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 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
www.neeraj.org.in/2010/05/tuning-yamaha-fz-16-carburetor.html 3/8
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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