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**snehith** · 07-23-2014, 01:01 AM

Re: Yamaha FZ-16/ FZ-S

Originally posted by arijitmaniac View Post

Throttle getting stuck is a sign that either the throttle cable is rusted inside or the return spring has gone kaput... Get it checked ASAP. You risk a major accident. Why wait for it?

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Hey I've got it checked. There was lot of dirt that was making the cable movement not soo free

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Will replacing my stock rear tyre to 140/70 affect the mileage??

**Ishwor** · 07-23-2014, 06:46 AM

Re: Yamaha FZ-16/ FZ-S

Originally posted by sachin_v View Post

[ATTACH=CONFIG]151590[/ATTACH]
While cleaning the bike noticed that this pipe had come off. The bike behaved strange since past 100-150 kms like felt sluggish and was going off often. Was this the culprit? After fixing it back it feels better, but riding in this condition for 100 odd kms would have caused any harm to the engine?

I guess its the air intake hose, and the engine would have inhaled unfiltered air, correct me if i'm wrong. Anything to worry?

This is a pipe from Air Induction system.The function of AIS is to inject additional air on exhaust to burn unburnt fuel.So it does not cause lean or eich mixture since it doesnot inject air to combustion chamber.

Sent from my Samsung Galaxy s3

**SparKot** · 07-23-2014, 08:28 AM

Re: Yamaha FZ-16/ FZ-S

Originally posted by Ishwor View Post

This is a pipe from Air Induction system.The function of AIS is to inject additional air on exhaust to burn unburnt fuel.So it does not cause lean or eich mixture since it doesnot inject air to combustion chamber.

That's not AIS(Air-Induction-System) tube for exhaust, refer to page 6-9 on service manual for detailed AIS components.

Refer to page 3-12 on service manual; it's called "Breather Tube Head" & I don't know how it works.

I've heard of crankcase breather tube, it comes in the back. It's supposed to vent out blow-by & hot-oil fumes out of crankcase.

**accuengineer** · 07-23-2014, 10:59 AM

Re: Yamaha FZ-16/ FZ-S

Originally posted by SparKot View Post

That's not AIS(Air-Induction-System) tube for exhaust, refer to page 6-9 on service manual for detailed AIS components.

Refer to page 3-12 on service manual; it's called "Breather Tube Head" & I don't know how it works.

I've heard of crankcase breather tube, it comes in the back. It's supposed to vent out blow-by & hot-oil fumes out of crankcase.

Your are right it is not part of the AIS. Like said it is the breathing Tube. The main purpose of this is to vent out excess air pressure inside the head. This tube ends below the air filter. Small amount of oil is also mixed in the air leading to oil deposition inside the air filter box. If this tube is removed dust and debris can enter the engine top leading to jamming of valves. Better take your bike to a good SVC and tell them to clean the head. The damage may be minimum as it ran only for few 100 kms.

Cheers

Mathews

**Ishwor** · 07-23-2014, 12:37 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by SparKot View Post

That's not AIS(Air-Induction-System) tube for exhaust, refer to page 6-9 on service manual for detailed AIS components.

Refer to page 3-12 on service manual; it's called "Breather Tube Head" & I don't know how it works.

I've heard of crankcase breather tube, it comes in the back. It's supposed to vent out blow-by & hot-oil fumes out of crankcase.

Sorry my mistake.
Actually I have worked on AIS since I had problem with it.Still running with bypassed AIS

.

It looks similar to that of pipe from AIS so immediately assumed it.

Sent from my Samsung Galaxy s3

**SparKot** · 07-23-2014, 02:22 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by accuengineer View Post

Your are right it is not part of the AIS. Like said it is the breathing Tube. The main purpose of this is to vent out excess air pressure inside the head. This tube ends below the air filter. Small amount of oil is also mixed in the air leading to oil deposition inside the air filter box.
...

So, these fumes are mixed with filtered-air inside air-filter box for efficient burning of fuel(& engine-oil) fumes. GS150R has it in the rear of crankcase closer to air-filter box.

Collecting fumes near the head seems to be optimal (or not). These fumes are subjected to vacuum suction from engine during intake, right?

**accuengineer** · 07-23-2014, 04:03 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by SparKot View Post

So, these fumes are mixed with filtered-air inside air-filter box for efficient burning of fuel(& engine-oil) fumes. GS150R has it in the rear of crankcase closer to air-filter box.

Collecting fumes near the head seems to be optimal (or not). These fumes are subjected to vacuum suction from engine during intake, right?

Actually the oil mist or fumes are not the main criteria for the breathing tube. The main purpose of the breathing tube is to prevent the air pressure being built up in the head area. If more pressure is built up sensitive parts like seal or rubber parts can get damaged leading to engine failure. And the reason for not just putting the pipe and exhausting it into the atmosphere is that the dirt and debris can enter when the engine is not running. Hence they have directed it to the air filter box. Moreover the air coming in will be warm/hot which will also assist in better combustion.

Cheers

Mathews

**SparKot** · 07-23-2014, 04:46 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by accuengineer View Post

Actually the oil mist or fumes are not the main criteria for the breathing tube. The main purpose of the breathing tube is to prevent the air pressure being built up in the head area. If more pressure is built up sensitive parts like seal or rubber parts can get damaged leading to engine failure. And the reason for not just putting the pipe and exhausting it into the atmosphere is that the dirt and debris can enter when the engine is not running. Hence they have directed it to the air filter box. Moreover the air coming in will be warm/hot which will also assist in better combustion...

I agree with the pressure build up & causing leaking seal eventually engine failure.

I disagree on the hot-air point though. Hot air is less denser, that's why we hear about cold-intake a lot. Cold(or even ambient/outside temp) intake plays a major role in cooling off the cumbustion chamber; leaving piston's underbelly as the most hot area in the engine. Which is then addressed by jet of engine-oil directed towards the piston-belly(in most engines).

Breather-Pipe:
As we think about piston motion, about 153cc of air is displaced from crankcase into air-filter box during power & intake strokes; and during compression & exhaust strokes about same amount is taken into crankcase from air-filter box. Interesting thing is during power-stroke, both intake & exhaust values are closed & hence air is pushed out of air-filter in reverse order (not necessarily complete 153cc).

Just my guessing ... @Ishwor what do you think?

PS: I'm bored...

**nadz11.ns** · 07-23-2014, 05:01 PM

Originally posted by SparKot View Post

Interesting thing is during power-stroke, both intake & exhaust values are closed & hence air is pushed out of air-filter in reverse order (not necessarily complete 153cc)

This statement isn't correct.
During power stroke, both the valves are closed and there isn't any force to push the air in reverse through the air filter.

**nadz11.ns** · 07-23-2014, 05:29 PM

Re: Yamaha FZ-16/ FZ-S

One more query, would it cause any harm to the chain if i apply grease meant for industrial use ?

I had cleaned and lube the chain last evening but had to ride today morning in heavy rain for nearly 2 hours. The chain started making weird noise and upon inspection saw the lube had washed off and it was having metal to metal contact. Don't have any oil or lube at present.

**arijitmaniac** · 07-23-2014, 05:46 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by SparKot View Post

I agree with the pressure build up & causing leaking seal eventually engine failure.

I disagree on the hot-air point though. Hot air is less denser, that's why we hear about cold-intake a lot. Cold(or even ambient/outside temp) intake plays a major role in cooling off the cumbustion chamber; leaving piston's underbelly as the most hot area in the engine. Which is then addressed by jet of engine-oil directed towards the piston-belly(in most engines).

Agree on the cold air part. That's the reason we have intercoolers in turbocharged engines. The intercooler cools the charge-air (compressed air coming out of the turbocharger) before its injected into the cylinders.

Originally posted by SparKot View Post

Breather-Pipe:
As we think about piston motion, about 153cc of air is displaced from crankcase into air-filter box during power & intake strokes; and during compression & exhaust strokes about same amount is taken into crankcase from air-filter box. Interesting thing is during power-stroke, both intake & exhaust values are closed & hence air is pushed out of air-filter in reverse order (not necessarily complete 153cc).

Just my guessing ... @Ishwor what do you think?

PS: I'm bored...

Air is never pushed out during the power-stroke. The air stays inside the combustion chamber and is compressed by the piston. This high-pressure air-fuel mixture on ignition generates the force to push the piston down.

If the air were to be pushed out then the pressure would be very less and therefore the air-fuel mixture would not have enough energy to push the piston down for the next stroke. In other words the engine would stop.

It is to maintain this compression that we replace the piston-rings, valve-seats, valves, head gasket etc when they are worn out. Hope it makes sense.

Originally posted by nadz11.ns View Post

One more query, would it cause any harm to the chain if i apply grease meant for industrial use ?

I had cleaned and lube the chain last evening but had to ride today morning in heavy rain for nearly 2 hours. The chain started making weird noise and upon inspection saw the lube had washed off and it was having metal to metal contact. Don't have any oil or lube at present.

I guess grease is too thick for application on chain. Instead you can use a heavy oil like gear oil (EP-90 or something).
Heard that it makes a mess (flinging around and thus sticking to the rims, swingarm, tyre hugger, cahin cover etc.) but it will do the job in rains. And anyway the monsoons make a mess of our bikes. You can clean it afterwards.

Cheers!

**nadz11.ns** · 07-23-2014, 05:50 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by arijitmaniac View Post

I guess grease is too thick for application on chain. Instead you can use a heavy oil like gear oil (EP-90 or something).
Heard that it makes a mess (flinging around and thus sticking to the rims, swingarm, tyre hugger, cahin cover etc.) but it will do the job in rains. And anyway the monsoons make a mess of our bikes. You can clean it afterwards.
Cheers!

As i thought, it would be too thick to use.
I do use gear oil, but don't have any with me at present. Would have to get more.
Thanks anyways.

**devils_friend** · 07-23-2014, 05:57 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by nadz11.ns View Post

One more query, would it cause any harm to the chain if i apply grease meant for industrial use ?

I had cleaned and lube the chain last evening but had to ride today morning in heavy rain for nearly 2 hours. The chain started making weird noise and upon inspection saw the lube had washed off and it was having metal to metal contact. Don't have any oil or lube at present.

Since our bike has open chain, applying grease will attract more dirt and the chain will be in a mess. If you cannot get Gear Oil, then get machine oil from local shop and use that for time being.

Cheerz!!

**kusmaker** · 07-23-2014, 06:23 PM

Re: Yamaha FZ-16/ FZ-S

Originally posted by devils_friend View Post

Since our bike has open chain, applying grease will attract more dirt and the chain will be in a mess. If you cannot get Gear Oil, then get machine oil from local shop and use that for time being.

Cheerz!!

Instead of machine oil i would advice any engine oil or 2t oil for lubrication till you purchase gear oil, or chain lube for O-ring chains, although O-ring chains dosen't need lubrication, they only need cleaning and slight lubing of oil seals so that they don't get hard and starts cracking.

**bilalans** · 07-23-2014, 06:36 PM

Re: Yamaha FZ-16/ FZ-S

Hello guys!

Has anybody replaced the swingarms on Fz. I want to know the cost. Thanx

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