Extended air screw

Tedh98 · Post by **Tedh98** » 12:14 pm Oct 15 2009

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.

Post by **fuzzy** » 01:29 pm Oct 15 2009

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.

canyncarvr · Post by **canyncarvr** » 06:01 pm Oct 16 2009

#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?

Post by **fuzzy** » 09:57 am Oct 19 2009

Was just an example...Big flexy T handle.

Tedh98 · Post by **Tedh98** » 06:44 am Oct 20 2009

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.

canyncarvr · Post by **canyncarvr** » 10:44 am Oct 20 2009

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?

Post by **Mr. Wibbens** » 11:24 am Oct 20 2009

I was wonderingf where the spring was at?

Seems it is there for a reason

Tedh98 · Post by **Tedh98** » 12:22 pm Oct 20 2009

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.

canyncarvr · Post by **canyncarvr** » 12:23 pm Oct 20 2009

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.

Post by **Mr. Wibbens** » 12:28 pm Oct 20 2009

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

canyncarvr · Post by **canyncarvr** » 11:24 pm Oct 25 2009

Mr. Wibbens wrote:I'm not talking about the OEM spring.

Neither was I.

KarlP · Post by **KarlP** » 11:07 am Oct 26 2009

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.

Tedh98 · Post by **Tedh98** » 12:24 pm Oct 26 2009

The spring is inside the carb. If you take the AS out you'll see it sitting in there.

Post by **Mr. Wibbens** » 12:34 pm Oct 26 2009

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

Huh?

canyncarvr · Post by **canyncarvr** » 01:00 pm Oct 26 2009

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.

Post by **Mr. Wibbens** » 01:57 pm Oct 26 2009

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

I'd stick with the RB screw

canyncarvr · Post by **canyncarvr** » 06:07 pm Oct 26 2009

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!

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Extended air screw

Extended air screw