Okay...I just dropped by Ty Davis' newly renovated website, and he has the coolest product (...many of you on here know me...I'm not a pimp).

Personally, I have little trouble adjusting my fuel screw. I use one of those disk-type bit-holder things you can get at sears for a buck. It works just fine, once you get the blade of the bit to find the slot on the fuel screw.

Well, Ty Davis makes a fuel screw that has a knob on the end of it, with a white line on it, so you can even count your turns easier. It's $21, so I don't know if I really want to drop cash on it...but what a damn fine idea (...I've seen the welded-key mod types on here. This is way cleaner).

Anyway....I thought it was worth mentioning, because it was so simple, yet he's the first guy to mass-produce one.

http://www.ziptyracing.com

Tex Labo
'01 WR250F (Sweet & For Sale)
'03 WR250F (Elbow Crusher)

I did something like this myself and it costs me nearly noting. Click here.

Wheather or not you "need" one depends on how often you adjust your fuel screw. Some guys want it jetted perfectly for the most power all the time (and easier starting). Other people just want to ride. I sprung for one and am very happy with it. It's kind of like the Dr. D hot start, one of those excellent ideas that should have been on the bike to begin with. The numbered graduations is the feature I liked best. ZipTy also has an awesome magnetic drain bolt for the case with a very strong magnet.

If you read the back of the manual in the "tuning engine" section, you'll see that the mixture screw controls from 0 to 1/4 throttle and does not do much beyond that IIRC - to jet a bike correctly at all altitudes, you'll need to change the needle and/or clip position as well as the main jet accordingly (needle jet too?). Installing one of these permanent mixture screw is nice but WON'T fix the whole throttle range...

I put my Ty-Davis fuel screw on a week ago and love it. It must be a big hit becouse it took over 2 weeks to get it.

They just told me mine is on 3 week backorder

Like I said, It's just a great idea. And of course it doesn't clean up all your jetting. It just helps get rid of that crack of the throttle hickup and such. In Texas here you do have to mess with it. In the spring it's in the 40's and July is over 100 degrees, so fiddling with jets is the norm. But you can often get away with a fuel screw adjustment to make it ride-able with no bog, to get by without digging into the jets.

This little bugger makes life really easy. I'll probably order one after the rush calms down.

Tex Labo

I like yours better than Ty’s, very cool.

10x thegroovemaster! The reasons that I made it myself is that I'm far from USA and I have to pay huge transport fees, and also it is a lot cheaper

Tex, my only concern with a more permanent install of a fuel screw tool is that anytime you want to take the bowl off, you've got to remove the whole screw itself. my KTM buddy just did that & lost the (very tiny) washer & o-ring in the process. as you know, our bikes come w/the same, tiny o-ring & washer that's easy to lose when removing the screw. so, i have NOT installed my tool permenently but rather just use it as necessary. just another thought before installing whatever fuel screw tool you have permenently.

bobwombat

It's a good idea to keep some spare O-rings & washers for the fuel screw on hand regardless of what type of fuel screw you prefer. Sudco has the O-rings (KE 021.043) for $0.63 and the washers (KE 021.045) for $0.53
When you figure how often you remove the bowl compared to how often you may make small adjustments to the fuel screw, the easily adjustable fuel screw comes in handy.
Note-I have Sudco part numbers because I thought I lost the O-ring while changing the fuel screw to the ZipTy unit. It turned out to be stuck in the recess in the bottom of the carb.

Just got the screw. What do I need to know to change it, and what tools might I need? Do you need to take the carb off to make the screw change?
Thanks

My screw is scheduled for delivery on Apr 28th. I am also wondering how this thing is to be installed. I just thought I would unscrew the old one and screw in the new one and fine tune. But now all thise talk of washers and O ring BAH!

Same, I bought it thinking I would just come home and unscrew the stock and stick in the new. Sounds like more is involved. If anyone knows what it takes to change it out, please advise. Thanks

I believe all you have to do is unscrew the old screw and screw in the new one. The o-ring is to seal in the fuel and the spring is to keep the screw in tension (don't lose either of them). Before you replace your stock screw, turn it in all the way and count the revolutions so that you can have a baseline for the new screw (it should be around 2 turns out). Good luck, this should only be a 5 minute job - max. Don't forget to turn off the gas first, you might want to mark the new screw with a sharpie first so that you can tell where the 1/2 and full turn is before installing it...

Thanks, it is now installed. The crux of the procedure was finding a screwdriver that was small enough to get in there. I used the one that came with my dremmel. Now I can appreciate the knob even that much more. Seems to work great! When I took the stock out, of course I could not tell when it was completely unscrewed. I pulled out the screwdriver and the scew, washer, o-ring and spring went flying all over the place. I think I got them on in the correct order-spring, washer, o-ring.

Just got my fuel screw and am planning to install it tonight. I was told that if you loosen the clamps that hold the carb you can rotate the bowl towards you and this makes the swap easier. Sounds good but we'll see if it works.

dmp437,

Quote

I'm being a bit lazy here, but do you have the Sudco part number for the spring?

My Kouba fell out a couple of months ago, and I had to replace the parts. The local Yammy shop wanted something like 30 bucks for those insignificant little pieces.


Later... An edit...

I checked Sudco and see that the spring is 021-041. Cost is $2.31.


Part Name -- Sudco Order No.--- Keihin No. -- FCR Size
33. Pilot Screw, Coil Spring -- 021-041 --- 1290-812-2001 --- all
34. Pilot Screw, O-Ring -- 021-043 --- W9351-11028 ---all
35. Pilot Screw Washer -- 021-045 --- 0301-803-2000 --- all


I did all this just to see the cost savings for Sudco. It definitely much cheaper than a dealer, but I guess the problem then is in minimum order costs and shipping.

I edited my prior message to show some more costs for Carb parts from Sudco.

So, now I'm bumping this message up. What's been the experience of ordering from Sudco? Do you just call up, get the freight charges, and then send a money order to them?

Thanks...