Fuel mix screws
 

As the dynojet kit says, you should adjust the mixture screws on the SV, well i have tried. Seems like it has been touched before as the screw is damaged, i tried to turn it but it will not budge. How can i sort this out, is it because the screw is rubish brass and has deformed.

PS. what is the standard jetting on the SV, mine had 137.5 in there

You've got to drill them out.

Cheers
Ben

Has anyone done this here, whats the best way.? Best to use a hand drill i guess.

I haven't and I certainly wouldn't suggest doing it on my pc monitor, try holding it in a vice instead! :P

:)

Yep done it. You have to really careful. Start with the smallest drill bit(as tiny and go slowly and keep an eye on the dept.

Use a hand held vacumm cleaner to suck up the brass shavings as you go along.

Cheers
Ben

And then after you've *****d it up, SV carbs are pretty cheap ;)

:roll: :roll: :lol:


Cheers
Ben

Wrap some tape around the drill bit about 3mm down and you won't drill any deeper then where the tape is ***super tip*** :lol:

Might want to try WD-40/RP7 or whatever you guys have for loosening threads before drilling away. The air screws shouldn't be that hard to move, unless someone has set them at the std 2 1/2 turns out and used threadlock (completely unnecessary).

Yes, 137.5 Mikuni mains are std from the factory too.

Since when was brass rubbish?

It's an entirely appropriate material for jets, mixture screws etc.