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**Balgi** · 11-19-2014, 10:54 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by Ishwor View Post

Ohh..please dont make fun of me

These monkeys behave as if they are engineers
And arenot ready to take any advice from us.

Sent from my Samsung Galaxy s3

So don't advise them. Just order them because that is your right.
They are beneath you because you are the customer, You're not beneath them bro.
Show those monkeys who's boss.

**Ishwor** · 11-20-2014, 03:10 PM

Re: Yamaha FZ-16/ FZ-S

Have anyone done float height adjustment on the carburator?
My bike jerking when accelerating at low rpm may be related to this issue.

Sent from my Samsung Galaxy s3

**accuengineer** · 11-20-2014, 03:12 PM

Re: Yamaha FZ-16/ FZ-S

Guys my display console is having problem. In the Speedometer, the 3rd digit alone is not working (i.e) "100*. Is it serviceable. Please advise.

Cheers

Mathews

**devils_friend** · 11-20-2014, 05:53 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by Ishwor View Post

Have anyone done float height adjustment on the carburator?
My bike jerking when accelerating at low rpm may be related to this issue.

Sent from my Samsung Galaxy s3

I also face the same issue when I try to maintain a constant speed. The bike feels as if it is about to hit reserve, irrespective of the amount of fuel in the fuel tank.

Haven't opened the carb till date. But, had got the carb cleaned last year.

Cheerz!!

Originally posted by accuengineer View Post

Guys my display console is having problem. In the Speedometer, the 3rd digit alone is not working (i.e) "100*. Is it serviceable. Please advise.

Cheers

Mathews

Mostly the display has gone bad. The only option is to open and check if the circuit can be repaired or not.

Although, LCD displays aren't that easy to be repaired.

Cheerz!!

**Ishwor** · 11-20-2014, 09:01 PM

Fz 16 carburator problem

My fz16 has done 73 k kms and running on stock engine.
I am facing carburator problem.Bike does fine at high rpm/speed but when riding inside city at low speed and low gears bike struggles.

After changing gear and accelerating bike jerks.Bike lose power for a moment and jerks bad.

Carburator cleaning,new spark plug,new air filter didnt help.Mechanic says this symptom has accoured on almost all first gen fz(fz16) and carburator needs replacement.

Carburator costs almost 9k indian rupees here in Nepal.Is there any cost effective option?

Mechanic says this new carburator of fz s increases mileage.

Can anyone enquire the cost of the carburator of FZ S?

Sent from my Samsung Galaxy s3

**nadz11.ns** · 11-20-2014, 11:14 PM

Re: Yamaha FZ-16/ FZ-S

At higher altitudes due to low air pressure, our carbureted bikes feel powerloss and hence struggle in their ride. One remedy is to lower the fuel spray to have proper combustion (wire in carburetor trick).
So what if we increase the air intake itself without altering the fuel ? Like by using air filter which would allow more air to pass. Would it help the same way ?

**SparKot** · 11-20-2014, 11:29 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by nadz11.ns View Post

...
So what if we increase the air intake itself without altering the fuel ? Like by using air filter which would allow more air to pass. Would it help the same way ?

If I recollect correctly, air-filters offer insignificant resistance to air-flow.

And I think Oxygen is lighter than Nitrogen hence the oxygen concentration(by ratio) decreases by increase in altitude. That's a wrong assumption; Percentage of oxygen in air, at 21%, remains almost unchanged up to 21,000 metres (69,000 ft); defined by the similar molecular RMS velocities.

Since the air intake is naturally aspirated, 1L of air at sea level will have more oxygen molecules when compared to 1L of air at higher altitude.

You can remove the air-filter if you like, almost zero air-pollution at places like Himalayas.

**nadz11.ns** · 11-20-2014, 11:30 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by SparKot View Post

If I recollect correctly, air-filters doesn't offer any significant resistance for air-flow.

Still they do. Use any after-market air filter and the same AFR would be much leaner as compared to that of stock paper type air filter.

And ya, oxygen percentage is much lower at high altitudes and this is the primary reason for powerloss in bikes as the AFR becomes too rich and causes improper combustion which in turn leads to loss of power produced.
That's why i asked if we can increase the air intake, would this problem be solved.

**nadz11.ns** · 11-20-2014, 11:47 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by SparKot View Post

You can remove the air-filter if you like, almost zero air-pollution at places like Himalayas.

Well, can't do so. The roads are very dusty in hilly areas and a 'zero-pollution' zone is nowhere to be found.

**SparKot** · 11-21-2014, 12:19 AM

Re: Yamaha FZ-16/ FZ-S

I guess one can force feed the air to match the atmospheric pressure at sea level, but that'll be expensive.

But, I still don't understand how low density air pull fuel up the jets/capillaries enough to make AFR rich.

**nadz11.ns** · 11-21-2014, 12:24 AM

Re: Yamaha FZ-16/ FZ-S

Originally posted by SparKot View Post

But, I still don't understand how low density air pull fuel up the jets/capillaries enough to make AFR rich.

Its not like this.
See, since the air is leaner at higher altitudes, the air sucked is lean in oxygen. But the fuel supplied remains same. This cause the AFR to become lean. There is no way more fuel is pushed through the jets.

**devils_friend** · 11-21-2014, 11:51 AM

Re: Yamaha FZ-16/ FZ-S

Originally posted by nadz11.ns View Post

At higher altitudes due to low air pressure, our carbureted bikes feel powerloss and hence struggle in their ride. One remedy is to lower the fuel spray to have proper combustion (wire in carburetor trick).
So what if we increase the air intake itself without altering the fuel ? Like by using air filter which would allow more air to pass. Would it help the same way ?

If air supplied will be more, the bike will have lean AFR. IMO, tune the carb towards richer side. Those who have done Ladakh on FZ have faced the same issue and they had to tune their bikes to richer AFR. Tuning had helped them.

Cheerz!!

**nadz11.ns** · 11-21-2014, 12:05 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by devils_friend View Post

If air supplied will be more, the bike will have lean AFR. IMO, tune the carb towards richer side. Those who have done Ladakh on FZ have faced the same issue and they had to tune their bikes to richer AFR. Tuning had helped them.

Cheerz!!

No, its the other way around. They lean their AFR. Or atleast i got to understand that much.
The afr which us perfect in plain will automatically get rich at higher altitudes. (Am i wrong here, please correct if so)
Yea, tuning at that particular place helps. I was just looking for more options.

**accuengineer** · 11-21-2014, 12:05 PM

Re: Yamaha FZ-16/ FZ-S

Please correct me if I am wrong. In high altitude the oxygen available is less so we have less oxygen to assist proper combustion. But the fuel supplied is the same. So the AFR will become rich with more fuel and less Oxygen. So a wire in the fuel intake will reduce the fuel ratio, thereby normalising the AFR. So if we make the setting to lean(fuel intake) then the problem will be solved.

Cheers

Mathews

**devils_friend** · 11-21-2014, 01:11 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by Ishwor View Post

My fz16 has done 73 k kms and running on stock engine.
I am facing carburator problem.Bike does fine at high rpm/speed but when riding inside city at low speed and low gears bike struggles.

After changing gear and accelerating bike jerks.Bike lose power for a moment and jerks bad.

Carburator cleaning,new spark plug,new air filter didnt help.Mechanic says this symptom has accoured on almost all first gen fz(fz16) and carburator needs replacement.

Carburator costs almost 9k indian rupees here in Nepal.Is there any cost effective option?

Mechanic says this new carburator of fz s increases mileage.

Can anyone enquire the cost of the carburator of FZ S?

Sent from my Samsung Galaxy s3

Dismantle the Carb and check for any damage within carb. There can be possibility of some parts can be replaced and the carb will be back to it's glory.

Price here in India is Rs. 3500 or so.

Cheerz!!

Originally posted by nadz11.ns View Post

No, its the other way around. They lean their AFR. Or atleast i got to understand that much.
The afr which us perfect in plain will automatically get rich at higher altitudes. (Am i wrong here, please correct if so)
Yea, tuning at that particular place helps. I was just looking for more options.

True that. But, you have to tune the carb, so that the bike runs fine at higher altitudes.

Making the bike run on lean mixture will put more stress on the engine. Not sure why they make it run on lean AFR

Cheerz!!

Originally posted by accuengineer View Post

Please correct me if I am wrong. In high altitude the oxygen available is less so we have less oxygen to assist proper combustion. But the fuel supplied is the same. So the AFR will become rich with more fuel and less Oxygen. So a wire in the fuel intake will reduce the fuel ratio, thereby normalising the AFR. So if we make the setting to lean(fuel intake) then the problem will be solved.

Cheers

Mathews

Lean AFR will put more stress on the engine. Already the bike struggles at higher altitude and if we make it more lean (more air + less fuel) the bike will overheat and stall.

Cheerz!!

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