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My .02 worth - I switched from 17 to 18 tooth countershaft sprocket. Bike got approx 50mpg overall with the 17T. It got about 50mpg with the 18. I switched back to 17T.
You should install it and draw your own conclusions. Many of us riding 790cc engines with slightly more radical cam timing than the 865cc engines prefer the 17T, since it lets the bike run easily in the higher rpm range. However, there are others that prefer the slower lope of the engine with the 18 tooth. As for me, I like to hear her wind a bit higher, and work a bit less hard.
If I change my cam timing to make it more like the 865, I may consider adding one tooth (back to 18) or maybe less radical, drop one tooth on the rear sprocket. I'll decide that in the next couple of weeks, when I pull cams to swap out a few shims.
BTW - I still plan to document (dyno) the stock cam timing and modified timing.
Bob
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2003 T100 (790cc) Lucifer Org and Silv: 122/42 jets, TORs, 17T, UNI filter, no AI, Polaris bellmouth, Metzeler ME880 tires, Progressive 440 shocks (105/150 springs),11-1126 fork springs, gaiters, MotoTwin low bars, 6024 lamp, htd grips, 12v outlet.
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