Stage One kit problems

I need help!!

I bought & installed the Stage One tuners kit (re-jetting kit) for my 2005 1200 Sportster.
I took much care,taking everything apart, and in reassembly.
I installed the .45mm pilot jet.
I have a Hypercharger air cleaner on the bike, but have not yet installed new slip-ons.

The bike started up after an initial choke, and is still running.
I also purchased the larger thumbscrew idle adjuster(the EZ-Just Mixture screw).

With the bike warmed up, and idling at 900 rpm, I can screw in the idle mixture screw all the way in, without the engine choking, or coughing, or even rough running?? I don’t think that you are supposed to be able to do this?? Does anybody know why??

After I have adjusted the screw out 2 to three turns, then if I am lucky, I can get the engine from backfiring, and spitting(carb farts) when going from idle to a rapid acceleration ? No matter where I turn the screw(in or out) there is no change in the idle rpm, or roughness?
Today, after trying several times, I think that I had the idle adjusted properly.
But then, after several test runs, I discovered that when cranking the throttle, the initial response is fairly fast...but upon reaching around 4,000 RPM, that the bike hesitates, and it feels like is is starving for fuel??

Anybody, anywhere got any ideas??
Please help! My sporty is now running worse than it did before the stage one Kit?

Randy Brandon

check carefully for air leaks around the carb boot, use an unlit propoane tourch with the motor running and hold it around the carb boot and intake manifold area. if you don't have a tourch you can use carb cleaner and sray in those areas, it just messer, listen for the motor to pick up rpm's.

Thanks guys...i will be checking all of the potential problems that you listed.. And will let you know what i find.... Thanks again!!
Clicks, randy

You are adding a heck of lot more air with that HC on. I would try a 46 pilot and leave the main jet alone for now. Your problem is on the pilot circuit. If you did not do any other modifications to your bike there shouldn't be a need to change the main jet...JMO

It does seem like a lot of guys have problems with the CVP Idle Mixture screw. What's up with that?

I do not think that it is the kit per say........Have you done the other checks that have been suggested???

I think that you have added too much air to your system...Fatten up the pilot step by step until you are happy. (Just a note) Your pilot circuit is good for only about a 1/4 throttle, after that, you're pretty much on the main...

JMO: mostly it's the guy doing the tuning. The EZ screw is just that made to make turning it easier for the tuner, If you're not happy with the EZ put the stock one back in and see if it works better. like I said Just My Opinion

Ken,

The vacuum leak sounds like it is the first thing that I must check on, and will do that shortly to confirm or unconfirm the problem.
Thank you all in advance, there are a lot of possible causes, and I am in the process of eliminating them, one by one...

Thanks again to all.
Really appreciate your sage advice..

yep, I have the complete kit in my carb less the EZ adjust screw, I've never found it that difficult to use a small screwdriver to adjust the screw. On my wifes bike I have a complete carb rebuilt by Ken from back in the early to mid 00's, it has worked flawless on 2 EVO's and is now on a TC88.