HO!! a valve is missing

[fzalfa]

hi

i was riding in town quietly, when sudently a weird noise appear.....

i bring the bike at home, check the timing chain, tensioner, presence of all the rockers, and
after dismantling the carbs, i notice a inlet vlve was missing on the 4th cylinder.

is it commun ?
why this can appear ?
i 'll open the negine tomorow, so what sort of destruction may i expect ?

regards

Laurent

[CaNsA]

so what sort of destruction may i expect ?

[fzalfa]

hum hum....

ok , this seem this can be expensive and/or the engine is good for trash.... ?

Laurent

[extonyg]

im suprised you stil managed to ride it home if it had 'dropped' a valve.are you sure its definatly not there?if it has 'dropped' a valve into the cylinder there can be all sorts of damage .....piston, bore and even head damage.could be time for a new engine.take the head off and have a look so you no where you stand.
be good to see some pictures if you can as well.

[fzalfa]

no i didn"t ride it to home, i call the assistance (they love me after several engine failure with 250 RGV....)

so i have open the engine, i can said god exist:

the piston is lightly marked
the valve is broken under the upper dash clip nd the guide is broken and have limited the stroke of the valve, so it only move a bit more than usualy...

so, i must replace the valve, and the guide....

it's expensive to replace a guide ??

Laurent

[extonyg]

well you were very lucky then by the sounds of it.no im sorry i dont no how much it would be.
be good to see some pictures if possible everyone likes to have a look

[fzalfa]

why did the valve break ?
too old ??
a building error ?

it appear i"m not the only one with a 4th cylinder inlet valve broken....

Laurent

[fzalfa]

hi

should i change the broken valve, or is it better to change all the valves ?

regards

Laurent

[fzalfa]

hi

so, i spend 87 euro for the parts

- valve
- valve seal
- guide + clip
- head gasket
- oil toric seal

now w8t for the parts and then bring the head to specialist to replace the guide, regrind the seat .... and it done....

regards

laurent

[RedexRobB]

glad your getting it sorted Laurent, quite unusual for a valve to go.