Valve Clearance

[Constructicon]

Hi people,

 

I want to ask what exactly is valve clearance?

Made a call to my bike shop , and the boss says to do it at ard 75000km.

Its quite a diff from the owners manual though, which states ard 45K.

 

Any advice?

btw, I am riding a fazer 1k, carb model.

 

Thanks.

:)

[kaozie]

valve clearance is refering to the clearance between the cam and the tip of the valve stem. this clearance is to allow for the expansion of the intake and exhuast valve when the engine is hot, to allow proper seating of the valves.

 

the wear on the cam(if you maintain your bike regularly) is minimum. not necessary unless you got a loss of power.

[Constructicon]

valve clearance is refering to the clearance between the cam and the tip of the valve stem. this clearance is to allow for the expansion of the intake and exhuast valve when the engine is hot, to allow proper seating of the valves.

 

the wear on the cam(if you maintain your bike regularly) is minimum. not necessary unless you got a loss of power.

 

Thanks for the reply bro!

[GuiNNeSS]

valve clearance is refering to the clearance between the cam and the tip of the valve stem. this clearance is to allow for the expansion of the intake and exhuast valve when the engine is hot, to allow proper seating of the valves.

 

the wear on the cam(if you maintain your bike regularly) is minimum. not necessary unless you got a loss of power.

 

When you have loss of power, probably its too late already.

 

As the valve wears out the valve seat, the valve cleareance becomes less and less, until it comes to a point where the valve does not seat into the valve seat. This is very important because the valve has to transfer off heat or it will burn out. A burnt out valve = $$$$$ to fix.

 

On the other hand, if there is too much valve cleareance, there will be a ticking noise, and you'll wear out the valvetrain prematurely. $$$ to fix again.

[kish_garfield]

does it mean all ticking sound is due to vlave?

[pixeLFreak]

does it mean all ticking sound is due to vlave?

 

 

no..sometime, it comes from a working fuel pump..

 

and also from a wear/loose connecting rod..

[kaozie]

When you have loss of power, probably its too late already.

 

As the valve wears out the valve seat, the valve cleareance becomes less and less, until it comes to a point where the valve does not seat into the valve seat. This is very important because the valve has to transfer off heat or it will burn out. A burnt out valve = $$$$$ to fix.

 

On the other hand, if there is too much valve cleareance, there will be a ticking noise, and you'll wear out the valvetrain prematurely. $$$ to fix again.

 

eermmm... i only hear of valve clearance gets bigger and not smaller...

[slowcoach]

eermmm... i only hear of valve clearance gets bigger and not smaller...

 

It can get big or get small. When the seat gets worn away, the valve will sink deeper. So the clearance gets closed up. ITS MUCH MORE DANGEROUS then having too much clearance. Which mostly creates a power-loss due to the reduce valve actuation.

[Phang]

Valve clearance will become smaller when the valve seat wears out, also exhaust valve stem will grow longer with use due to the thermal stress and this will close up the gap and made the valve clearance smaller.

[Demon]

When the seat gets worn away, the valve will sink deeper. So the clearance gets closed up. ITS MUCH MORE DANGEROUS then having too much clearance.

 

Shouldn't it be that it is safer for the clearance be a little on the loose side than too tight or with no clearance at all.

 

[ulysses_sc]

It can get big or get small. When the seat gets worn away, the valve will sink deeper. So the clearance gets closed up. ITS MUCH MORE DANGEROUS then having too much clearance. Which mostly creates a power-loss due to the reduce valve actuation.

 

I tend to disagree. Too tight clearances is worse than too much clearance, as an improperly closed valve will not be able to dissipate heat to the cylinder head, and consequently may burn the valve.

[WildCard]

does it mean all ticking sound is due to vlave?

 

Nope.

You used ride a TLR, right?

Ever realized, especially at cold starts but also most of the time, the engine ticks rather loudly.

So much so, a fren mistook it for a valve problem.

 

Some bikes have rather loud injectors that sounds almost the same as a valve with wrong clearance.

 

Hi people,

 

I want to ask what exactly is valve clearance?

Made a call to my bike shop , and the boss says to do it at ard 75000km.

Its quite a diff from the owners manual though, which states ard 45K.

 

Any advice?

btw, I am riding a fazer 1k, carb model.

 

Thanks.

:)

 

This is the weird part.

All mechs, including the agent for my bike, also said 70000+ km before a valve job.

Yet the manual recommends ard 30+ to 40+ thousand km.

 

In the end, I elected to do one at just before 40000km, within the manual's recommendation.

Next one will be at 70000 km.

 

Being something that cannot be seen clearly and which symptoms can be mistaken for another part (loud injectors), I feel its best to follow the manual.

Can't go wrong.

Its extra money, no doubt. But money best spent to make sure you get the longest life possible out of the bike (barring other problems).

[dinie]

well sometimes the ticking sound can be the cam chain tensioner as well..

[DGray]

Couldn't agree less with Wildcard. Its better to follow ur manual. Manufacturers knows wats best for the bike.

[slowcoach]

I tend to disagree. Too tight clearances is worse than too much clearance, as an improperly closed valve will not be able to dissipate heat to the cylinder head, and consequently may burn the valve.

 

ERm. You need to re-read my post. I said '....So the clearance gets closed up. ITS MUCH MORE DANGEROUS then having too much clearance...'. Thanks

[slowcoach]

Shouldn't it be that it is safer for the clearance be a little on the loose side than too tight or with no clearance at all.

 

 

Bingo.

[GuiNNeSS]

Couldn't agree less with Wildcard. Its better to follow ur manual. Manufacturers knows wats best for the bike.

 

Well, you can choose to stick to the recommended maintenance intervals stated in the manual, or change it to suit your riding style.

 

For me, I ride my bike hard, so I checked my valve clearances at 24,000kms instead of the recommended 42000kms. Two valves were alittle on the tight side, the rest were spot on.

[ulysses_sc]

ERm. You need to re-read my post. I said '....So the clearance gets closed up. ITS MUCH MORE DANGEROUS then having too much clearance...'. Thanks

 

Kekeke me eyes are not what they used to be.

[Arwan]

So guys...any mechs to be named or bikeshops to recommend that does good valve clearance???

 

How much money estimated that need to put aside for this valve clearance servicing btw?

[Marcheline]

I just did valve clearance at Planet Motors. Feeling afterwards is really priceless. Bike feels very light and responsive. I did it together with a head gasket change for $180. S4 btw..

[Hazmat_83]

A noob question,

 

Do all bikes have valves? And how do I identify whether a bike has valves or not?

[ulysses_sc]

A noob question,

 

Do all bikes have valves? And how do I identify whether a bike has valves or not?

 

Only 4 stroke bikes have valves and cams. 2 strokes do not.

 

Do a google if you do not know the difference between a 2 and 4 stroke engine.

[Demon]

Only 4 stroke bikes have valves and cams.

 

Not if it's a rotary engine

 

http://www.suzukicycles.org/RE5/RE5-Rotary.shtml

[Phang]

2 stroke engines also got valve, reed valve, rotary valve, RC Valve, YPVS (Yamaha Power Valve System), KIPS (Kawasaki Integrated Powervalve System) but no poppet valve:cool:

[ulysses_sc]

Not if it's a rotary engine

 

http://www.suzukicycles.org/RE5/RE5-Rotary.shtml

 

Ha ha ok. I'll rephrase it to "all non-rotary 4 stroke bikes have valves and cams"