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13t is at least 8% reduction in sprocket and chain lives compared to 14t. Best to run the biggest countershaft sprocket you can, then choose a wheel sprocket to provide the final drive ratio you desire. Select a high quality ringed chain to maximize lives of all three components. Lube enough to prevent surface rust and you can reasonably expect 25,000 miles (40,000km) out of a chain and sprocket set. Typically, largest countershaft sprocket that will fit and appropriate chain and wheel sprocket to match will need lube twice while traveling the same distance that will flat wear out smaller sprockets and a cheap chain, sets I've worn out in 5000 miles (8000km).
Chains and sprockets wear to fit each other. A worn one of the three parts, doesn't matter which, and very quickly all 3 will be worn. To maximize chain and sprocket life replace all three parts at the same time.
Anywho, RX3 trans ratios are too close together for an adventure bike that needs to run terrain and highway. Much of the improved powerband width of the 300 kit is simply wasted. Of course, if you want to tweek the stock displacement for more power peak and a narrower powerband the ratios are just about perfect. I have 4 TW200 Yamahas, modified for different purposes, and they have 3 different sets of transmission ratios, so I know how critical trans ratios can be to the overall performance attributes ratios can provide.
Wish I could get tooth counts on all the RX3 trans gears so I can get started on the math to calculate an appropriate set of ratios for a stock engine with the 300 kit for adventure use. Once such an engine is built anyone who rides it will have orgasms from the much improved feel.
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