WTF is a compression screw?

[Timmay]

After having spend a couple of weekend's trying to get a mates SR250 to idle properly with no luck he took it to a shop mechanic who fixed it by adjusting the "compression screw". What on earth is a compression screw? I have worked on cars and bikes for years now and have never heard of such a thing. The internet is no help either. Does anyone know where this mystical screw is and what it does?

Thanks to all in advance

TTTTTTTTTTTTIIIIIIIIIMMMMMMMMMMMMAAAAAAAAAAAAYYYYY YYYYY

[Pussy]

I think someone's pisser may have been pulled here....

[Katman]

And he probably used a left handed screw driver.

[AllanB]

That's when you are doing the rude stuff with your girl and your flatmate runs into your room and jumps on your back.

Compression screw.

[tri boy]

It's a screw that raises pressure via friction.
A 14" "populating tool" is the recommended size to adjust it with.........

[speights_bud]

And he probably used a left handed screw driver.

You can actually get those....

[Rodney007]

its not so much of a screw but more of a bung type button
that sits on the outermost cylnder bore

[Jantar]

And he probably used a left handed screw driver.

You can actually get those....

Specially designed for left hand thread screws.

[speights_bud]

Specially designed for left hand thread screws.

or for the semi assisted removal of right handed screws....

Bugger it, i'll just use glass head nails next time...

[TLDV8]

You can actually get those....

Very handy when it comes time to change ones blinker fluid or muffler bearings.

[Drew]

All screws compress something. That said however, methinks the mechanic did something real simple, that took him weeks to find the first time he had the problem, and tried the baffle with bullshit approach when explaining to your friend.

[Timmay]

so it is a screw/bung at the top of the cylinder bore which raises compression......still not exactly sure how this works.....anybody got a link to a website explaining this, pictures would be useful

[speights_bud]

Very handy when it comes time to change ones blinker fluid or muffler bearings.

Got a digital plumb bob to check that with?

[sAsLEX]

Very handy when it comes time to change ones blinker fluid or muffler bearings.

The amount of times people have been told to get a bucket of striped paint by their senior rates, or to go get a bucket of steam

[speights_bud]

The amount of times people have been told to get a bucket of striped paint by their senior rates, or to go get a bucket of steam

Striped paint ACTUALLY exists. it's not actually 'stripey' more like a base colour with a speckle of secondary colour...