It's 1 1/2 turns in on the equivalent lower size pilot jet. Whats the temperature in your area? I think Dale is over using the upped pilot jets. His kit didn't use to come with the larger pilot jet however a few people needed them for where they were living so he threw it in there and recommend it in his instructions. It makes it horridly rich down low, he also forgets to mention in the instructions that if you go up one on the pilots you must turn in the screws 1 1/2 turns in(got that from factory pro) to get the equivalent mixture at idle with the stock ones. So say you are 4 turns out on 15's that means you will be 2.5 turns out on the 17.5's to get the equivalent idle mixture.
So his recommended settings:
3.75 turns out on the 15's would be
2.25 on the 17.5's
4 tuns at the 15's = 2.5 at the 17.5's etc. etc.
You may have to go back to the 15's after you pop the 112.5's in there, but maybe not depending on your bike. For me the 17.5's, it was horridly rich and I'm at only 1000 ft altitude. His recommended settings were wonky on my bike. Super rich down low and cruise, lean up top. So I popped in the stock pilots and have them to 4 turns out for now, but I know its a bit much should be more to his recommended 3.75 turns out but I'll have to test in the spring. Really his instructions should read: "If you go past 4.25 or 4.5 turns out then go the next pilot up and turn the mixture screws in 1 1/2 turns in". You can't just arbitrarily suggest everyone goes up on the pilots. Pilots and cruise mixtures are not usually an issue on these bikes, it's all top end and mid-range thats weak. If you went to a stage 2 then I could see you needing larger pilots but for a stage 1 which is mostly a stock config, I think it's a bit much. At low throttle inputs the 1.5" hole isn't making that much of a difference. Only at larger throttle inputs does it really come into effect and that's all needle and mainjet. Plus the mainjet size will have a small effect on cruise and down low anyway.
75% of the cruise and idle mixture is dictated by pilot size
25% is the mixture screw setting.
So if your rich on the pilots, even if you bottomed out the mixture screws it would only kill off 25% of the needed mixture for idle. However 25% is alot and since the stage 1 is really only coming into play at larger throttle inputs the pilot jet in the stock configuration can probably do the job just fine as you are using the stock filter. If you go to a K&N pod type situation then you will defiantly have to go up on the pilots as the air flow dynamic has changed. I'm keeping my 17.5's in case I need them when going to the K&N panel filter stage 1 but I doubt I'll need them. Pods however is a different story.
Since you're already at 110's + 17.5's your about the same overall in jetting to what I am at, but if the pilots are supplying that extra 2.5cc of jetting down low it's in the wrong rpm/throttle range. Maybe you like me need more up top, and less down low. Put it this way. You have 110 main jet + 17.5 pilot jet so you are supplying 127.5 cc/min fuel max(+ or - mixture screw settings). I have a 112.5 main + 15 size pilot so I'm at 127.5 max as well, we have the same overall jetting however I'm supplying the extra juice up top where it's needed. While the pilots do add to the overall jetting, on the stage 1 all the juice needs to be at the top not the bottom. So when you are tuning your bike your using the mixture screws to adjust idle and cruise to not be so crazily rich so any advantage of those larger pilots helping you up top is lost a bit. The sole function of the pilots is to provide cruise and idle and below 1/4 turn throttle inputs. I know Dynojet likes to use mainly the pilots as a crutch to provide a disproportional amount of fueling in their kits, that's why they suck on the GEN2 Bandits, the pilot is too small to provide the kind of fueling needed by their fueling philosophy and why their mainjets are actually LEANER than stock and use their specially tapered needle to provide a fueling profile. Some guys like to tune their bikes to be super lean at cruise to get fuel milage but have huge mainjets so when they are on the throttle they have power. However this is at a cost of drivability and below half throttle performance. It's sort of a all or nothing thing which some guys like.
EDIT:
Sorry forgot to mention I'm back on the stock filter. The K&N needs probably at least 115's or 117.5's to be good. I'll try that out in the spring maybe, it's running pretty good like this:
15 pilots 4 turns out(slightly rich but it's cold out 3.75 should be good in spring)
112.5 mains One up from Dales recommended settings
5 shims.
Stock air filter
1.5" hole in the airbox.
snorkel in
