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Old 11th May 2006, 20:21   #1
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Cool Increasing the fuel efficiency of a Yamaha RX100

Hi,

I have a Yamaha RX100 and am not happy with its fuel efficiency. Please share tips on how to increase the kpl. Thanks

Last edited by GTO : 28th December 2010 at 10:00. Reason: Renaming
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Old 11th May 2006, 22:23   #2
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get it tuned and ride is sensibly,the rx's were never made to return amazing kpl figures but were decent enough.
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Old 12th May 2006, 11:36   #3
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i think 35 - 45 kmpl it should give u, riding it sensibly. But if i may say, do always want F.E in these bikes? Rx100 , one of the best bikes i like to rip.
But anywayz nuthin better than driving sensibly. Clean ur Carb, Get it tuned, Mantain cosntant speeds should give u good F.E. BTW which model is yr Rx100?
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Old 12th May 2006, 12:17   #4
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Dont even think of increasing FE on an Yamaha RX series. You will end up running the engine lean and damage its parts. Best to leave it to the stock setting. The bike is not meant to deliver good FE. It wasnt designed to do that.

You cant buy a race horse and give it a donkey's diet!!!! Can you?? The same applies here.
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Old 12th May 2006, 16:51   #5
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Maintain proper air pressure for tyres, drive slowly....(something difficult to do in a rx ). Get the bike tuned for FE and yes put back the original Flute in the silencer and go back to the std rear rim and tyres if you have got it Modd .
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Old 12th May 2006, 18:35   #6
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Ride slow and put a smaller jet in carb i believe 110 or 140 it will give you around 45-48 KMPL
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Old 12th May 2006, 20:13   #7
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maintain economy speed 40-60, avoid unneccesary gear changes, duntry to rip it, clean the carb n fine tune it with a good mechanic,
or
buy a 4 stroke... that will make it the job simpler
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Old 23rd May 2006, 00:00   #8
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use acetone @ 2.5 ml per liter and see the difference!!
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Old 27th December 2010, 18:01   #9
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Default The Yamaha RX100 : Optimizing fuel efficiency.

I'm new here, and this is my first post in the Team-BHP forum. So here goes.

I've been owning an RX100 from around 4 months. I use it for casual trips around the suburbs and riding to college and back (approx. 45 km round trip)
Currently I'm getting around 22-25 kmpl (don't know how it ranks up)
My mechanic is Imtiaz in Bhandup (Mumbai) near Nirmal lifestyles.
Don't know if you have heard of him, but he does a good job with the RX bikes and Yamaha in general.

I'd be glad if someone can clear the following doubts I have about fuel efficiency for the RX100.

I'm sorry if you find it stupid when someone asks for a fuel efficient RX100, I know the bike isn't exactly commuter friendly compared to todays 4-strokes, but anyway, since I love riding the bike and this is the only bike I own, I'd like to get a somewhat decent kmpl (30-35 maybe?) so I doesn't not burn a huge hole in my pocket. And what do you know Petrol prices have risen again. :(

PS: I'm not cheap, thrifty maybe. (Russel Peters anyone? )

So back to the point.

Tyres:
How much do the kind of tyres affect the fuel efficiency.
Which tyre sizes from which brand are known to provide optimum fuel efficiency for the RX100?

The tyres on my bike are worn out and it seems the stock numbers are not easily available. Although if anyone can share information about where to procure them in Mumbai (preferably near Mulund) I would really appreciate that.
My mechanic told be it would cost around Rs. 3000 to get both changed.

Fuel Tank:
I would like to know what is the exact usable reserve tank capacity of the RX100 ('93 Model)
Are there any bad implications of running the bike on reserve for a long time?
I usually fill petrol in denominations of 50 or 100.
Should I be filling a greater amount of fuel and run it more through the main tank?
And what are the implications, if any of the above queries on fuel efficiency.

Iridium Spark Plugs, Performance Air filters:
Any implications (good or bad) on fuel efficiency.
I guess performance parts would generally decrease the kmpl, so can anyone shed some light on this and by how much do they affect the fuel efficiency.

RDD CDI Kit:
Also I would like to know about the RDD CDI kit in general and its implications on fuel efficiency. I did read through a few threads, and have a somewhat vague idea that it does wonders to your RX100.

I would be glad if someone in Mumbai (or anywhere) who has installed the kit can share their experience regarding bike performance before and after installation, cost of installing, procedure of getting it (in Mumbai), time frame it took for installation etc.

Any other general fuel efficiency tips for the RX100:
I'd really appreciate any useful tips that more experienced bikers have to share regarding fuel efficiency and the the Yamaha RX100.

About me and my bike:
Bought the RX100 around 4-5 months ago.
This is my first bike and the bike on which I learnt how to ride a motorcycle.
Restored it to stock condition and got all the RTO paperwork done, as the bike was not passed when I bought it. Except for the headache involved with the paperwork, I absolutely love owning and riding this legend. (Had to search for months before I could lay my hands on a decent one, and surely, it was worth the wait) As and when I get some decent shots of my bike, I'll upload them for sure.

Thanks in advance for your answers. Looking forward to reading them.
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Old 27th December 2010, 21:07   #10
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Default Re: The Yamaha RX100 : Optimizing fuel efficiency.

MY answers are in bold.

Quote:
Originally Posted by gauravRX View Post
I'm new here, and this is my first post in the Team-BHP forum. So here goes.

I've been owning an RX100 from around 4 months. I use it for casual trips around the suburbs and riding to college and back (approx. 45 km round trip)
Currently I'm getting around 22-25 kmpl (don't know how it ranks up)
My mechanic is Imtiaz in Bhandup (Mumbai) near Nirmal lifestyles.
Don't know if you have heard of him, but he does a good job with the RX bikes and Yamaha in general.

You should get around 35-45. thats what i used to get 35 used to be the worst with ripping real hard and around 45 in sane riding like 50-60 KMPH.

Tyres:
How much do the kind of tyres affect the fuel efficiency.
Which tyre sizes from which brand are known to provide optimum fuel efficiency for the RX100?

Just use any thing basic. because it would be nice and cheap to the pocket. i am using a basic Ceat in the front i will need to check the size. and for rear i am using the 3.00 /18 M45

The tyres on my bike are worn out and it seems the stock numbers are not easily available. Although if anyone can share information about where to procure them in Mumbai (preferably near Mulund) I would really appreciate that.
My mechanic told be it would cost around Rs. 3000 to get both changed.

This is what you can expect

Fuel Tank:
I would like to know what is the exact usable reserve tank capacity of the RX100 ('93 Model)
Are there any bad implications of running the bike on reserve for a long time?
I usually fill petrol in denominations of 50 or 100.
Should I be filling a greater amount of fuel and run it more through the main tank?
And what are the implications, if any of the above queries on fuel efficiency.

It has around 1 L of reserve and its better t get it filled up. i like doing to it the full so that i keep on running and i dnt have to shell money like every day. so it give me some days before i lose money again. hehehe and if your tank is not clean from inside like say rusted then just try to run in the mains rather than the reserve till the time to get it cleaned


Iridium Spark Plugs, Performance Air filters:
Any implications (good or bad) on fuel efficiency.
I guess performance parts would generally decrease the kmpl, so can anyone shed some light on this and by how much do they affect the fuel efficiency.

If it was me asking all these questions regarding the FE then i would not go for the Park plugs and Performance filters.

RDD CDI Kit:
Also I would like to know about the RDD CDI kit in general and its implications on fuel efficiency. I did read through a few threads, and have a somewhat vague idea that it does wonders to your RX100.

Beleive me your RX would not need the RDD kit. The original CDI or even the Swiss unit works fine.


I think this wuld be answering all your question
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Old 28th December 2010, 08:31   #11
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Default Re: The Yamaha RX100 : Optimizing fuel efficiency.

My answers in bold too

Quote:
Originally Posted by gauravRX View Post

Currently I'm getting around 22-25 kmpl

The best I got was 42kpl and the worst was 30kpl

But for 42 kpl, I did not go above 45 kph


to get a somewhat decent kmpl (30-35 maybe?)

That is what u can expect for a properly tuned bike. Ensure the following points are taken care of:

1. Carb Jets are stock (115 main and 20 idling)

2. Float pin and Jet Needle not damaged

3. Good quality air filter. Please try and source OE (Yellow) which is around Rs 300, but really good


Tyres:

Which tyre sizes from which brand are known to provide optimum fuel efficiency for the RX100?

Stock Tyre sizes on the RX100 are 2.50X18 front and 2.75X18 Rear. I would recommend 3.00X18 for the rear for better road grip

The tyres on my bike are worn out and it seems the stock numbers are not easily available. Although if anyone can share information about where to procure them in Mumbai (preferably near Mulund) I would really appreciate that.

More than Tyre condition, it is the inflation pressures involved that count. Check air pressure BEFORE your journey ... AFTER the trip, the heated up tyres will give you incorrect readings

Pressures for RX100 are:
Front 22 PSI and rear 28-32 PSI

Tyres are available rather easily for the RX100 ... Try Diamond Tyres in Chembur, near RK studio ... he has a good selection of tread patterns


My mechanic told be it would cost around Rs. 3000 to get both changed.

The estimate is correct

Fuel Tank:
I would like to know what is the exact usable reserve tank capacity of the RX100 ('93 Model)
10.5 ltrs capacity, 1 ltr reserve

Are there any bad implications of running the bike on reserve for a long time?
If u run the bike on reserve, the grime accumulated at the bottom of the tank will get into the carb and give you trouble

I usually fill petrol in denominations of 50 or 100.
Should I be filling a greater amount of fuel and run it more through the main tank?
And what are the implications, if any of the above queries on fuel efficiency.

Keep the fuel tank as full as possible. This displaces air from the tank and ensures that the evaporation losses are minimal and since there is less air in the tank, the condensation of atmospheric water is less ensuring that the tank does not corrode from the inside.
PS. ensure that u put in one 40 ml pouch of 2T oil in the tank whwn it is FULL to aid in the stopping of corrosion


Iridium Spark Plugs, Performance Air filters:
Any implications (good or bad) on fuel efficiency.
I guess performance parts would generally decrease the kmpl, so can anyone shed some light on this and by how much do they affect the fuel efficiency.

Stock works best

RDD CDI Kit:
Also I would like to know about the RDD CDI kit

No experience with this one ... although u are right about saying that performance mods will decrease FE

Any other general fuel efficiency tips for the RX100:

Ride in a controlled manner (I know that is difficult for an RX100 rider LOL)

One thing that I could recommend for FE is installing the 5-speed bike's 5th gear ONLY, not the entire gearbox

The top gear ratio in the RX100 is 23:23 ie 1:1

The RX135 5-speed 5th gear is 22:24 ie 0.91

It will cost around Rs 3.5 k for the conversion
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Old 28th December 2010, 09:38   #12
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Default Re: The Yamaha RX100 : Optimizing fuel efficiency.

I have a 86 Model and I get 30 kmpl under normal driving condition. Haven't driven it for some time now..I used to get about 40 a few years back though.

The things I check regularly is the engine oil and Air pressure.
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Old 28th December 2010, 10:01   #13
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Default Re: Increasing the fuel efficiency of a Yamaha RX100

There used to be a Yamaha RX100 specialist in Tardeo by the name of "Mubarak Auto". His most popular mod was adding on a 5th gear to the RX100 gearbox. Wouldn't that help while cruising? I do remember the Rx to have incredibly short gearing?
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Old 28th December 2010, 10:09   #14
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Default Re: Increasing the fuel efficiency of a Yamaha RX100

Keep the tuning at stock level. Ride spiritedly and enjoy the bike, but avoid ripping. That should return a FE of around 40 KMPL, which is pretty good. Don't tune it for mileage and make it lifeless. I kept my Shogun stock and it never returned more than 35 KMPL. But the ride and the howling exhaust note always brought a grin to my face.

These bikes are meant for riding pleasure and are not thrifty FE. If you want best FE figures get yourself a Splendor!

Last edited by Gansan : 28th December 2010 at 10:10.
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