Air Screw Question

Got questions? We got answers....

Air Screw Question

Postby Johnny » 12:11 pm Dec 14 2006

Two questions:
1.) What is its purpose and how does it work?

2.) Mine was 6 full turns out from its seated position. I have KDX220 with the bored carb to 35 by Fredette. Just wondering if this seems right?

The bike runs great and I have never had any problems with the carb, it just seems like 6 turns is alot especially when the manual says 1.5 turns.

Thanks,
John
Johnny
Member
 
Posts: 36
Joined: 09:17 pm Oct 01 2006
Location: Michigan
Has thanked: 0 time
Been thanked: 0 time

Postby m0rie » 12:19 pm Dec 14 2006

Yeah that doesn't sound right at all. What jets/needle do you have in the carb?
1989 KDX 200
2007 TTR-50E
User avatar
m0rie
Supporting Member I
Supporting Member I
 
Posts: 2220
Joined: 10:25 pm Nov 29 2004
Location: Crescent City, CA
Has thanked: 0 time
Been thanked: 0 time

Postby Johnny » 12:26 pm Dec 14 2006

Not sure. Haven't had it apart, just bought the bike used in August have been riding it but not to much taking things apart. I am saving that for the winter (give me something to do while its snowing). Also, this is my first dirt bike so I am kind of learning as I go . I have already learned so much from this forum.

What air screw adjustment is considered "normal" for modified carbs such as mine?
Johnny
Member
 
Posts: 36
Joined: 09:17 pm Oct 01 2006
Location: Michigan
Has thanked: 0 time
Been thanked: 0 time

Postby m0rie » 01:05 pm Dec 14 2006

Functionally you should be using the same adjustments as a stock 35mm PWK. Right around 1.5 for a starting point. However your jetting should have changed a bit with the larger carb size. Your wacky air screw setting could be masking bad jetting or more likely an air leak.
1989 KDX 200
2007 TTR-50E
User avatar
m0rie
Supporting Member I
Supporting Member I
 
Posts: 2220
Joined: 10:25 pm Nov 29 2004
Location: Crescent City, CA
Has thanked: 0 time
Been thanked: 0 time

Postby Johnny » 11:35 am Dec 18 2006

Yeah, I counted the turns wrong. It was really only 3 FULL turns out. For some reason, I was counting 180° as a turn. Anyway, I backed her down two 2 (full) turns, adjusted the idle, and it runs great. I also did alot more research and was able to answer my own questions. (I should have done that in the first place). So, I don't habe no leaks, (as turing the screw effected the bike in the proper range) and I my pilot jet is the right size.

Thanks for the response.
Johnny
Member
 
Posts: 36
Joined: 09:17 pm Oct 01 2006
Location: Michigan
Has thanked: 0 time
Been thanked: 0 time

Postby grump99 » 01:03 pm Dec 18 2006

Good deal! :supz:
grump99
Member
 
Posts: 201
Joined: 10:51 am Mar 09 2006
Location: Harrisburg, PA
Has thanked: 0 time
Been thanked: 0 time


Return to KDX General Q&A

Who is online

Users browsing this forum: Baidu [Spider] and 12 guests