Ok, I decided to revisit this thread, so other's who may have a similar question would have a definitive answer:
After replacing the stock sprocket set up (15/47) with my new set up (14/49), I installed a new 108 link chain. IT DID FIT, but the rear tire needed to be adjusted all the way forward. I'm assuming with some expected chain stretch, it would probably end up near the middle of the adjustment range. Unfortunately for me, I installed the chain incorrectly. (see: stupid ebay seller didn't include pinch pin for master link in package, so I assumed it didn't need one.) Lucky for me, I still had both of my legs attached, and was able to get a replacement chain in 110 link. Again, this was a brand new chain. The 110 link, when correctly adjusted, fell near the middle of the adjustment range. I've since put about 600 miles on my 110 link chain and readjusted it. It's now sitting about a 1/4" past the mid point in the rear tire's adjustment range. I expect to have plenty of room with my 110 link, even if it does stretch further. I hope this is helpful.
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2002 Yamaha YZF 600R ThunderCat
DynoJet Stage 1 Jet kit/ Yoshimura RS-3 Carbon Fiber Exhaust/ Mototeck Undertail/ Custom Yamaha Blue Paint Job/ Powder Coated Rims/ Blacked out Frame and Engine/ Flushmount Carbon Fiber Turn Signals/ Carbon Fiber Frame Sliders/ Carbon Fiber Yamaha Tuning Fork Bar Ends/ Carbon Fiber Levers/ Custom Carbon Fiber Seat/ Skur Carbon Fiber Gauge Cluster Cover/ Skur Carbon Fiber Ignition and Triple Tree Cover/ 120/70 Front and 170/60 Rear Tires/ 14/49 Sprocket Set up/ 110 Link X-Ring Chain/ 2001 GSXR 1000 Carbon Fiber Mirrors/ Zero Gravity Sport Touring Windscreen/ Heli Handlebars/ Yamaha Tuning Fork Carbon Fiber Brake Fluid Reservoir Cap/ Carbon Fiber Tank Cover/ Factory Pro Shift Kit/ Blue LED Gauge Cluster Lights
GP Shift Set Up/ R6 Shock Swap/ Pyramid Seat Cowl/ Braided brake lines/ Carbon Fiber Tank Bra