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Thread: Help : RX100 sound reduction ?

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    Exclamation Help : RX100 sound reduction ?

    Hi All,

    This is my first post in this forum and would wait for valuable replies of our fellow member for a concern regarding my RX100.

    I have a RX 100(91 Model),I love the way it sound but I would like to reduce the sound of RX100. I know some of you may be suprised by this however I am planning to commute to my work place.

    I was recommended to use RX 135 muffler but when I did that the sound only increased.

    Used Glass Wool but after few days, the sound would change(oil damped Wool).

    Now I have run out of options, please provide your suggestion.

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    Using a RX135 silencer or RX135's core for RX100(A part inside the silencer which is the important part to reduce sound) will only increase the sound.
    Please check whether the core used inside is OE core it is very difficult to find a OE core for RX series. OE core will solve this problem.
    Second check whether any alterations is made in the core. Normally there will be one cut dummy followed by two full dummy they will normally block the sound if anyone of them is removed then there is a probability of increase in sound...
    Please check these two cos these are some of the major reasons for excessive sound in RX bikes
    Last edited by Dinesh.P; 06-26-2012 at 01:17 AM.
    Yamaha RX100 (1993)
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    ^^^ also check if your cylinder and head has the rubber inserts between the fins. They are there for a reason.
    Only a biker knows why a dog sticks his head out of a car window.

    Multum in Parvo - Much in Little

    "Yes, it is FAST! No, you CAN'T ride it!" - http://www.xbhp.com/talkies/general-...a-300-san.html

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    Quote Originally Posted by pv1984 View Post
    Hi All,

    This is my first post in this forum and would wait for valuable replies of our fellow member for a concern regarding my RX100.

    I have a RX 100(91 Model),I love the way it sound but I would like to reduce the sound of RX100. I know some of you may be suprised by this however I am planning to commute to my work place.

    I was recommended to use RX 135 muffler but when I did that the sound only increased.

    Used Glass Wool but after few days, the sound would change(oil damped Wool).

    Now I have run out of options, please provide your suggestion.
    RX100 OE Silencer (Core) is available from YASS for Rs. 152/-. Usually when the core is altered the restricting crown caps are removed for fancy screams. Or could be that good one from your bike is replaced with another. This is not a big issue and you can calm the exhaust note considerably.

    Options:- 1. Try changing the silencer (core) and run the bike to see the difference.
    2. Remove the Muffler assembly (whole chrome pipe) and keep it safe at home and buy a new one, costs around 1900/-. I'm sure it will be the ultimate solution if the above did not work.

    Where are you from?

    Quote Originally Posted by Dinesh.P View Post
    Using a RX135 silencer or RX135's core for RX100(A part inside the silencer which is the important part to reduce sound) will only increase the sound.
    Please check whether the core used inside is OE core it is very difficult to find a OE core for RX series. OE core will solve this problem.
    Second check whether any alterations is made in the core. Normally there will be one cut dummy followed by two full dummy they will normally block the sound if anyone of them is removed then there is a probability of increase in sound...
    Please check these two cos these are some of the major reasons for excessive sound in RX bikes
    Dinesh - I've seen it all types of silencers/mufflers. The new ones available will have atleast 3 crown caps welded, which considerably reduce the beat and sound little mellowed down. However, over a course of time, due to carbon deposit might get into a note (sweet/harsh) depends!

    Quote Originally Posted by abhimanyu31 View Post
    ^^^ also check if your cylinder and head has the rubber inserts between the fins. They are there for a reason.
    That's for the vibrations and little they do restrict the loudness of exhaust note.
    RX100 1996 | Karizma 2004 | Karizma-R 2011 | RXZ 1999 | RX 135 1998 | RX 100 1993 | CBF150 2005 - 2011

    2012 - Meghamalai | Kuttralam | 2011 Ooty | Munnar | 2010 Point Calimere | Horsley Hills | Yercaud

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    Quote Originally Posted by SriramEfunds View Post


    That's for the vibrations and little they do restrict the loudness of exhaust note.
    Partially true. Yes it is to restrict the resonance that the cooling fins create due to the unique nature of 2 stroke combustion process (happens with 4 strokes also, but to a far lesser degree and intensity). However, you seem to be forgetting that resonance creates its own sound wave which while not greater than the exhaust note, adds to the over all sound. No pun intended, if any doubts, try resonating a tuning fork.

    This resonance was one of the reasons why early 2 strokes were call rin tin tin engines.
    Only a biker knows why a dog sticks his head out of a car window.

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    Quote Originally Posted by abhimanyu31 View Post
    Partially true. Yes it is to restrict the resonance that the cooling fins create due to the unique nature of 2 stroke combustion process (happens with 4 strokes also, but to a far lesser degree and intensity). However, you seem to be forgetting that resonance creates its own sound wave which while not greater than the exhaust note, adds to the over all sound. No pun intended, if any doubts, try resonating a tuning fork.

    This resonance was one of the reasons why early 2 strokes were call rin tin tin engines.
    Sorry Sir, I don't buy your theory here as a possible solution for the thread starter. However, he's made very clear that there is a problem with the silencer /core or to change the muffler assembly in worst case. The rubbers that you mention shall minimize the vibration emitting from the engine which is quite irritating, but will not mellow down the exhaust note.
    RX100 1996 | Karizma 2004 | Karizma-R 2011 | RXZ 1999 | RX 135 1998 | RX 100 1993 | CBF150 2005 - 2011

    2012 - Meghamalai | Kuttralam | 2011 Ooty | Munnar | 2010 Point Calimere | Horsley Hills | Yercaud

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    Ton's of thanks to Dinesh.P, abhimanyu31, SriramEfunds for all the valuable suggestions, sure will try them out.

    @SriramEfunds - I live in bangalore(Near Indiranagar).

    I have been on the look out for a good mechanic for quite some time. I have visited 3 different mechanics but none of them have been able to resolve this issue. All of the give me the reason that its RX and it can't be any bit quiter than what it is already.


    Quote Originally Posted by SriramEfunds View Post

    Options:- 1. Try changing the silencer (core) and run the bike to see the difference.

    2. Remove the Muffler assembly (whole chrome pipe) and keep it safe at home and buy a new one, costs around 1900/-. I'm sure it will be the ultimate solution if the above did not work.
    As per Option1, you are suggesting changing the muffler(pipe at the end of exhaust) to a new one ?

    Option 2, changing the whole silencer(exhaust pipe) which costs around 1900. Can you confirm if the ones for Rx100 is available in the Market ?

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    Quote Originally Posted by pv1984 View Post
    As per Option1, you are suggesting changing the muffler(pipe at the end of exhaust) to a new one ?
    Yes. That experiment will not cost much.

    Option 2, changing the whole silencer(exhaust pipe) which costs around 1900. Can you confirm if the ones for Rx100 is available in the Market ?
    If the above did not make any difference, you can think of option to replace with the new one which will have RX/RXG on the part number. You'll not get RX100 specifically. This RX/RXG Muffler assembly is common for RX100, RXG, RX135 4 Speed model.

    Part No. 36LE47101000
    Description: MUFFLER ASSY/RX/RXG (Chrome pipe)
    Costs: 1900/- approx

    Part No. 36LE47532000
    Description: SILENCER EXHAUST (Core)
    Costs: 152/- approx

    Hope this helps!
    RX100 1996 | Karizma 2004 | Karizma-R 2011 | RXZ 1999 | RX 135 1998 | RX 100 1993 | CBF150 2005 - 2011

    2012 - Meghamalai | Kuttralam | 2011 Ooty | Munnar | 2010 Point Calimere | Horsley Hills | Yercaud

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    Quote Originally Posted by SriramEfunds View Post
    Yes. That experiment will not cost much.



    If the above did not make any difference, you can think of option to replace with the new one which will have RX/RXG on the part number. You'll not get RX100 specifically. This RX/RXG Muffler assembly is common for RX100, RXG, RX135 4 Speed model.

    Part No. 36LE47101000
    Description: MUFFLER ASSY/RX/RXG (Chrome pipe)
    Costs: 1900/- approx

    Part No. 36LE47532000
    Description: SILENCER EXHAUST (Core)
    Costs: 152/- approx

    Hope this helps!
    Thanks for your prompt reply, I sure will try this at the earliest. Is there someone/some place that you would recommend where i can buy this from ?

    I am adding the picture of the bike, as you can see the silencer/exhaust is in black. So would I be able to find the one in black too ?The picture was taken about 3-4 months ago.

    I am thinking of restoring the bike(in 1-2 years) to the original Black-chrome combination(Initially wanted to go for a complete Black look where the rims,engine and every thing would be covered in black, but not sure if I want that). However when i did speak to a mechanic he said get it earlier as the parts availability will be a issue, can some suggest waiting for 1-2years makes sense ??

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