My gear-ratio tank is really dry, please explain the difference

I'll give it a shot. I don't know exactly what you want to know...

note that each transmission has a primary and final reduction in addition to whichever gear is engaged. the engine's power is transmitted through each reduction ratio (primary, selected gear, final) until it reaches the rear wheel.

the numbers that look like this (31/22) are the number of teeth on each of the two meshing gears. to get the gear ratio for that set, simply divide them: 31/22 = 1.409

nomenclature: two gears permanently meshed are called a gearset. the bigger is called the gear, and the smaller is called the pinion.

the ratio is the number of turns the pinion makes for every one turn of the gear. for example, 1.409:1 means the pinion turns 1.409 times for every one turn of the gear.

notice that the ratios get progressively smaller as you go up through the gearbox. that makes sense, since you go faster as you go up through the gears. each gear reduces the engine's rpms less.

so, to compare each manufacturer, you should find the final transmission ratio for each gear. suzuki has already done this (trans. overall ratios). to get those numbers, simply multiply the primary reduction, final reduction, and gear ratio. for example, the first gear overall ratio:

primary x final x 1st = overall

suzuki

1.926 x 2.812 x 2.786 = 15.08

honda

2.111 x 2.625 x 2.666 = 14.77

kawasaki

2.022 x 2.666 x 2.923 = 15.75

now that we have overall ratios, we can say (in first gear) the suzuki engine turns over 15.08 times to turn the rear wheel once, the honda 14.77 times, etc.

in first gear, kawasaki has the highest reduction ratio, or the "lowest" first gear. conclusion? a kawasaki has a slight mechanical advantage in first gear.

simple mathematics.

ps - if you really wanted to, you could calculate how fast the bike would be going at a given rpm in a given gear using these numbers:

rwheel rpm = rpm / overall ratio

rwheel circuference = 2( 3.14 )( rwheel radius in inches )

speed in inches per minute = rwheel rpm( rwheel circumference )

now just convert inches per minute to miles per hour.