not a good day

ok i just got this bike last week been riding it alittle well today after a 3 maybe 4 hr ride she started missing alot and backfired a few times then would clean up in the high rpms so figured plugs....got home pulled the plugs #1,2,3 white i mean lean...i'm talking LEAN and #4 looks like im running on coal....now here is the good part my bike has pods and a supertrap exhaust i pulled the carbs jets are 40 and 120 sounds stock to me.........so i look at my next thought pilot screws 1,2,3 all around 2 3/4 to just under 3 turns out but 4 no joy won't budge i'm talking stuck frozen and the head is stripped :x i could get a slight movement out but she is turn al the way in....gee wonder why i'm loading up and have no bottom end???????so fellow brothers of the XJ what to do about the screw how do i get it out of there and am i on the right track here or did i over look something other than needing a rejet on the carbs?

 

extractor should shift it, as there is some movement.

 

dunno not sure she is tight takes all i have to get just that little bit of movement and she makes the bad noise when you do i keep waiting for the snap.........how far can i drill into it????

 

you should be able to drill 1/2" deep with impunity. make sure you're centered though.

 

There are some differences to Pilot Mixture Screws.
The right thing to do?

Remove one of the others.
Measure its diameter and depth.
Wrap a few turns of Masking Tape around the Drill Bit at the appropriate depth to act as reference for you not drilling too deep.

 

I had this same problem with two of my pilot mixture screws on my carbs. Be very careful when drilling them out as you can actually ruin the carb body! The hardest part of extracting them is drilling them in the CENTER. I used a punch to make an indent in the center of the mixture screw so that the drill bit would wander towards the indent and drill directly down the middle. I started with a real small drill bit and worked my way up to a bigger one until I reached the size that was needed for the particular extractor bit that I owned.

Of the two mixture screws that were stuck, one extracted with no problems. The other wanted to be a pain in my rear and the extractor bit would just dig away at the soft brass. I had to use alternate methods on that mixture screw and gradually increase the size of the drill bits and keep drilling it out until there was practically no brass showing and I could pry bits and pieces of it out with a pair of pliers. Unfortunately, I didn't get the direct center of this mixture screw so I wound up drilling some of the carb body and mixture screw threads out. I wound up purchasing an M6x0.5mm bottoming tap to clean up those threads. Even though I drilled some of the threads off, there is still about 75% of them left and the mixture screw still threads into the hole, so I think I should be good.

 

Great job Wombat! Takes a steady hand and nerves to pull off that trick!

 

Well, to be honest, I had a friend do it in his drill press, but I was there the whole time!

 

I won't tell if you don't...

 

I also have to thank RickCoMatic for helping me out with the tap size and type. Thanks buddy!

 

well i figured out the problem yeah the screw is stuck but lol stuck where it should be...found the loading/rich problem.......the plunger and needle in #4 the retainer and spring that hold the needle came loose popped right out of the passage and was side ways in the carb didnt notice it at first i wasn't thinking about it then i flipped the carb over and low and behold it was out damn this thing is a whole new bike