Is there no o-ring and washer behind a pwk airscrew?

Got questions? We got answers....

Is there no o-ring and washer behind a pwk airscrew?

Postby Actionman » 06:15 am Sep 05 2013

Just curious. The parts diagrams don't show one either. Seems kind of odd.
2002 KDX 200
User avatar
Actionman
Supporting Member I
Supporting Member I
 
Posts: 622
Images: 5
Joined: 09:08 pm May 22 2013
Location: Parts unknown
Has thanked: 0 time
Been thanked: 3 times

Is there no o-ring and washer behind a pwk airscrew?

Postby cornishwrecker220 » 09:23 am Sep 05 2013

not on the pwks fitted to older bikes like the kdx etc..I think there is on the modern ones fitted to ktms /husabergs etc...I wrap a small piece of ptf tape ( used on boiler/gas fittings) around mine just to make it seal better..likewise on the tickover screw..i know on a 4 stoke fuel screw theres a small o ring & washer.
cornishwrecker220
Member
 
Posts: 704
Joined: 06:37 am Nov 22 2009
Location: united kingdom
Has thanked: 0 time
Been thanked: 47 times

Is there no o-ring and washer behind a pwk airscrew?

Postby Actionman » 10:36 am Sep 05 2013

Yeah, I was just double checking. Thanks wrecker. I have an o ring and washer ill fit to see if it helps or hurts.
2002 KDX 200
User avatar
Actionman
Supporting Member I
Supporting Member I
 
Posts: 622
Images: 5
Joined: 09:08 pm May 22 2013
Location: Parts unknown
Has thanked: 0 time
Been thanked: 3 times

Is there no o-ring and washer behind a pwk airscrew?

Postby cornishwrecker220 » 11:11 am Sep 05 2013

How come you have decided to fit an o-ring & washer to the kdx pwk?? have you purchaced a new air screw by any chance??
cornishwrecker220
Member
 
Posts: 704
Joined: 06:37 am Nov 22 2009
Location: united kingdom
Has thanked: 0 time
Been thanked: 47 times

Re: Is there no o-ring and washer behind a pwk airscrew?

Postby Actionman » 11:17 am Sep 05 2013

Nope. Same ol airscrew. I had a yamaha raptor for my kid that I just couldn't get running right down low. I rebuilt the carb, checked compression, cleaned filters, etc. one day I noticed it had no o-ring or washer on the airscrew. I added them, and whatta you know, it cleaned up the saggy spot on the low end. What I think happens is wear in the bore more than anything, and an o ring might seal it better. My Kdx, though, needs either a leaner main(155 current) or a step leaner needle. I'm just going through the entire bike fixing problems the previous owner neglected, and I thought of that airscrew o ring . You know how it is, try anything to achieve performance perfection lol.
2002 KDX 200
User avatar
Actionman
Supporting Member I
Supporting Member I
 
Posts: 622
Images: 5
Joined: 09:08 pm May 22 2013
Location: Parts unknown
Has thanked: 0 time
Been thanked: 3 times

Is there no o-ring and washer behind a pwk airscrew?

Postby cornishwrecker220 » 11:37 am Sep 05 2013

since wrapping a little ptf tape around my air screw & tickover screw my jetting has been more easy to set up/ tune...I think air can & will get sucked in when the bike is running making it difficult sometimes to get things spot on...I first noticed a while ago when I came back from a dusty ride that I had damp patches around these screws where fuel could clearly be seen absorbed by the dust ...since applying the tape theres no more damp signs & the bike idles perfectly too.
cornishwrecker220
Member
 
Posts: 704
Joined: 06:37 am Nov 22 2009
Location: united kingdom
Has thanked: 0 time
Been thanked: 47 times

Re: Is there no o-ring and washer behind a pwk airscrew?

Postby Actionman » 12:24 pm Sep 05 2013

Absolutely! Most threads aren't completely airtight, especially when there's an air pump on the other side of the screw. That's why, like you, I feel that airtight airscrew is the way to go. ANY small leak in that area has to be bad, and that area affects the throttle range that is giving me trouble.
2002 KDX 200
User avatar
Actionman
Supporting Member I
Supporting Member I
 
Posts: 622
Images: 5
Joined: 09:08 pm May 22 2013
Location: Parts unknown
Has thanked: 0 time
Been thanked: 3 times

Re: Is there no o-ring and washer behind a pwk airscrew?

Postby bufftester » 03:35 pm Sep 05 2013

I also use a bit of teflon tape around the screw threads on the air screw, but behind it is just the spring. Washer an o-ring should be fine as long as you don't lose any adjustment range.
2001 KX/KDX 220 Hybrid, 1999 KLX 300, 1995 RMX 250, 1992 GSX-R600, 1993 GSX-R750, 1994 GSX-R750, 1995 GSX-R750
Jetting Guide | Scheckaet's Newb Guide | Suspension Goodness
User avatar
bufftester
Platinum Member
Platinum Member
 
Posts: 2060
Images: 165
Joined: 06:03 pm Oct 31 2012
Location: University Place, WA
Has thanked: 3 times
Been thanked: 133 times

Re: Is there no o-ring and washer behind a pwk airscrew?

Postby Actionman » 06:44 pm Sep 05 2013

Just got in from installing my carb again with o ring and it did indeed seem to help. Sadly, my bowl gasket started leaking, so until I fix that its untested.
2002 KDX 200
User avatar
Actionman
Supporting Member I
Supporting Member I
 
Posts: 622
Images: 5
Joined: 09:08 pm May 22 2013
Location: Parts unknown
Has thanked: 0 time
Been thanked: 3 times


Return to KDX General Q&A

Who is online

Users browsing this forum: Google [Bot], Majestic-12 [Bot] and 5 guests