You could add s pring from a ball point pen. then you can be 3 turns out + & still have sufficient spring pressure on it to keep vibration from backing it out.. hopefully...  

I know this is a old thread.  

I bet your bike is screaming now due to the lack of posts now.

I am just wondering what the final set up was.

I got the Jardine w/cone filter on my 2001 but my air mixture screw is all the way in with no hope of turning out. Anyone know what the stock jets on this are and what I should go up to?

Just bumping this thread to see if anyone else has Jardine tuning experience. I've been working out some issues brought on, at least partially, by trying to do things quick instead of right. I got them sorted out and this is where I am at as of today:

  -Took the bike over to a buddy's house and had him weld the Jardine to the header pipe. I didn't want to weld it initially, as an aftermarket pipe, but I was not sealing it any other way. Looks good right now- no noticable leaks at header or muffler/header joints.
   - After trying a couple things: currently at a 55 pilot, 1/2 spacer, and 152.5 main jet, 2 turns (approximate) out on idle mix screw. I've got a noticable increase in power and change in power band. So much so that at times I felt like I had another gear- but top-end aside the major improvement is in low/mid-range.
   - Backfires have significantly decreased, but still have occasional backfire on decel from around 1/4 throttle. Going to try dropping down to 1/4 spacer and see if it goes away. First, I am going to tape and mark my throttle/throttle housing and see if I can nail down where the lean mix is more specifically. Backfires decrease to almost none with choke out to the first notch. That tells me it HAS to be a lean mix in the idle/midrange circuit. Ideas?
  - I HAVE CAUSED a shut-off afterfire which did not exist before. Not sure what that is about. Hopefully it will resolve with additional spacer mod. Or I don't have the idle mix tuned right.
  - Raptor Petcock is installed, and I am running a Uni foam filter. I need to double check the seal at the vacuum ine after replacing the petcock. Right now it is a tube filled with sealant, doubled over and zip-tied shut. Not sure if an incomplete seal there could be causing issues.

  I live in San Antonio. I don't know what altitude I am at, but today reflects the info above, and it was cool and clear in the 50s and low 60s F.

I have a Jardine Muffler welded on so there are no leaks. It has the stock air box.  

I am at 4500 Feet.

Running stock spacer on the needle and 145 Main Jet with 55 Pilot Jet.  1.5 turns out on the air fuel mix screw. I only get a little crackle no popping on deceleration and a small puff on shutoff unless Idle for 15 or 20 sec before shutting off then no poof at all.  

I think I have mine dialed in great at the moment and I think it depends on the bike the altitude the temperature humidity etc.  just gota mess with it and see.  I was able to do all my re jetting while still having the carb attached to the bike just dropping the float bowl.  it wasn't that hard I adjusted and swapped jets multiple times to find what worked.

BOBD wrote on 11/12/12 at 13:36:45:

you should go up a size... after 3 turns the spring and o-ring that hold it in place get a little weak.

Thanks all. I've read up on the carb tuning posts several times and have worked on car carbeurators before. I feel very comfortable with the theory, I'm just surpised at that I still seem to be running lean at the low end with a half spacer mod and 55 pilot installed. Just gathering anecdotal info to double check myself.
  honestly, if I had a garage instead of a parking lot to do the work in this wouldn't be nearly the hassle. I'm trying to save work at this point

 I am going to tape the throttle and throttle body off today and mark them so I can get a solid idea of where the backfire is happening. Just by feel and eyeballs, though, I think the backfires are happening on decel from around 1/4 throttle, which is why I am hoping knocking the spacer down to a 1/4 equivalent will do the trick.