Extended air screw

Got questions? We got answers....
Post Reply
User avatar
Tedh98
Supporting Member II
Supporting Member II
Posts: 1576
Joined: 01:08 pm Mar 20 2009
Country:
Location: Atlanta, Georgia
Contact:

Extended air screw

Post by Tedh98 »

I just finished lengthening the stock air screw. It is difficult to see in the picture, but there is a reference mark on the end.

I'll be going riding this weekend so I'll have a chance to test it out.

Image
User avatar
fuzzy
KDXRider.net
KDXRider.net
Posts: 3437
Joined: 01:29 pm Jun 18 2003
Country:
Location: Fredneck, MD

Post by fuzzy »

Cool! RB's is awesome as well. I've been thinking about coming up with something along the lines of this:

http://www.tsracing.com/store/showdetl. ... 1207&DID=7

But a big one....To adjust while riding.
'91 KDX 200 Project $300 KDX
'95 KDX 200 Project $600 KDX
'94 WR 250 Always a project
User avatar
canyncarvr
Gold Member
Gold Member
Posts: 6943
Joined: 01:07 pm Nov 05 2004
Country: US
Location: The Mythical State of Jefferson

Post by canyncarvr »

#29 Flex-T Low Speed Needle?

Are you playin' tricks with your links again, fuzzy?

That whole thing is supposed to thread into a carb and stay there?

Walbro carbs?


Where's Walbro? :wink:

Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis

bike profile: !clicky!
User avatar
fuzzy
KDXRider.net
KDXRider.net
Posts: 3437
Joined: 01:29 pm Jun 18 2003
Country:
Location: Fredneck, MD

Post by fuzzy »

Was just an example...Big flexy T handle.
'91 KDX 200 Project $300 KDX
'95 KDX 200 Project $600 KDX
'94 WR 250 Always a project
User avatar
Tedh98
Supporting Member II
Supporting Member II
Posts: 1576
Joined: 01:08 pm Mar 20 2009
Country:
Location: Atlanta, Georgia
Contact:

Post by Tedh98 »

The picture isn't that good, but the night before I went riding I took another approach to extending the airscrew. That is stainless steel cable with a brass knob.

I tried both and liked this one better. It is easy to adjust while riding with gloves on and it is much lighter than my first attempt.

You wouldn't realize it when you adjust the stock needle, but there is a lot of slop in the threads of the airscrew. With the all brass extension I made, the slop in the threads became very noticeable with the extra weight of the extension when you turned the screw out past 1 turn.

Image
User avatar
canyncarvr
Gold Member
Gold Member
Posts: 6943
Joined: 01:07 pm Nov 05 2004
Country: US
Location: The Mythical State of Jefferson

Post by canyncarvr »

Re: 'very noticeable with the extra weight of the extension when you turned the screw out past 1 turn.'

..don't know this to be true, but I would suppose that is part of why the larger external spring is used on RB's setup.

It's nice to be able to adjust the air screw easily, ain't it?

Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis

bike profile: !clicky!
User avatar
Mr. Wibbens
KDXRider.net
KDXRider.net
Posts: 4884
Joined: 02:57 am Nov 07 2004
Country:
Location: Playing in the Poison Oak
Contact:

Post by Mr. Wibbens »

I was wonderingf where the spring was at?

Seems it is there for a reason
Warning! This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin.
((Bike Profile))
((Pics))
FIVE OUT OF FOUR PEOPLE DONUT UNDERSTAND FRACTIONS
User avatar
Tedh98
Supporting Member II
Supporting Member II
Posts: 1576
Joined: 01:08 pm Mar 20 2009
Country:
Location: Atlanta, Georgia
Contact:

Post by Tedh98 »

>|<>QBB<
canyncarvr wrote: It's nice to be able to adjust the air screw easily, ain't it?
Definitely. It beats having to carry a small screwdriver around until you get it adjusted.
User avatar
canyncarvr
Gold Member
Gold Member
Posts: 6943
Joined: 01:07 pm Nov 05 2004
Country: US
Location: The Mythical State of Jefferson

Post by canyncarvr »

The little spring on the OEM screw works fine...it's a little screw!

Hang something off of it though...and the little spring becomes less than useful.

The SSS on a modified carby is 2 1/2+ turns out..which makes the small spring less than less than useful.

Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis

bike profile: !clicky!
User avatar
Mr. Wibbens
KDXRider.net
KDXRider.net
Posts: 4884
Joined: 02:57 am Nov 07 2004
Country:
Location: Playing in the Poison Oak
Contact:

Post by Mr. Wibbens »

>|<>QBB<
canyncarvr wrote:The little spring on the OEM screw works fine...it's a little screw!

Hang something off of it though...and the little spring becomes less than useful.

The SSS on a modified carby is 2 1/2+ turns out..which makes the small spring less than less than useful.
I'm not talking about the OEM spring
Warning! This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin.
((Bike Profile))
((Pics))
FIVE OUT OF FOUR PEOPLE DONUT UNDERSTAND FRACTIONS
User avatar
canyncarvr
Gold Member
Gold Member
Posts: 6943
Joined: 01:07 pm Nov 05 2004
Country: US
Location: The Mythical State of Jefferson

Post by canyncarvr »

Mr. Wibbens wrote:I'm not talking about the OEM spring.
Neither was I.

Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis

bike profile: !clicky!
KarlP
Supporting Member III
Supporting Member III
Posts: 1484
Joined: 02:26 pm Jun 29 2005
Country:
Location: Alabama

Post by KarlP »

That doesn't look like a KDX carb. Not that it matters.

I was curious about that SSS on my 220. I don't find one, I also did not try very hard. At 2.5 turns out I was more afraid I was going to lose the screw.

Between 5/8 and 3/4 out seems to be the ticket. I suppose a longer spring could be used?

Anyway, on the OP's carb I don't think the spring is visible from outside the carb, OEM or not.
'08 KTM200xc
'99 CR/KDX Hybrid with that RB stuff done to it
KX100 for the boy
User avatar
Tedh98
Supporting Member II
Supporting Member II
Posts: 1576
Joined: 01:08 pm Mar 20 2009
Country:
Location: Atlanta, Georgia
Contact:

Post by Tedh98 »

The spring is inside the carb. If you take the AS out you'll see it sitting in there.
User avatar
Mr. Wibbens
KDXRider.net
KDXRider.net
Posts: 4884
Joined: 02:57 am Nov 07 2004
Country:
Location: Playing in the Poison Oak
Contact:

Post by Mr. Wibbens »

>|<>QBB<
canyncarvr wrote:
Mr. Wibbens wrote:I'm not talking about the OEM spring.
Neither was I.
Huh? :?
Warning! This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin.
((Bike Profile))
((Pics))
FIVE OUT OF FOUR PEOPLE DONUT UNDERSTAND FRACTIONS
User avatar
canyncarvr
Gold Member
Gold Member
Posts: 6943
Joined: 01:07 pm Nov 05 2004
Country: US
Location: The Mythical State of Jefferson

Post by canyncarvr »

Re: 'Huh?

The OP made his own extension for the air screw..kept the internal little spring. That little internal spring does work fine for the OEM screw..but the EXTERNAL spring (like RB uses) works better for his (or any other fashion of making an..) extended, finger-adjustable screw.

Re: 'I was wondering where the spring was at? Seems it is there for a reason'

It's not there..the OP obviously doesn't have one on his rendition. And, yes..it is there for a reason..that being:
Hang something off of it (add to the OEM screw) though...and the little spring becomes less than useful.
...all of which I'm sure you got the first time......


Re: 'I was curious about that SSS on my 220. I don't find one, I also did not try very hard. At 2.5 turns out I was more afraid I was going to lose the screw.'

It's there. The screw won't fall out (assuming you are using one of RB's screws with the larger external spring). It's not always right @ 2 1/2 turns out. Mine this time of year is closer to 2 3/4. You will feel it instantly when you find it. It's unmistakeably 'there'...easily noticeable in even 3rd/4th gear by way of throttle and engine response.

Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis

bike profile: !clicky!
User avatar
Mr. Wibbens
KDXRider.net
KDXRider.net
Posts: 4884
Joined: 02:57 am Nov 07 2004
Country:
Location: Playing in the Poison Oak
Contact:

Post by Mr. Wibbens »

Seems like an aweful lot of trouble for a pretty inexpensive part

I'd stick with the RB screw
Warning! This member tends to use sarcasm as a regular form of communication. If a post seems offensive, before you panic and fly off the handle, re-read the post and imagine it being said with a sideways grin.
((Bike Profile))
((Pics))
FIVE OUT OF FOUR PEOPLE DONUT UNDERSTAND FRACTIONS
User avatar
canyncarvr
Gold Member
Gold Member
Posts: 6943
Joined: 01:07 pm Nov 05 2004
Country: US
Location: The Mythical State of Jefferson

Post by canyncarvr »

Nothin' wrong with some good 'ol ingenuity and a DIY attitude!

If <whatever> works OK and ain't broke so doesn't need to be fixed....improve it!

Consider the source
Using a perceived level of knowledge to boost my self worth.
Non impediti ratione cogitationis

bike profile: !clicky!
Post Reply