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Thread: Boost bottle on yb100

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    Default Boost bottle on yb100

    Hi guys i have a 1992 yb 100 2stroker.... As u have have guess by my user name I am an Rx115/ RXZ fan...

    One of the many features of RX115 is the YEIS(Yamaha Energy Induction System) a.k.a the boost bottle.

    The boost bottle is attached to the intake manifold. It works as a temporary reserve for the air fuel mixture thata has been pushed by the piston during downward stroke back into the carb. This air fuel mixture can then be used in the next stroke.

    I want to fit a boost bottle in my yb 100. The difference is that rx has a reed valve engine while yb has rotatory valve engine.

    I have 2 questions.....

    1. Will the boost bottle work on YBs engine?
    2. Should i use an rx boost bottle or make one my self?

    Boost bottle on yb100 - d4d0034bf0fa6b4f44abc27287f9f158

    Boost bottle on yb100 - 074b85a320095986b8b132845e3cc30a

    Sent from my DROID RAZR M using PW Forums mobile app

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    I hope that the senior members like @hidalgo @KamranAslam and @vickytulla can help me

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    Most of the YEIS was precisely calculated induction tube.. size of a tube , vents, its calibration with valves..

    I am totally unsure how it would work on rotary, or if it would really give any +ve gain on YB or not...

    but their is not harm in trying, at least it will give a +ve placebo effect for sure !!!

    Its a research and research never goes in vain..

    Quote Originally Posted by rxlover View Post
    I hope that the senior members like @hidalgo @KamranAslam and @vickytulla can help me

    Sent from my DROID RAZR M using PW Forums mobile app
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post
    Most of the YEIS was precisely calculated induction tube.. size of a tube , vents, its calibration with valves..

    I am totally unsure how it would work on rotary, or if it would really give any +ve gain on YB or not...

    but their is not harm in trying, at least it will give a +ve placebo effect for sure !!!

    Its a research and research never goes in vain..

    Lol placebo effect... Ok ill try it.. I was wondering if somehowbi couldbget my hands on Yamaha's software to calculate the dimensions of the tube..

    Ive heard about this software on some forums.

    Sent from my DROID RAZR M using PW Forums mobile app

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    hahhahaha yes we all riders get that placebo efect specially when we do some thing to our bike.. awain he shak ho rha hota hai k farak para hai .. chaye koi farak na para ho..

    I am not really aware of the software, but I do remember reading about RX series that for each RX bike the size, dimension and even the total distance from chamber was taken into account to make it useful enough to see a power gain in spectrum.

    Quote Originally Posted by rxlover View Post
    Lol placebo effect... Ok ill try it.. I was wondering if somehowbi couldbget my hands on Yamaha's software to calculate the dimensions of the tube..

    Ive heard about this software on some forums.

    Sent from my DROID RAZR M using PW Forums mobile app
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    i don't think it will fit on rotary disc....as reed valves and rotary disc both have different working methods.
    still you have to increase the size of housing of carburetor to fit YEIS pipe and then the most difficult part to calculate the precise size of pipe(tube) and bottle.
    The first step towards knowledge is to know that WE are IGNORANT

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    the yeis is not that special as people think. Its just an expansion tank to take up the inertia of the mixture as its flowing into the intake and the intake port closes.

    This mix is then sucked in by the boost port as the engine comes onto pipe and the exhaust expansion chamber starts its sonic activity. This slightly widens the torque band

    The YB100 has a disc valve - there is no way you can add a boost bottle to it. At best you can reshape the valve and the port on the engine so it opens suddenly rather than slowly. The suddenly opening valve amplifies the suction signal and provides more mixture to be pulled in. If you are really hardcore you can reshape the intake port upwards so the mixture rams underside the piston - this provides a smoother and faster flow into the crankcase. This way the engine will sort of supercharge itself better when the engine comes onto pipe.

    If you want to understand the activity of the boost port on a rotary valve engine then look at a kawasaki KH125 (GTO125) engine, its rotary valve has a hole on the opposite side of the valve, this hole is for the boost port kick.

    Do not try to add to a 2 stroke engine, its a very delicate balance on which it works, meaning if your exhaust is not correctly shaped and tuned to the transfer and boost port mapping and also your carburettor setting then you can very easily destroy your engine.

    If you want the crazy supercharged pull from your 2 stroke then start with learning the engineering on how the engine actually works. Its addictive as it can produce phenomenal power.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    the yeis is not that special as people think. Its just an expansion tank to take up the inertia of the mixture as its flowing into the intake and the intake port closes.

    This mix is then sucked in by the boost port as the engine comes onto pipe and the exhaust expansion chamber starts its sonic activity. This slightly widens the torque band

    The YB100 has a disc valve - there is no way you can add a boost bottle to it. At best you can reshape the valve and the port on the engine so it opens suddenly rather than slowly. The suddenly opening valve amplifies the suction signal and provides more mixture to be pulled in. If you are really hardcore you can reshape the intake port upwards so the mixture rams underside the piston - this provides a smoother and faster flow into the crankcase. This way the engine will sort of supercharge itself better when the engine comes onto pipe.

    If you want to understand the activity of the boost port on a rotary valve engine then look at a kawasaki KH125 (GTO125) engine, its rotary valve has a hole on the opposite side of the valve, this hole is for the boost port kick.

    Do not try to add to a 2 stroke engine, its a very delicate balance on which it works, meaning if your exhaust is not correctly shaped and tuned to the transfer and boost port mapping and also your carburettor setting then you can very easily destroy your engine.

    If you want the crazy supercharged pull from your 2 stroke then start with learning the engineering on how the engine actually works. Its addictive as it can produce phenomenal power.
    ??.......
    Attached Images Attached Images  
    The first step towards knowledge is to know that WE are IGNORANT

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    Quote Originally Posted by Xulfiqar View Post
    the yeis is not that special as people think. Its just an expansion tank to take up the inertia of the mixture as its flowing into the intake and the intake port closes.

    This mix is then sucked in by the boost port as the engine comes onto pipe and the exhaust expansion chamber starts its sonic activity. This slightly widens the torque band

    The YB100 has a disc valve - there is no way you can add a boost bottle to it. At best you can reshape the valve and the port on the engine so it opens suddenly rather than slowly. The suddenly opening valve amplifies the suction signal and provides more mixture to be pulled in. If you are really hardcore you can reshape the intake port upwards so the mixture rams underside the piston - this provides a smoother and faster flow into the crankcase. This way the engine will sort of supercharge itself better when the engine comes onto pipe.

    If you want to understand the activity of the boost port on a rotary valve engine then look at a kawasaki KH125 (GTO125) engine, its rotary valve has a hole on the opposite side of the valve, this hole is for the boost port kick.

    Do not try to add to a 2 stroke engine, its a very delicate balance on which it works, meaning if your exhaust is not correctly shaped and tuned to the transfer and boost port mapping and also your carburettor setting then you can very easily destroy your engine.

    If you want the crazy supercharged pull from your 2 stroke then start with learning the engineering on how the engine actually works. Its addictive as it can produce phenomenal power.
    Yes i have planned to install a custom built expansion chamber but it will take some time to build... I have also considered porting but i dont want to ruin my genuine cylinder and I highly doubt there is a 2 stroke porting specialist in Karachi (p.s if there is, do let me know)

    Still there is no harm in trying the boost bottle idea...

    First i need to change the connecting rod of my engine then ill post some pics of the boost bottle experiment.

    Sent from my DROID RAZR M using PW Forums mobile app

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    Quote Originally Posted by rxlover View Post
    Yes i have planned to install a custom built expansion chamber but it will take some time to build... I have also considered porting but i dont want to ruin my genuine cylinder and I highly doubt there is a 2 stroke porting specialist in Karachi (p.s if there is, do let me know)

    Still there is no harm in trying the boost bottle idea...

    First i need to change the connecting rod of my engine then ill post some pics of the boost bottle experiment.

    Sent from my DROID RAZR M using PW Forums mobile app

    Im going to ask you this.

    how do you plan to add this boost bottle to your engine?? in the yammy rx/dt/yz engines the intake is through a set of steel reeds and the boost bottle is plumbed after the reeds but before the intake ports in the crankcase. In your engine the disc valve spinning inside its housing and has a spigot/nipple to mount the carburettor - unless you are planning to cast a new clutch side engine casing, disc valve housing and carburettor mounting and air chamber - this boost bottle cannot be added to your engine.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Hassan1991 View Post
    ??.......
    This port helps the scavenging of the crankcase as it provides a relief for the low pressure being created in the crankcase as the piston is on its downstroke and the mix is flowing through the transfer ports - as the mix is being pulled into the exhaust the flow also causes the boost port to start filling up even after the transfer ports are closed, as the mix is being rammed back from the exhaust, the boost port amplifies the tumble which causes the mixture to tighten up and prevent it stalling out. *this is why the boost port is aimed upwards and the transfer ports are aimed towards the center of the piston opposite to the exhaust port*
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    Im going to ask you this.

    how do you plan to add this boost bottle to your engine?? in the yammy rx/dt/yz engines the intake is through a set of steel reeds and the boost bottle is plumbed after the reeds but before the intake ports in the crankcase. In your engine the disc valve spinning inside its housing and has a spigot/nipple to mount the carburettor - unless you are planning to cast a new clutch side engine casing, disc valve housing and carburettor mounting and air chamber - this boost bottle cannot be added to your engine.
    I intend to drill a hole on top of the intake manofold coming out from the cluth casing/cover .. The carburetor will have to be moved back a bit

    Boost bottle on yb100 - 9048446878c7e5312af4770bfd54bb09

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    Quote Originally Posted by rxlover View Post
    I intend to drill a hole on top of the intake manofold coming out from the cluth casing/cover .. The carburetor will have to be moved back a bit

    Boost bottle on yb100 - 9048446878c7e5312af4770bfd54bb09

    Sent from my DROID RAZR M using PW Forums mobile app
    As I said you has to make a custom housing for carburetor.
    The first step towards knowledge is to know that WE are IGNORANT

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    Quote Originally Posted by rxlover View Post
    I intend to drill a hole on top of the intake manofold coming out from the cluth casing/cover .. The carburetor will have to be moved back a bit

    Boost bottle on yb100 - 9048446878c7e5312af4770bfd54bb09

    Sent from my DROID RAZR M using PW Forums mobile app

    much much better results can be achieved by working on the porting and scavenging.. Another reason the bottle is used is because the reeds take some suction to fly open - your engine has a spinning valve, it has more precise timing control for intake. All it needs is some nice dresswork and creativity to fatten up the power. In 2 strokes - the more power you extract the sharper and narrower the power band gets - this can become a challenge to control on the road. Its like riding a YZ125 in traffic (insanely useless) - but once you apply a load to it (like dirt) the engine will come onto pipe and probably spit you the first or second time.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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