Fuel mix screws

[TSM]

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

[21QUEST]

You've got to drill them out.

Cheers
Ben

[TSM]

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

[Itching 2 go]

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

[21QUEST]

Has anyone done this here?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

[northwind]

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

[21QUEST]

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

:roll: :roll: :lol:


Cheers
Ben

[svrash]

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:

[PeterM]

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.

[Sid Squid]

Since when was brass rubbish?

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

[21QUEST]

When it gets fooked by someone I guess :? :wink:

Cheers
Ben

[TSM]

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.

Tried WD4-, even left it for a while. Did not work, they seem set solid.

What about thoes bits to remove broken bolts? Will they work?

If i try to drill it out then i am guessing that it will have to be something like a 4mm bit then use a 5mm tap to take the old stuff out and put it back to normal (dont know what the sizes are)??

[PeterM]

Last resort should be drilling. Try to give the end of your scredriver a good knock with a hammer to try and free the thread up a bit. (Place screwdriver on head of screw and hit along axis of driver & screw like hammering a nail in) Sometimes this will free the thread.

If you do have to get a tap, get the smallest you can find, it's not a terribly big screw.

[TSM]

Tried that as well.

[21QUEST]

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.

Tried WD4-, even left it for a while. Did not work, they seem set solid.

What about thoes bits to remove broken bolts? Will they work?

If i try to drill it out then i am guessing that it will have to be something like a 4mm bit then use a 5mm tap to take the old stuff out and put it back to normal (dont know what the sizes are)??

I take it the head is wrecked. Drill bit wise 4mm is too big to off with. You wan't to start with the really ickle ones 1mm/1.5 and go from there.

You'll need a new screw and the o ring. Have you got those already. Shoot me a PM(with phone number) as I may be going to Dulwich tomorrow.
That being the case provided you need to get your bike on the ASAP I'll get you a carb and you can nick an air screw off it. I'll of course be need you to post a replacement to me..

Cheers
Ben