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**antz.bin** · 06-26-2012, 12:12 AM

Query Approved

**Dinesh.P** · 06-26-2012, 01:14 AM

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

**abhimanyu31** · 06-26-2012, 02:27 AM

^^^ also check if your cylinder and head has the rubber inserts between the fins. They are there for a reason.

**SriramEfunds** · 06-26-2012, 02:58 AM

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?

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!

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.

**abhimanyu31** · 06-26-2012, 09:10 AM

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.

**SriramEfunds** · 06-26-2012, 11:42 AM

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.

**pv1984** · 06-26-2012, 04:46 PM

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.

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 ?

**SriramEfunds** · 06-26-2012, 05:47 PM

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!

**pv1984** · 06-26-2012, 06:17 PM

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 ??

**SriramEfunds** · 06-26-2012, 07:21 PM

Two stroke era is over. So what ever spares you'll find now might not be there in future. So the decision is yours.

**Dinesh.P** · 06-26-2012, 11:31 PM

Originally posted by pv1984 View Post

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.

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 ?

If you live in Bangalore the best place to go is DTW Yamaha in Shanthi nagar they are the masters of two stroke Yamaha's and they even make performance accessories for 2 stroke Yamaha's. So when you look for a good place go with DTW

**asif** · 06-27-2012, 12:39 AM

^^^DTW charges a BOMB for any work, almost double for everything and for what reason is beyond my scope of understanding. If you want to go in for something really radical and yet safe. try the tried and trusted RDD - Mr. Chinoy. People have different opinions about him,I myself never done business with him, but is there is someone who knows how to tune 2strokes its him. Can't guarantee that you will like his attitude though.

For the silencer trouble, simply ask or get the silencer cleaned. It called "burning" here in Bangalore, it will burn all the oil and make sure to "burn" the muffler too. Costs about 200-250 bucks. The crome will not be effected, but incase you have the silencer powder coated, forget about the powder coat. Adding a 135 muffler altered or stock will never reduce the sound and adding glass wool over it like adding oil to the fire. The bike will run super smooth and no noise, but initial there will be a lot of smoke to live with, i must warn you.

P.S why you want to reduce the sound of the bike. Hell i make sure that am coming when i arrive on my 100.

**NitinGirish** · 06-27-2012, 10:21 AM

Stay away from DTW. The oldies there have left and the work done is shoddy. If your flute is damaged then installing a new one is the only solution and for that you needn't go to DTW. Any local mech can do it.

I am not sure how quiet you expect RX100 to be though. If the exhaust assembly is not damaged and the sound you are getting is like that of any other RX100 then I suggest you don't meddle with it.

**pv1984** · 06-27-2012, 05:13 PM

Originally posted by asif View Post

^^^DTW charges a BOMB for any work, almost double for everything and for what reason is beyond my scope of understanding. If you want to go in for something really radical and yet safe. try the tried and trusted RDD - Mr. Chinoy. People have different opinions about him,I myself never done business with him, but is there is someone who knows how to tune 2strokes its him. Can't guarantee that you will like his attitude though.

For the silencer trouble, simply ask or get the silencer cleaned. It called "burning" here in Bangalore, it will burn all the oil and make sure to "burn" the muffler too. Costs about 200-250 bucks. The crome will not be effected, but incase you have the silencer powder coated, forget about the powder coat. Adding a 135 muffler altered or stock will never reduce the sound and adding glass wool over it like adding oil to the fire. The bike will run super smooth and no noise, but initial there will be a lot of smoke to live with, i must warn you.

P.S why you want to reduce the sound of the bike. Hell i make sure that am coming when i arrive on my 100.

@asif - Thanks for all the information provided. I felt the same about DTW after talking to couple of people around. As far the silencer goes its coated in black(must be power coated).
I was never for Glass wool as it gets damped with Oil in few days and I really don't feel good about that and yes the performance does go down....so I have taken it off completely.
I am planning to get a new RX100 muffler and replace it and check

I seem to have a bigger problem,

the mileage seems to have gone from 33kmpl to about 20 kmpl

right now after service(1 month ago). The reason for service was vehicle was leaking oil and I wanted that fixed but mileage has taken a big hit. The fuel leak did not stop, another mechanic fixed it by replacing a faulty "Float Pin" but mileage is come down drastically.

Any inputs will be appreciated.

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Help : RX100 sound reduction ?

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