a quick question about rev-matching. when i downshift, i usually give a little extra throttle to smooth things out, but i wouldn't say that i perfectly match the revs on the downshift by any means. i definitely let the clutch out slowly enough to avoid locking the rear though.
how good/bad is what i do, and how precise are pros when they rev-match?
The pros are dead-on accurate when they do it, of course, that's what they do for a living so.... They also have slipper clutches now that really negates the need for perfection, but I'd bet they can still do it, dead-on, every time. Having said that...
It's good to learn the proper technique, and it is a bit complicated and takes a lot of practice to get it right - especially at higher revs.
Here's how it goes, step by step:
1) Place foot on gear lever, and preload your downshift with a bit of pressure
2) Simultaneously 'stab' the clutch (with the shifter pre-loaded it will fall into the lower gear) and blip the throttle.
By 'stab' the clutch I mean you just flick it in an inch or so with your left hand. No need to pull it all the way to grip - a little flick is all you need. The clutch stab and throttle blip should be on fluid motion. It happens really fast and this is why it takes so much practice to get the timing precise. You also need to get a feel for how much throttle blip you need at different RPMs.
It takes practice, so use a parking lot or quiet road to practice on. Don't get discouraged, it takes a while to get this right, but when you do your downshifts will be way smoother. It's worth the effort.
I would recommend you learn to upshift with the clutch stab/throttle off first to get a feel for just how little clutch and throttle input is required to shift gears. To do this you simply:
1) Slide your toe under the shifter and apply a bit of up pressure to pre-load your upshift
2) simultaneously 'stab' the clutch and go from 50% throttle to 25% throttle back to 50% throttle.
The bike will smoothly snick into the next higher gear. When you are doing this at Wide Open Throttle there is no need to use the clutch at all. Just pre-load your shifter and rotate the throttle from 100% - 75% - 100% and it will smoothly snick into the next higher gear with little or no loss in acceleration. Don't do this until you are fluid with the regular riding motion as things are happening much faster at WOT and can cause small wheelies or minor traction loss at the rear tire if you get the timing wrong. Nothing to be afraid of, but you do need to be aware that it can happen...
Again: Practice, Practice, Practice...