KartFab ok, in that case.if I am always gonna be over 5500rpm due to always going fast. Would I be better off just doing intake, exhaust and torque converter?
You want the bigger mini bike to win? Take off Torque converter replace with a racing clutch with 15T and a 50T rear sprocket about a 3 to 1 gear ratio and the mini bike with wheelie bar will be seeing dust!
I enjoyed the "Run what you brung" race, but I'm not too sure it was even. You weigh more and had larger tires. I bet if you had the Briggs on a similar bike, with similar riders, that old flathead would have kicked azz!
Is the torque a verter better than a performance centrifugal for racing? I know you can change out springs and weights on the centrifugal to change the stall speed. Just curious.
I expected kart-it to win because his is more lightweight and has the wheelie bar, but he couldn't get it off the line without either breaking traction or not keeping it in a straight line. But even though you have more weight, your rear tires are larger and probably grip better, and more weight can sometimes help with off the line acceleration.
Kartfab, did your header on the mini baja come with the threaded end for 1" RLV muffler, Or is it an adapter? Really like the idea of a threaded muffler instead of the clamp on type. Would like to find an weld on adapter for the GPS header and not spend 50 bucks on the clamp on one. Thanks, fun video, glad kart it didn't bite it.
Change the drive ratio..... put a 12 tooth on the TC of the Roper. Kart It need some bar ends for behind the seat? I make them out of aluminum....... Have you seen the set I made for my Roper? Pretty sure I posted pics before my attendance slumped off......
except mine is a 5 hp flathead. as a rule of thumb, you take the intake valve diameter, take off about 2 mm, and that is the size venturi you want to put on a carb. I just took the displacement of the engine, and used a honda knockoff carb of similiar displacement engine. my 213cc briggs flathead engine took the honda gx200 carb. So a 3 hp has smaller displacement, so you may have to look at a small dirt bike carb like a mikuni or walboro (spelling im not sure of)
do you think it would be possible to build a go kart with 2wd out of a garden tractor frame with $75? is it possible to also put some kind of like flat bed or a box on the back so I can use it on my family's ranch? also, I'd like it to be under 50cc so that it is street legal. if this is somehow possible, let me know. (also I'm 12, so I'm not a very good fabricator, but my dad is and my cousin does it far a living)
The screen on your custom exhaust looks really restrictive. On roadkill he had similar mesh filters on his velocity stacks and said it killed 300hp on the dyno so he took them off. Your wheels are also so much bigger and heavier to accelerate fast, you have a lot of unsprung weight.
I think ill re-do the exhaust to make it staged to a higher inside diameter, then put on the open muffler this time. www.arcracing.com/rlv-4106-muffler-open-modified-1-5-16/
Yes the screen in that new part looks less restrictive than the drilled hole pattern in your current muffler. And if it's a larger mesh area on top of that that should help even more.
I went with a 420cc on my baja. First don't cut any tubes, the engine just needs a inch and an eighth "spacer" I built an "box" 1 1/8" thick set my engine on that and I also used a polaris cvt. It's like a boss hoss mini bike.
Ok. I have a similar build with a Tecumseh hs50. I am able to get to about 40mph with a 10 tooth sprocket on the CVT and a 50 tooth on the wheel. The engine dosen't feel like it revving up tho... Love the build man.
that baja HAS to be making close to 20 HP with all those mods...your friend is making about 9....maybe.....I think its time to tinker around with a few gear combo's
+au69miner the baja won't rev over 4100 rpms. I've been told it's the torque converter and gearing holding it back. I seriously doubt the Hp is even remotely close to 20. I'll be putting a race clutch on and messing with the ratios to fully take advantage of the mods.
I have a question I have found some stage 4 performance kits for $350 and it hat new carb,piston, rod, header, exhaust, rod barrings, and flywheel and says it revs to 7000➕ rpm. basically a rebuild kit but on steroids is it worth it and do have a say in it before I buy it
well, it didnt smoke before, but my daughter layed it over in a mud puddle and it smoked after that. It could be that the cylinder wall suddenly cooling caused some damage, but I am hoping that it is just running a little rich.
+KartFab I'm glad I didn't eat it either! I will be lowering the wheelie bar even more to try and keep the front end down more. A big part of it is the carb because it hesitates and then takes off and is hard to control. A fix in the works for that also.
i have a 1975 HPE cat mini bike with a predator 212 im going to try to find a 5 hp Briggs Flathead for it because nothing would go better with an old mini bike except an old engine
got lucky and found an engine kind of like what you recommended i dont know if its an I/C but it has bearings and its a 5 hp Flathead it was sitting on the ground at my local junkyard i gave it a few pulls and it sounded like it wants to run
cool! Those flatheads sure are fun to ride around. I ended up puttin a PZ22 carb on mine (china knockoff) for $13 and it required little tuning, no jet changes.
I went with a belt drive like that I changed the carb and turned my governor up on my Baja warrior 200cc wrote the number on the goose neck down and I got a moped sticker and made it street legal
dang, these little mini bikes aren't meant for the street. They are short and slow, but if you go much faster they don't feel stable. I'd be fine driving it around on dirt roads and pavement, just not where there were many cars. People in vehicles tend to subconsciously ignore motorcycle drivers.
KartFab Baja warrior's are basically the same size as a moped and you can get kits to make them street legal and kits to do speed limit just because it's fast don't mean you have to go that fast I had a mini chopper and they make mini choppers and pocket rocket bikes street legal
If kart-it could keep it under control off the line he would of won both races
true.
No suspension on bad road doesn't help either.
KartFab on that predator, when taking the governor off, do I have to upgrade the piston rod? I heard they bust after governor removal.
Sean hnizdil
connecting rod, and its a good idea if going over 5500 rpms
KartFab ok, in that case.if I am always gonna be over 5500rpm due to always going fast. Would I be better off just doing intake, exhaust and torque converter?
I'd like to see a wash mod! That motor sure is nice though!
haha yeah it is a little dirty
Lmaoo 😭😭
Heads up racing is always fun to watch, like Pinks, but for fun, no wagers.
You want the bigger mini bike to win? Take off Torque converter replace with a racing clutch with 15T and a 50T rear sprocket about a 3 to 1 gear ratio and the mini bike with wheelie bar will be seeing dust!
your belt drive on the Baja is like the one I used
I enjoyed the "Run what you brung" race, but I'm not too sure it was even. You weigh more and had larger tires. I bet if you had the Briggs on a similar bike, with similar riders, that old flathead would have kicked azz!
yeah the old flathead is good, but the flow and high compression of the OHV is unmatched. Flatheads get spanked nowdays.
KartFab you should do some videos on the race kart
yaaaaaas
Is the torque a verter better than a performance centrifugal for racing? I know you can change out springs and weights on the centrifugal to change the stall speed. Just curious.
+Racer X nope, disc race clutch lets you rev high and if you set engagement rpm to max torque rpm you get a better launch too.
Great racing video.
I saw those,I'm getting one for Christmas
Cool
Nice Race, Cheers The Dizz.
I expected kart-it to win because his is more lightweight and has the wheelie bar, but he couldn't get it off the line without either breaking traction or not keeping it in a straight line. But even though you have more weight, your rear tires are larger and probably grip better, and more weight can sometimes help with off the line acceleration.
Hes thinking about re-gearing or getting a bigger back tire to take advantage of the torque he is losing off the line.
Kartfab, did your header on the mini baja come with the threaded end for 1" RLV muffler, Or is it an adapter? Really like the idea of a threaded muffler instead of the clamp on type. Would like to find an weld on adapter for the GPS header and not spend 50 bucks on the clamp on one. Thanks, fun video, glad kart it didn't bite it.
IIRC i made the header myself out of 1" stainless tubing
@@KartFab thanks. Guess I need a bender and a welder. Nice job.
@@richmsx125 i didnt use a bender, i actually just purchased some 90 degree, and some 45 degree bends and welded them together
thats was a good race me and my buddy plan on racing our bikes sometime soon lmao race on my friends
Where did y'all go on the drag racing scene?
Different groups are trying to expand and make it work...
Just a local park/road. We are doing more stuff with Texas outlaw mini bikes at car shows.
thnx kartFab you helped me a lot through these videos because I am making a go kart out your videos , THNX a lot
I love love life on 2 wheels. I am going to race motocross today
I would like to see you guys install a vapor trail tech speedometer on either bike and calibrate the speed correctly❗
Change the drive ratio..... put a 12 tooth on the TC of the Roper. Kart It need some bar ends for behind the seat? I make them out of aluminum....... Have you seen the set I made for my Roper? Pretty sure I posted pics before my attendance slumped off......
What kind of carb is that and where can I find one? I have a 3hp flathead exactly like that one
except mine is a 5 hp flathead. as a rule of thumb, you take the intake valve diameter, take off about 2 mm, and that is the size venturi you want to put on a carb. I just took the displacement of the engine, and used a honda knockoff carb of similiar displacement engine. my 213cc briggs flathead engine took the honda gx200 carb. So a 3 hp has smaller displacement, so you may have to look at a small dirt bike carb like a mikuni or walboro (spelling im not sure of)
+KartFab Alright Thank you!
+KartFab how is that carb compared to the stock one when it comes to performance?
+Nick Cheshire I don't know
is the black mini bike w/ the wheelie bar a "CAT" frame?
im not sure
to Mr. kart fab: where did you get ur muffler end piece from???
1" RLV muffler
What drone was that?
+deathraydave gaming DJI p4
Where did you get your outerwear filter for your minibike
+Brock Morgan eBay
do you think it would be possible to build a go kart with 2wd out of a garden tractor frame with $75? is it possible to also put some kind of like flat bed or a box on the back so I can use it on my family's ranch? also, I'd like it to be under 50cc so that it is street legal. if this is somehow possible, let me know. (also I'm 12, so I'm not a very good fabricator, but my dad is and my cousin does it far a living)
It usually costs me about $300 to fix up a go kart so, to that I would say. Possible? Yes. Feasible? No.
Ok thanks
The screen on your custom exhaust looks really restrictive. On roadkill he had similar mesh filters on his velocity stacks and said it killed 300hp on the dyno so he took them off.
Your wheels are also so much bigger and heavier to accelerate fast, you have a lot of unsprung weight.
I think ill re-do the exhaust to make it staged to a higher inside diameter, then put on the open muffler this time. www.arcracing.com/rlv-4106-muffler-open-modified-1-5-16/
Yes the screen in that new part looks less restrictive than the drilled hole pattern in your current muffler. And if it's a larger mesh area on top of that that should help even more.
Did you already burn the rings out in Bronda?
+erik smith Naw, it still has great compression. 10 hrs on engine so far. I think the jetting is too rich.
Oh okay I changed my rings in my flathead and it never stopped smoking
+erik smith if it smokes really bad, it could need valves lapped or the valve guides could be wallowing out.
TIPS FOR BUILDING CHEAP GO KART/MINI BIKE
First tip. *Put 212 engine on it*
Second tip. *There is no second step because 212's rule*
lol, yeah pretty much.
I went with a 420cc on my baja. First don't cut any tubes, the engine just needs a inch and an eighth "spacer" I built an "box" 1 1/8" thick set my engine on that and I also used a polaris cvt. It's like a boss hoss mini bike.
What gear ratio are you running with the jack shaft?
+Zack Zeigler not sure about rear axle tooth count, but jackshaft has 8t
Ok. I have a similar build with a Tecumseh hs50. I am able to get to about 40mph with a 10 tooth sprocket on the CVT and a 50 tooth on the wheel. The engine dosen't feel like it revving up tho... Love the build man.
cool race😆😆😆😆😂😂😂
How fast does ur mini bike go?
about 45 mph, but I had issues with the engine (thats why its smoking)
Wow that’s fast!!
octane boast might help
A paint job on Jew fro's bike would make it look very professional.
that baja HAS to be making close to 20 HP with all those mods...your friend is making about 9....maybe.....I think its time to tinker around with a few gear combo's
+au69miner the baja won't rev over 4100 rpms. I've been told it's the torque converter and gearing holding it back. I seriously doubt the Hp is even remotely close to 20. I'll be putting a race clutch on and messing with the ratios to fully take advantage of the mods.
I want the one that kart fab did
I have a question I have found some stage 4 performance kits for $350 and it hat new carb,piston, rod, header, exhaust, rod barrings, and flywheel and says it revs to 7000➕ rpm. basically a rebuild kit but on steroids is it worth it and do have a say in it before I buy it
is it worth it? Depends on you. Value is dependent on the buyer, not someone else.
kartfab.... why does your briggs racing motor smoke?
well, it didnt smoke before, but my daughter layed it over in a mud puddle and it smoked after that. It could be that the cylinder wall suddenly cooling caused some damage, but I am hoping that it is just running a little rich.
I love how he's got this pristine and perfect minibike but forgot to put a fuel filter on.
Fort Worth!
Baja warrior mini bikes are good trail bikes I rode mine with a bunch of dirt bike riders a few 125's and a few 250's
You both won...lpve it
i just got lucky, Chris would have beat me every time if he could keep the front wheel down.
cool
Helmets?
Dude on the small bike sketches me out...
I'm glad Chris didn't eat it. Too much torque on the start.
+KartFab I'm glad I didn't eat it either! I will be lowering the wheelie bar even more to try and keep the front end down more. A big part of it is the carb because it hesitates and then takes off and is hard to control. A fix in the works for that also.
What is your job?
completely unrelated, i just love go karts and mini bikes etc.
I had a Baja warrior 200 cc and I also converted it to a belt drive and it was twice as fast 60 65 mph
dang. When are you uploading a video of it?
+KartFab I sold it last year
aww man. I have only been able to get mine up to 43 mph and it was scary.
you should make a racing mower
Thx
all that power need a new frame and wheels
I’d like to see you race my buddy Patrick he got a mini bike people call the big block bike Cus it has a huge block on it
im down
What happend to this Kart it fellow. Seemed to fall off the face of the earth.
This kart it guy is not doing videos, and he is still hanging around, just not doing any UA-cam stuff.
Bummer. His last vid left folks hanging.
Shit that fly wheel cost more than my mini bike and motor holy shit
manual clutch and nos kit
nos kit sounds good, i got a noram cheetah clutch already.
The other guys wheelie bar did not help him that much,or at all
put a turbo on it
K kool thx
Why is the Briggs smoking so bad?
+glennspeeds no idea. I'll have to pull the head and have a look. My daughter layed it over in a mud puddle so maybe that was it, who knows.
Put a mikuni on the briggs if possible
i really need to do that to help with flow. The honda carb is really restrictive. Its too rich at low rpms, and too lean at high.
i have a 1975 HPE cat mini bike with a predator 212 im going to try to find a 5 hp Briggs Flathead for it because nothing would go better with an old mini bike except an old engine
i might end up rebuilding my old retired 5 hp Flathead and using it that motor has been collecting dust in my shed for almost a year
See if you can find an I/C block. Cast iron dual bearing and will last longer
got lucky and found an engine kind of like what you recommended i dont know if its an I/C but it has bearings and its a 5 hp Flathead it was sitting on the ground at my local junkyard i gave it a few pulls and it sounded like it wants to run
cool! Those flatheads sure are fun to ride around. I ended up puttin a PZ22 carb on mine (china knockoff) for $13 and it required little tuning, no jet changes.
KartFab I took the cylinder head off my blown up 5 HP and bolted it up to the new one and it increased compression
I went with a belt drive like that I changed the carb and turned my governor up on my Baja warrior 200cc wrote the number on the goose neck down and I got a moped sticker and made it street legal
dang, these little mini bikes aren't meant for the street. They are short and slow, but if you go much faster they don't feel stable. I'd be fine driving it around on dirt roads and pavement, just not where there were many cars. People in vehicles tend to subconsciously ignore motorcycle drivers.
KartFab Baja warrior's are basically the same size as a moped and you can get kits to make them street legal and kits to do speed limit just because it's fast don't mean you have to go that fast I had a mini chopper and they make mini choppers and pocket rocket bikes street legal
Minibikes
1:41 MATTV2099
I guess you guys weren't concerned with Safety, no helmet really....bad example!
+Darrell Tiencken I want to win a Darwin Award someday.
OK GoB
First