What Peteski said
Did mine recently for the first time. The advice I got was:
- Dismantle 1 carb at a time.
- have 4 labelled bowls at the ready, and keep the parts for each carb separate.
- Take your time! Make sure you aren't going to be disturbed for a spell, they are time consuming.
- Have carb cleaner, toothbrushes, etc to hand before starting.
- When removing the pilot jets, first nip them up lightly, and count how many rotations it takes. Record this, then remove them. Makes it much simpler to return to original settings
I think you mean pilot screws
The secret is cleanliness, the cleaner the area you are working in the less problems, if you remove the diaphragms don't let petrol near them or they will swell. Try putting the covers back on over swollen diaphragms
Christos advice is good
If there is a blocked jet, I usually use good quality cellulose paint thinners to wash them and use a fine brass wire to poke through if necessary (I use the bristles of a soft brass brush), don't use anything else brass on brass does no harm but steel on brass will.
Be careful not to over tighten the brass jets and don't lose the needle guide above the emulsifier tube, (Yamaha call it the Main jet holder) they are a push fit and the odd one can fall out.
Use good fitting screwdrivers and sockets
Again as Christo says take you time.
![Shocked :eek](https://foc-u.co.uk/Smileys/efocicon/shocked.gif)
I have agreed with Christo twice