servicing question

[mirax]

what symptons do you experience if the value clearances need doing? as my bike makes a ticking noise and im not sure if its the shims making the noise or something else

[mr.z]

Tend to get louder as the bike warms up (parts expand, clearances become bigger)

Camchain will (*apparently) be noisier as the bike is cold and faids a bit as the bike warms up (on imne the oil chain does the same)

Main symptom is less efficient runing, but not allways immediately obvious unless they are very far out (bearing in mind they go out over time so you'll not notice it untill you fix it)


What bike is it? The checking could be a 30minute or several hour job depending (anything with shims is going to be a pain unless you happen to have a big stack of every size..)


*as far as i remember, not had it happen myself)
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>RidingSkills<->Tech Tips<->MyBikes<

[Simple]

[mr.z]

Thats why you ALLWAYS do valve clearances from cold, if you do them when its warmed they will be way too tight once the bike becomes cold and you start up the bike again (major problems)

So clearances (i.e. the gap) are biger when the bikes at operateing temp
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>RidingSkills<->Tech Tips<->MyBikes<

[Simple]

I though you did them at cold because its a set way of doing it, not everyone can heat their bike to 80degrees then open it up and play with the metal bits.

metal will be same size as it should be , unexpanded when it's cold.
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Insta - FemFeral

[Nath]

The purpose of clearance between the valve and the tappet is to account of the expansion of the metal. When the engine is cold there is a small gap, so the rocker arms will be likely to rattle around. But as the engine gets hot the metal expands closing up the gap which means no rattling.

If the clearance is too great then there the rockers arms will still bang about even when the engine is at maximum operating temperature, and the valves will not open for as long as they should do.

If the clearance is too small then the valves will not be able to close fully when the engine is hot.


So to answer the original question: If there is a 'ticking' sound coming from the head when the engine is hot, then the valve clearances could be too slack. However if your bike uses shimmed valve clearances then this is perhaps not the case.
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Hard livin', hard luck.

[mirax]

so what perfomance problems would use notice and what would happen if you left it, for example what damaged can be caused. also does it affect idling in anyway as mine suffers on idle when the bikes cold but then sorts its self out once the bikes warmer but the ticking occurs while cold and warm.

[mirax]

so what perfomance problems would use notice and what would happen if you left it, for example what damaged can be caused. also does it affect idling in anyway as mine suffers on idle when the bikes cold but then sorts its self out once the bikes warmer but the ticking occurs while cold and warm.

[Simple]

[mr.z]

I'd change the plugs first, or at least clean them.
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>RidingSkills<->Tech Tips<->MyBikes<

[mirax]

changed the plugs which made no difference to the tick over but did give better revs though the range. and yes i always have to use the choke when the bikes cold as it just dies if i try to turn it over, also if i start the bike from warm i have to blip the throttle a little while i hit the starter button other wise it doesnt turn over!!! if that could be something involved with the problem as well maybe ??????

[Simple]

what bike is it?
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Insta - FemFeral

[mirax]

is a vfr400 nc30

[mirax]

is a vfr400 nc30

[IronMaiden]

Why don't you post this under "The Workshop" sure someone will help you there

[mirax]

im gonna strip the body work off tomoz see if its easier to locate the noise , that if it dont bloody rain