Screw Below the Carb - Couple of Questions

[nheather]

My engine has a screw just below the carb. It doesn't fix anything, just fills a hole. So a couple of questions

1 - What is it for. The only thing I can think of is a lubrication hole for the crankshaft - but you can do that by squirting oil down the carb throat.

2 - I'm ready to seal my engine. None of the tutorials mention this. The screw has a fibre washer - is that sufficient or should I add copper gasket material. If I do then should I keep the fibre washer in place or remove it?

Many thanks for the help.

Cheers,

Nigel

Edited April 12, 2010 by nheather

[mixmasterjay]

i would say its for the idle gap mate , look down the carb(without the filter on) and turn the screw a rew turns and see if it moves the gap either smaller or bigger , but remember how many turns yuo did it so you know where to put it back lol

[Jonny555]

Sure it's not the pinch pin to hold the carb tight?

What engine is it? If we know this we can find a picture, unless of course you can upload one.

[dewis93]

it prob just there to keep your carb in m8, nothing to do with the mixture needles

[nheather]

It's a Mach 8.

Not an idle gap - this screw is in the engine crankcase, not in the carb.

No it isn't the cinch bolt that holds the carb in.

I'll try and sort out a picture.

Cheers,

Nigel

[dewis93]

does it have a nut on the other end of the screw ?

[nheather]

You can see it in this picture

No nut on the end - the crankcase is threaded.

Cheers,

Nigel

[prussian.guard]

You can see it in this picture

No nut on the end - the crankcase is threaded.

Cheers,

Nigel

its so you can put a boost chamber onto the engine.there not really worth putting on and you will need a starter box to start it.

[nheather]

Many thanks - mystery solved.

So given I'm not going to be fitting the Boost Chamber what is the best way to seal the screw - I have some copper based silicone gasket - should I use it with or without the fibre washer.

Cheers,

Nigel

[fraggs]

Many thanks - mystery solved.

So given I'm not going to be fitting the Boost Chamber what is the best way to seal the screw - I have some copper based silicone gasket - should I use it with or without the fibre washer.

Cheers,

Nigel

use it with the washer, put a bit on both sides of the washer and screw in the screw, sorted and sealed no leaks from mine

[nheather]

Will do - many thanks.

Nigel