If you have run your own test (real test), let us know so we can check it out! :) Claims prove nothing, testing prove something!

My dad is a retired mechanic who worked on and competitively rode motor bikes his entire life. I asked him what boost bottles do and his response was: "Help guys who don't know any better feel like they're doing something."

All the veteran 2-stroke guys swear up and down that they don't work, that's enough for me.

Finally a serious video on this instead of just ads and bs...

I think they work in very special cases and they have to be "tuned" per engine, its not just a bolt on power adder. they require planning and tinkering to get any gains or its a "fix" for an intake that has volume issues.

Thank you!!! Finally!!! Your video proved my theory that the boost bottle won't work well on a stock engine with stock parts. I've gone up and down for videos for 2 months describing it how it works but nothing!! Your vid save me alot of time and money. Your the man!!! Ill make sure this goes viral.

I built 1 and used the original 40mm intake like you tried,and drilled the same spot.I used the plan of matching cylinder volume with the bottle's.It cut the back-spit through the carb,but I saw no benefit.I replaced the intake with a CDHPower Reed valve and Did gain all kinds of torque.Happy Trails everyone,and Merry Christmas.

Very interesting video. I heard first about boost bottles two years ago. I drive a 250ccm 2-stroke MZ ETZ 251 built in East Germany and some people claimed that it runs smoother with such a device. Big 2-stroke engines do not run so well in idle (no stable rpm) and there is a problem when you run downhill. When you turn down the throttle the engine starts what we call in German "push jerking". I read that boost bootles will reduce both problems (no claim for more power or less fuel consumption). I installed a 200ccm bootled with a 12mm pipe between the carburetor and the motor. I was amazed how smooth it runs now in idle and going downhill reduces the jerking quite a bit. Probably a bigger bottle will be even better. I can confirm, that I have noticed no increase in power and also not less fuel consumption. So no need for it on small motors.

You do a great job really think it through on your tests and videos. I just came across you and after watching this video I smashed that like and bell. Keep up the good work

You have helped me so much with my build

Definitely can relate to that video not being any real proof of a boost bottle working I love how you go in depth and tell us and show us all the do's and don'ts for these engines or just your opinion thank you.

Great video as always man

You're vidios have great content brother! This one will be big, bet!

I rip my bike around like it’s a dirtbike 😂,

Hahahaha. First thank for your genuine videos. Your not out to promote or trash talk....just what an honest opinion for your experiences. I am a first time buyer of the 66cc/80cc Amazon China 2 stroke. I've been tinkering for just over a week....tore the motor right down the day it arrived (I took small engine repair in junior high school so I know how most factories pump engines out). For whatever reason this boost bottle article or perhaps an ad non the less I got sucked in(anything I can do for just a little bit more efficiency and ummmph). I sure wish I had see this video sooner. Dang. No matter how I work it I do need the offset intake. I noted how you tested for leaks on the welds. Thank you. I had another method in mind and yours is next to zero extra dollars and effective. I'm in the process now of mounting a Bluetooth boombox I diy'd into the frame as well as wiring in (totally separate from the bike's electrical)an Amazon headlight and rear signals w/tail light to a set of actual Street bike handlebar controls. I noticed you have a video on electrical. Just going that way now. Again thank you for your time and efforts to get information out to inquiring minds. From a covid free Canuck Cheers.

Thanks for saving me the time and money. I agree that it should be able to convince me without having to find some minut mileage or acceleration gain. I think you got it right and it helped a few mistuned motors but if it was what we wanted it to be their would be vids of people drastically improving their acceleration and the crashes likely to occur if they had a bolt on nos kit for a 49 cc 2 stroke. For now only highly competent people are the only ones making insane lawnmower motor bikes but soon enough someone will make a conversion kit to run jet fuel or something nuts and the fun will begin.

Boost bottle and expansion chamber, also the size of it matters. Combining them is like the window piston and Reed cable.

I tried the same kit on my one piece cylinder engine and yes a tuning nightmare began.i did get it tuned and ran it for about 100 miles now.the only noticeable gain I have is I gained about 10-15 miles per tank of fuel..no real loss or gain in torque or top speed.i have chose to keep it on one of my bikes for the extra mikes per tank although there is alternatives to get more miles per your ride I have already paid for it so might as well use it lol good video as always 👍

Great video thanks so much for making it! My new build is holding up pretty good. I built it based off your yd100! I got a road master granite peak like yours, got VERY lucky on a motorized bike kit. Got everything on and today drove through the snow! Very fun build! After watching your videos, you encouraged me to build one. Best decision I’ve ever made! Thank you so much!!!

It worked for me! With a seeutek pk80. gas mileage on mine improved greatly!

I love my seeutek kit also. runs really smooth. i have a kent bayside also with a square head. keep up the great work!

Good work! Thanks to share the information and experiences!

Very helpful, thanks!

They're made for tuning a reed set-up. You're the man brother! Top.

The problem i see with this test is the intake tube is different then what you had on the bike. some years ago I took my intake tube and added a boost bottle to it. i made my own bottle out of pvc pipe and messed with the size of the bottle. I ended up with a much bigger bottle then what you get if you buy one online and it worked great. it effected the low end and high end alittle but had a very noticable effect on how smooth the engine ran. I then changed out to a reed valve and it was much better.

Great video. I know a little about the bike motor and how it pulls the fuel from the carburetor into the sump of the motor when the piston goes up, the crank shaft then get compressed by the downward movement of the piston. As the piston travels up again it release the pressure up and into the cylinder for the compression stroke before the spark turns the gasses into the power stroke. So you have constant pressure then vacuum faster than a fly flaps it wings for lift. In doing so, the gasses can vomit back out the intake as well as suck back from the exhaust. Hence having a tuned exhaust gives just the right amount of back flow restriction, in turn the flow of vapers stops fluxing as violently, So the boost bottle is thought to take up some of the fluxing or vomiting back fuel as well. I believe for a boost bottle to work. You need a diaphragm inside the bottle to throw the vomit of fuel back. Aaa the missing link to the boost bottle. Try this if you can find one. a soft rubber ball you can crush flat in your fingers, It must fit the boost bottle. This might give the bounce back the bottle needs. Good luck.

I ran a boost bottle for a while and noticed a smoother ride and better mpg but also a loss in power

Thank you, I had questions of how and why boost bottles worked... it's a start....

I knew they were junk. I've never seen. 1 before these engines. Never needed 1 buildin chopper's, dirt bikes, nor anythin really. & I've been buildin & repairin bikes a long time. I'm 52 yrs. young.

I've been around hocus pocus products... this one takes the cake LOL. Huge companies like yamaha tried making it work a long time ago, and they found that these resonant bottles won't do much at all and for the production to be viable it has to make some margin of increase. Instead... they found it to be a fool's gold. Thanks for making this video. It could help a lot of people save up their money to make actual change in their machines instead of buying this hocus pocus product.

I put the boost bottle and high performance carb on. My low end was terrible so I popped the end off my stock muffler and now I'm happy. You need lots of air flow, at least at my altitude of 5,000 feet.

Video definitely helped me out,thanks man. I wasn't sure about the things,but everything you said makes total sense. I won't be getting one of these. No matter how cool and shiny they look lol

thank you, you saved my money!

Thank god there is someone else who lives in reality...just 1 of the reasons I subscribe to this awesome channel. Boost bottles only boost egos not performance...I wanna see NOS and CO2 inflators.

Great video I was on the fence about it just because for my latest build I realized I will need the offset intake. Obviously snake oil, wouldn't want to lose power to gain 1 mph

Nice video but I had that same intake without the hole in it for the line and that seriously hurt my bikes throttle response and it would usually bog out and die. I found that out the hard way lol back when I didn’t know enough about how 2 strokes worked and air doesn’t like going through corners!! Keep up the vids

Honda puts the accumulator (boost bottle) connection between the carb and the airbox for a 2008-2009 CRF230L. I have tried my CRF230L with and without the accumulator connected and there is a definite difference....but again the connection is between the carb and the air cleaner NOT between the carb and the cylinder. Plus the CRF230L is a 4 stroke.

Do a vid with dual carbs😁

I know it's been a while, but I just built my first bike a few days ago, so I'm watching everything I can. Anyway, I JUST saw that "squeezed the tube" video like 10 min ago. Might be my first motorized bicycle build, but far from my first motor, and I KNOW that the positive effects of an intake booster - on a motor this small - would be so negligible that you would need technical equipment (and very precise tuning) to find it. At most - slightly improved MPG and barely cleaner emitions - NO performance gain. I seem to get the most useful, or worthwhile, tweaks from your videos. If I find a good idea somewhere else, it's usually something I've already heard from you. Thanks for all the work and good info.

Hey really like your video's helpfull and entertaining

Nice video. Malossi makes one of those ,that might have a reason. Because they add a spring inside,to compensate. Don't know how much it counts,but .. :)

You are going far.

Oh and I like how you ended the video got two of those parts on my bike huffy cranbrook with zeda tripple 40 motor and gt6 head

Model airplane engines and 2 cycle motorcycles use similar principals in their design the difference is that crankcase volume and shape produces the pumping effect to move fuel/air into the cylinder. I think boost bottles went away because engine designers got better at the volumetric flow design. The only thing i have ever see a boost bottle is improve idle and they are far larger than a co2 cartridge. . The boost bottle set up on these bike engines won't work for a specific reason. In order for a boost bottle to work the intake and exhaust gas pulse have to be matched. The exhaust volume is far larger than the intake. Look at a tuned pipe exhaust. Have you ever wondered why it is so big. That is why tuned pipes are used on higher performance engines. 2 cycle engines have to have back pressure to have a good power band. The exhaust pulse heads back to the exhaust port as well as leaving the pipe.That return flow holds more of the incoming intake charge of air/fuel in the cylinder. That is called scavenging. Now if you attach a hose to an intake you have a vacuum source. That bottle becomes a vacuum tank. I saw in the video the guy pinch the line and it dies. I think there is a vacuum leak and a very rich mixture. If you cut down air flow by pinching the line you just choked the engine.That is why it died. By adding that line you just made the intake volume bigger, now that will give you a lean mix unless you richen the carb mixture. That part is closed off but not the rest of the intake But it is dead space. You now have the volumetric equivalent of a hotdog in a hallway. I think everybody needs to stop hyper focusing on the boost part of the power process. This is a cheap Chinese engine Not a Celica GT engine! The best gains to be had is by cleaning up the ports and making sure the intake pipe has a good seal, look to see if the pipe is aligned with the intake port . My engine was off by intake pipe was mounted 1/8 of a inch So i got lousy airflow and a perpetual lean condition. The factory pipe is pretty good but if you want it better get a tuned pipe exhaust. Put a nkg spark plug on it and Get a real ignition wire and install it on the coil.It will run much better. My dad had a old mechanic that worked on his cars used to say keep it simple cause if you are fixing it all the time it is as worthless as a turd in a bucket of hammers. He is right. Make it dependable and you will have more fun. These are my thoughts on this subject.

See, I didn't think it would work too well if any. However I feel like it needs a very specific set up to get anything out of the boost bottle

I tried one on my gas bicycle engine too a while back. I didnt notice any improvement so removed it.

6:00 it doesn’t prove it works or doesn’t, it’s to show how to make a poor man’s kill switch😂😂 Love your videos❤️❤️ and I’m thinking about making a “short” video on a boost bottle as well since I’ve never tried one before! Thank you for the knowledge!!

I never thought boost bottles did anything. Your 100% correct

Im installing a case reed on a new yd 100 at the moment. CHD power carbon fiber petals with polished outer case. PWK 21mm carberator with a ZM 65 expansion chamber p y. Straight shot to the crankshaft and right up to the tranfers. Standard cylinder built for low end power but can breath too. I trued my crankshaft by hand and hammer. Almost perfect balance. I use a dial indicator on the bearing race of the crank then spun it and set it.

Nobody's ever accused Bikeberry of being honest about all the products they sell. They sent me a bum $100 4 store transmission. And then refuse to make it right after sending them numerous pictures upon their request. I hear a lot of people talk trash about gas bikes, but they always been straight with me. Bikeberry not the case.

Good old Motocross Action Magazine!

The only analogy application of anything I know that anywhere close to a boost bottle is on a vortex Chevy. The intake tube has a bulb designed into it, but if you look at the opening to that void to the intake is as big as the tube itself. So a hose isn't going to transfer or balance any pulse happening in that area. Even Chevy guys toss that and K&N it, which doesn't have a boost chamber void thingy. Snake Oil 😆

Whenever you have a tight spot where an Allen wrench won't fit because it's too long, you get your grinder or Dremel with a cut-off disc and trim the short end of the Allen so it can fit the nut in that tight spot. Make sense ?

I have a 100cc bike motor on a aluminum frame trek mountain bike and it only top out at 20mph do you have any recommendations

You should buy a nitrous kit

Will you be making a video of the new exhaust muffler and that I think it's a new sprocket adapter looks different would that be for this Friday coming up?

There are *ball-end* Allen Wrenches, Bondhus (and others, possibly) brand.

I can't stop laughin' Good to see you. I got a side mount 24v electric kit & a folding 26" bike, both brand new. Gonna play with that for awhile.

Fill the bottle with race gas and put a valve on the top so when you open it it dumps into the engine.

Great video, very much appreciated! Hope you read this and help me understand something. I built my first bike, lots of fun and all that. Have a 44 tooth sprocket and an HP carb...but can only get to 22 p Mph best speed. HP carb only has 1 screw for idle( I'm assuming) so should I focus on a larger carb jet? Appreciate any advice, thank you!

Never heard of a boost bottle until I got into motorized bikes, I was a dirt bike and 2stroke Kart racer and never saw anything in my time, now that was back in the early eighties to mid nineties

It was so hard for me to find a dang intake pipe without the boost bottle. The previous owner of my bike just bought one and taped off the hole

Looking for some ideas to boost performance on my China doll as I live in the mountain range and need uphill performance. Guess I'll be skipping on the bottle

I have boost bottle on my bike when I installed it on my bike and did have a difference in my performance it actually increased my speed about 5mph faster and was able to attach it to the 40mm neck for my carb

I tried that same boost bottle kit a while back and mine also came with pinholes in the intake manifold.

1st off did you start the 20ml test with an empty carburetor? As the 2nd half of the test the carb was empty and you put in 20 ml that 20 ml had to fill the bowl and line that was full on the first part? Do you understand me? Boost booths work by smooth out the pulse on a piston port. Thus leaning out the mixture. Did you notice less fuel puddling in the air filter? I did. I went from a 55 jet in my sha to a 62. But it got better mpg.

What color is that on the Cranbrook? Did it come like that or did you paint it? Love that color of blue

Think water hammer. Most water pipes in code have hammer arresters. Those have pipes reaching them the same size as the pipe. You'd need an actual tee. Just making your intake longer would do the same thing. If those work, then your intake needs rework. Just use a reed valve. Same thing. Keeps it in the crankcase.

Does it act like a reed valve sorta? Helps you increase speed at begining and then it keeps going normally?

I ran a boost bottle stock NT carb and it ran fine rode the hell out of it. But way it works most 2 strokes on compression will spray out fuel and air mix out thru the air intake. Boost bottle catches the fuel and air mix and puts it in on the next cycle

Good video I heard about these boost bottles are they any good

Will I suspected when I saw him for sale that they weren't anything special because I've never heard anyone on any of the forms that I look at suggest using such a thing as a way to gain performance or speed or Torque or anything else so you just confirmed my suspicions but I appreciate it because I'm not I'm really a mechanic and it wouldn't be the first time that I was wrong which is why I watched your video when I saw thank you good video I like how you tried all the different angles just to see if you were doing anything wrong

The video you were talking about is thunder head 289, he is a smart guy but if you watch his videos on the motorized bicycle kit you can tell he doesn’t really know much about two strokes he is good at working on old cars though lol

What if the motor revs up when you pinch the hose?

That thing that gets me thinking is, how do we even know that they fill those bottles with nitrous oxide from the factory? I noticed in your video that the "boost fuel" flowing through the clear tube was a liquid. Nitrous oxide by nature is actually a gas. The only time it is in liquid form is when it is mixed with gasoline, called a wet trigger system, which you didn't have on this setup. I greatly appreciate this video! You have definitely changed my mind. I almost bought a boost kit for $100!!!!! Thank you so much!

What do you think of the ANBULL motor kit??? Have you tried it or heard anything about it

ARRRRRRGGGGG JB weld man!

I thought maybe the boos bottle intake thing might catch the carb back spray at high revs but yah that other guys video didn’t explain anything except how to shut off your bike with it

This video helped Buddy. I was thinking of getting one and.... Not now LoL

Hey hover! Love your vids. That fuel resistant sealant... what was that by chance?

Also I might add that grinding the bent end of a Allen wrench down helps to get that bolt for the offset intake tight

Hi LA, DO YOU HAVE A RDS HAWK?? Thoughts on tbe bike? I'm thinking about getting one delivered.

You are creating an unnecessarily strong turbulent flow in the intake manifold with that which definitively affects the combustion enough to lose a mph. The problem is clear when you know about how important it is for the vaporized mixture to enter and exit the chamber without facing any obstacles in the way.

When starting my bike I usually get it running and rev it a little so it doesn't die stop the bike and rev it until it will Red line without dying and that's how I know it's warmed up sufficiently

Personally I have bought 4 motoos kits and I like them (knock on wood) they haven’t given me a single problem

Need to cut end off of the bottom of the boost hose connecter it could be blocking the flow like you said LA Hover

I love your show I learn a lot from you what not to do LOL 😮 if people are worried about fuel mileage they need to get a horse. The little bit of fuel these things use people complain about. They shouldn't be.

Oh god boost bottles for me have been a vacuum leak nightmare. I tried one and got a super rich fuel mixture, ran good at lower to mid rpm but it wouldn’t wind out :/. I tried different jetting as well with the stock carb. If the stock carbs had a fuel mixture screw. or if the bikes came with a more complex carburetor. I’m sure someone could get them to work better than us average joes. I found that a richer jet works good for high end with the boost bottle but it won’t idle well (fouls plug). Edit: I didn’t notice much fuel efficiency difference with my tests. Just a weird power band

Just a thought An on off switch for the flow to bottle. Once up to speed switch it on? Just a thought.

I put a boost bottle on a 50cc Moped and it sucked. I had to adjust everything and it never ran as quick. Looked cool though.

i had to put two on get the more low end effect for torque most part they say give more gas miles 2 thumb up

Do you realize how long it is going to take for this booster bootle idea to finally fade away and be forgotten? 100 loooong years.

Ur a smart guy👍

from where can i buy

My little 80cc already does 50 mph so I don't really want to mess with that

Is it okay to use the expensive fuel in these bikes? My engine seems to like it slightly better.

From what ive seen, boost bottles just help with back pressure on two strokes by creating a consistent vacuum. So it wont really do much past about half throttle. And i believe reed valves do the same thing, but alot better, making them pointless.

oh this, yeah, its used for Nos injection kit (go kart) Amazon. Handlebar trigger to manifold and thats the boost. Toss the bottle and use the line for the Nos for quick boost. Bottle use needs to go to crankcase not in manifold. You might as well soak all your old carb filters in gas and stuff it inside boost bottle(BBR BOOST bottle has cap that unscrews on both ends with o-ring seal... beautiful CNC work btw..) anyway, and use fumes...of anything....fart into it...get a genuine temp boost....but if you do that put a valve on manifold...to nullify system if you cant collect another use for bottle: make a fuel reservoir including the old supercub petcock with a reserve(Fuel Gas Petcock Replacement for Honda CRF 250 450 X 250X 450X Petrol Valve #H64) Idk -_- heres a joke: WHAT KIND OF TEA IS HARD TO SWALLOW? REALITY TEA HEE HA HA :) Falco - Rock Me Amadeus

With that rationale & I don't know how familiar you are with car stereos but back in the day line drivers were big! And now you don't really see them but they still work! Yet everyone knows about amps but you almost never see line drivers! They boost line voltage coming from the head piece(radio) before getting to the amp! Boosting from an average of 2 volts, up to 7 or even 14 volts which makes a massive improvement! But yeah with that rationale ,well, yeah! All that said, I've wondered about const bottles myself and I remember that vidio that you mentioned!

What size is the exaust manifold on the motoos?