes to visit. A sacrifice to the small engine gods is in order.
flattening a head low budget way : get the bathroom mirror and some 600 grit waterproof sandpaper
put water on mirror flatten the sandpaper over the water so it sticks to the mirror put more water on the sanding paper lay the head on the sandpaper and start making figure 8 motions with light pressure , keep checking the shine on the mating surface if its fully filled in youre there , good way to raise the compression too after grinding a little of the mating surface using course sandpaper
about the surging of the engine : could it be a floating or slightly stuck valve (then again it would pop and sputter if it was )
probably ignition , get some electronic ignition thing running of a battery to test that
You guys always make great videos.
sounds like 1 of two things from my experience. 1: It could possibly be the needle seating, if the needle is off you'll get to much or to little air at high RPM's causing a bog condition, or 2: I would like to say it's a seal problem on the intake but it'd be revving erratic from start to finish. I would check the bearing on your crankshaft... At high RPM's it's probably vibrating the flywheel to a shimmy and getting a little air in, which would totally disrupt pressures on the crank case. Just a thought, I can't wait to find out what it is! Watch it be a needle setting.
I got a minbike for xmas when i was 6. Wish in still had it. It was 1975 when i was 6. But i still road the 100cc dirtbike i had to run and jump on to ride. Cuz i was too short
im surprised you guys don't have a spark plug cleaner. I have one that I got from an old motorcycle shop that was going out of business and they had an extra. I love it for junk projects so I don't have to waste needless cash buying new plugs for everything. ive reused plugs multiple times by just having a spare set that I cleaned and I swap plugs and clean the ones I just removed and put them back in after checking the gaps. I always clean and regap my plugs. I only ever buy new plugs when 1 goes bad.
Dude you gotta RESPECT the Briggs buddy.. LOL 🤘
y'all some smart guys
Me, I would have taken the Bearing Recoil Starter apart...
Let me say, it's INTERESTING!
If the bowl is emptying faster than it's filling then hook up a lawn mower fuel pump. Most of them run of of a crankcase breather, so it should hook right up.I've tried the trick with a 3hp and it worked great.
Ah, the old squash the air filter to make it clear the frame trick. I had to do the same on my motorized bicycle.
for the cord coming out, squirt some oil in the little hole on the end of the starter, when its installed on the crank shaft. whats happening is the starter is sticking to the crankshaft and not freewheeling. no limiter it's probably the carb
maybe add a pulse pump in line with the fuel line or bigger vent to the tank? i think rbg had a similar problem with one of the karts they built and ended up having to use a dirt bike vent with an extended tube and breather on the fuel tank, still, sweet build, cant wait to see how well that little blue minibike runs with the problems all sorted out
You need to lap the flywheel to the crank. Use valve grinding compound, keep at it until the flywheel and crank look like they mate perfectly. Then the flywheel will stay put and you won't sheer keys anymore. Also get that stater tighter than what you showed in the video. I think it sounds like it is either running out of gas in the float bowl (check float level) or the main jet is to small. It doesn't sound like valve float... Also check the gas tank vent.
Briggs and stratton for life
I've been working on this stuff professionally for 36 years so I know a thing or two about these engines. You did not tightened the starter clutch well enough......this I observed before the engine was started. Secondly, it is a very common problem for the smooth part of the crankshaft to seize on the smooth bearing surface of the clutch. Sand the crankshaft smooth and make sure the felt plug has a drop of oil on it. The felt plug is inserted at the bottom the the long hole in the starter clutch. It's purposed is to lube and cushion the gap between the end of the crankshaft and the welch plug looking cap on the starter clutch. It did not seize and unscrew itself. There is a high pitched squeal when the crank and clutch seize. This partial seizure pushes the rope out. Left unattended it can even melt the spool for the rope if it is plastic. Hope this helps. Great work otherwise! PS. there is a special tool to remove the starter clutch so you can zip it of and on with a half inch impact.
You guys are awesome.