10/26/13 Tuning Yamaha FZ 16 Carburetor

www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 1/8

T U E S D A Y , M A Y 2 5 , 2 0 1 0

Tuning Yamaha FZ 16 Carburetor

Note: Follow the below instructions at your own risk. However I

will be here to help if things go wrong.

Tool required: Screwdriver

Things to do before you tune yourbike.

1. Clean the air filter.2. Clean spark plug and make required adjustment.

The first thing you should know when it comes to tuning Yamaha

FZ 16 is understanding which jets control the fuel flow at a

particular throttle position.

Throttle positions:

Closed to 1/4th open: Fuel screw on the bottom of your carb

(Pilot Jet).

1/4 - 3/4: Needle Jet

1/2 - Full: Main Jet

Here we will discuss only about the Fuel Screw.

Where is the fuel screw in YamahaFZ 16?

In Mikuni Carburetor the fuel screw is close to the engine side on

the left. It a minus head in golden color.

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Tuning Yamaha FZ 16

Carburetor

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10/26/13 Tuning Yamaha FZ 16 Carburetor

www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 2/8

Before you touch the Fuel screw:

It’s important to note the current position of the fuel screw.

1. Turn off the engine.

2. Turn the fuel screw clockwise while you make a note of the

number of full turn it took to reach the close position (Turn the

fuel screw clockwise till it closes).

3. Now put the fuel screw back to the default position (Turn it

anti-clockwise)

How to adjust fuel screw?

Turning the Fuel screw clockwise will reduce fuel flow: Lean

mixture.

Turning the Fuel screw anti-clockwise will add more fuel: Rick

mixture.

Let’s get started:

1. We need to warm up the engine. Not just starting the

engine;Ride your bike for 10 to 15 minutes.

2. Bring the bike to fast idle (Turn the idle screw clockwise till

the RPM hits 2000)

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10/26/13 Tuning Yamaha FZ 16 Carburetor

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3. Now use the screwdriver to slowly turn the fuel screwclockwise

till the engine RPM drops. Note some bike will still run when the

fuel screw is completely tight.

Now the bike is running at the leanest point.

4. Now slowly turn the fuel screw anti-clockwise 1/2 turn at a

time (180 degree or half turn)

Wait and listen to the engine RPM and continue turning anti-

clockwise 1/2 turn at a time.

You will hear the engine rpm begin to speed up.

Stop turning the fuel screw at the point when the engine hits peak

rpm (At this point the exhaust note will be crisp).

Peak rpm is when the engine runs the cleanest and fastest.

When you reach that point, turning the fuel screw anti-clockwise

won't increase the rpm further.

Note: Turning the fuel screw anti-clockwise further from the

above point, the rpm will stay up but the exhaust note will

become dull.

5. Now turn the idle screw anti-clockwise to bring the rpm back

to 1000 or 1500.

6. Now take a test ride.

Did I get the correct Air/Fuelmixture?

1. Twist the throttle the response should be quick and crisp.

2. There should be no hiccups when you ride.

What fuel economy can I expect onYamaha FZ 16?

40+ Km/lt if speed below 55kmph.

35 to 40 km/lt if speed is 60 to 80kmph

My Bike Photo 1

My Bike Photo 2 POSTED BY SRINIV ASAN L AT 8:56 PM

LABELS: CARBURETOR TUNING, CHENNAI , INDIA, YAM AHA FZ 16

CARBURETOR TUNING, YAM AHA FZ 16 M ILEAGE

REACTIONS:

2 9 C O M M E N T S :

10/26/13 Tuning Yamaha FZ 16 Carburetor

www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 4/8

Anonymous May 26, 2010 at 7:14 PM

Very Usefull

Reply

Anonymous June 19, 2010 at 7:07 PM

My bike runs great now...Thanks :)

Reply

kmashraf October 21, 2010 at 10:37 AM

I am gonna try out your tuning instructions. I need to know if

rear disc brakes can be retrofitted to the FZ16?

Reply

avik mahato November 18, 2010 at 7:47 PM

This comment has been removed by the author.

Reply

avik mahato November 18, 2010 at 7:49 PM

gr8 article...

can you guide me how to tune my FZ-16 carb in high altitude?

will reducing the fuel (i.e, making it lean) will do by clock

wise movement of the fuel screw?

can it be done in trial & error method only by seeing the

performance & compression i am getting from the bike?

Reply

Anonymous March 7, 2011 at 1:41 PM

thks

Reply

dibya May 29, 2011 at 9:21 PM

hi,i hav hailed into a problem.today when i checked, my fuel

screw has jammed and i can hardly move it form its postion

..do u hav any idea regarding thi???:( can u plz help me out

Reply

Anonymous November 10, 2011 at 6:33 PM

For Starters: Simplest way to adjust airscrew for optimal

pickup and milage

1.Note down / mark the correct position of the airscrew.

2.Turn airscrew two full rounds anti-clock wise

3. Set the rpm to 1500

4. wait for 15 seconds and apply little throttle. if the bike

10/26/13 Tuning Yamaha FZ 16 Carburetor

www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 5/8

stops then tighten the airscrew 1/4 (quarter circle).

5. Repeat point 4 until your bike is stable.

I am getting 50 milage on my FZ

Reply

Anonymous November 12, 2011 at 9:28 AM

how many turns from close is the default A/F settings of FZ ?

Reply

Anonymous December 8, 2011 at 8:01 AM

where's the air screw in FZ carb?

Reply

Anonymous December 10, 2011 at 12:00 PM

3. "Now use the screwdriver to slowly turn the fuel screw

clockwise till the engine RPM drops. Note some bike will still

run when the fuel screw is completely tight."

Question:

1: RPM drop to 1000? Or

2: turn the fuel screw clock till its totally close tight?

Reply

Anonymous January 10, 2012 at 5:13 PM

wht is the default number of turns of fuel screw in yamaha

fz16

Reply

Srinivasan L January 12, 2012 at 5:40 PM

It depends on climatic conditions...Default may be between

2.5 to 3.5 Full rotation.

Reply

Anonymous January 29, 2012 at 4:16 PM

Why does mine turning clockwise towards closing will inc the

rpm instead? And anti clockwise dropping the rpm? It's totally

opposite from the guide. Help please.

Reply

nshant May 13, 2012 at 8:29 PM

my fz emit smoke,only 10,000 km completed

Reply

makaranda June 9, 2012 at 2:53 AM

10/26/13 Tuning Yamaha FZ 16 Carburetor

www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 6/8

thnks!

Reply

Anonymous July 8, 2012 at 12:24 PM

R u sure i will get 40+ milage. What will happen if the fuel

screw tight (clockwise). Will it increase milage..

Reply

Anonymous August 16, 2012 at 10:31 PM

i did not counted the turns of fuel screw while rotating

clockwise ! and should not we touch air screw ?

presently fuel screw is 1 turn open from full tight, what will

be the mileage or performance? ...

Reply

Shrijan August 23, 2012 at 2:49 PM

Will it not effect the pick up or acceleration of the bike ??

Reply

Anonymous August 26, 2012 at 4:16 PM

my fz is giving me 55kmpl even before tuning in city...

Reply

Sai krishna September 30, 2012 at 11:00 AM

one doubt. wats that screw on bottom. is that related to

overflow . .

Reply

Srinivasan L October 9, 2012 at 5:25 PM

Yes thats the drain out the fuel.

Reply

Gob Thurai January 8, 2013 at 7:39 AM

I have fz16, done 20000km, i am facing problem that, when i

reduce the speed, getting trouble like, eng gets off or even

on stared position no rpm goes up.....Local mechanics says,

Reply

Gob Thurai January 8, 2013 at 7:42 AM

even mechanics also confused, because they have tried

several ways and open carb more than 7 times, but

nothing....and also one time they have put small cable in to

main jet to reduce fuel then works well but low engine

power....so what can I do??/

10/26/13 Tuning Yamaha FZ 16 Carburetor

www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 7/8

Replies

Reply

Reply

Rishis3D March 26, 2013 at 11:09 PM

hi Gob Thurai .. i have the same problem in my

bike also..did u find any solution ?

sap January 19, 2013 at 12:54 AM

thanks this was very helpful. i tried this, but i tried after

installing a k&n , i tuned to 3000 rpm n did as suggested by

xbhp, but a funny thing i found out that i had to screw 4 half

rev to get the optimal mix, at first in 5 half rev the rpm got

constant then i drove for a test ride, then again i screwed 1

half more rev so as to match xbhps suggestion (mentioned 3-

4 ful rev) but after 3 ,4 iteration at last i got it in 4 half rev,

but i heard the stock rev is 5, so its kinda fishy to me that is

it really safe for me to drive with 4 half rev, since it can heat

up the engine ??? plz guys i need some advice in this !!!!!

Reply

Rishis3D March 26, 2013 at 11:08 PM

hi Gob Thurai .. i have the same problem in my bike

also..did u find any solution ?

Reply

sivaram March 27, 2013 at 2:22 PM

Gob Thurai and Rishis3D:

From what u said, I understand that you are running on Rich

mixture.

1. Go to a trusted mechanic or yamaha service center and

ask them to tune the carburetor to "stock"/original setting.

2. Set the engine idle speed to 1300-1500rpm.

3. Check your Air Filter for any dust or spoilage.

4. Check clutch free play and also Throttle(accelerator) free

play.

5. Before you start your bike for the first time in a day, set

the choke lever to "ON" and wait for 20 seconds. Then start

riding.

After all these if you do not find any change, then there may

be a bigger fault. Contact Yamaha Dealer

Reply

Manu g August 13, 2013 at 7:55 PM

i tried this... but i fully tight the air/fuel mixer screw the

engine still running... any idea? so i guess i need to change

the needle ? right?

10/26/13 Tuning Yamaha FZ 16 Carburetor

www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 8/8

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