As a decimal number, this ratio now becomes 0.3 (15 / 50 = 0.3). In other words, the higher the ratio, the lower the range of gears OR the more suitable the bike will be for slower speeds. Most people just change to a front 15T sprocket. Here is the XS650 tach drive gear: It's a 5 tooth and looks like quite a common worm gear, I don't know the teeth and hence the ratio of the gear that it mates with, but if I should find that out I could calculate what tooth to uprate to to get it to 4:1 hopefully. The Changes in Real Terms By changing the 4L60Es gear ratios to match a rear axle ratio of 3.73:1, with a 2.84 first and 1.55 second, you get a final drive ratio relatively close to 10:1 at first (specifically 10.59:1). The Yamaha V-Star 650 Custom is a classic cruiser built with comfort in and practicality in mind. Simple, just divide your rear cog size from your front chainring size. 1- Choose Your Bike: The gearing fields will automatically change for you : Virago 535 V-Star 650 V-Star 1100 V-Star 1300 R-Star 1600 : 2- Enter RPM or speed into green cells. Also take a look at our complete bicycle gear ratio chart below to see how your size compares to other gearing options. So as you can see, before the change the ratio as a decimal number was 0.33, after the change the gearing has been lowered to 0.3. The gear positions are shown in the il- EAU16680 To start out and accelerate lustration. So 10T:50T will result in a 1:5.00 ratio (1 tooth for every 5 teeth on the big gear). 3- … The 15-tooth front sprocket and 47-tooth rear sprocket combine to yield a 3.13:1 gear ratio; changing the front sprocket to a 16-tooth unit would yield a gear ratio of 2.94:1 which I hoped would produce a little more relaxed touring speed without completely destroying the … SOURCE: I'm trying to change the speedometer light on my Yamaha VStar Perusal of a parts manual shows the bulbs to be in sockets with wires hooked to them which press into the outer back of the speedometer head, remove the offending socket (the one on the top, the other 4 are the function lamps I previously mentioned) by gently pulling it outward, the bulb will slide out … If you know their numbers, just input them below and we’ll calculate it automatically for you! 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