Rev mathing question

[cyrusyn]

Bike : 2000 GS500E
Odometer: 30K


Does GS500E's tranny come with synchronizers? I was wondering whether I should do a double clutching or not when I rev-match while downshifting.

[yamahonkawazuki]

yes they have synchros. no need to double clutch or rev match. unless, 1 you can do it successfully, or two there is a valid need for it. but yes theyve got em, and yes you can, if you wish to do so

[cyrusyn]

I do have a valid reason of needing to practice rev-matching. Thank you very much for your reply.

[Beelzeboss]

Forgive me if this seems a stupid question, but how do you double clutch on a motorbike? You can't go into neutral, so how does it work? I always double clutch my car.
I understand rev matching, and think it's a good idea.

[ohgood]

Bike : 2000 GS500E
Odometer: 30K


Does GS500E's tranny come with synchronizers? I was wondering whether I should do a double clutching or not when I rev-match while downshifting.

rev-matching.. double clutching... hmm... there is a host of mis-conceptions of what things mean, so i'll skip all of that...


you -can- upshift clutchless, with no worries. as far as matching revs, if you have to think about it, you're doing it wrong. accelerate, light pressure on the shifter (upshifts only man), slightly ease off the throttle to relieve the drivetrain torque, and it will slip into the next gear. if you're trying to TIME an upshift instead of using gentle shifter pressure, you're doing it wrong. it should be smoother than using the clutch, quiet, and more muscle memory than timing or 'trying'.

downshifting clutchless is a baad idea. it puts stress on things inside that are expensive, and annoying to fix. not to mention the hazards of skidding the rear wheel coming into a turn.

ya dig ?

[ecpreston]

I always double clutch my car.

I have to ask... why? I've never understood why anyone would do this unless the transmission demands it. Rev matching, sure, but that doesn't require double clutching.

[GeeP]

Rev matching on downshifts?  Yes.

Double-clutching?  As previouswly stated, it is impossible.  In addition, motorcycle transmissions rely on a revolution disparity to shift.

The key to smooth upshifts is timing the clutch release and engagement along with preloading the shifter.  Be sure to pull the slack out of your clutch cable and linkage as well, using light finger pressure.   

On downshifts, you should rev-match.  Preload the clutch lever, preload the shifter.  Then, pull the clutch about halfway to the bars, feel the shifter and simultaneously blip the throttle while releasing the clutch.  All these operations have to be done rather quickly.  It takes quite a bit of practice to be smooth.

It's all part of learning how to ride.   

[Weston]

On my bike I actually find clutchless shifting smoother. Downshifting always use the clutch. Sometimes if im feeling lazy, I clutchless shift in my car too. Thats abit trickier though.

[coll0412]

yes they have synchros. no need to double clutch or rev match. unless, 1 you can do it successfully, or two there is a valid need for it. but yes theyve got em, and yes you can, if you wish to do so

Actually a motorcycle transmission doesn't have synchros like a car transmission. The transmission in a motorcycle is what is termed a constant mesh transmission. The input and output gears are always in contanct and you actually engage the output gear to the output shaft via "dogs" on the selector fork.

Here is a link to how motorcycle transmissions work
http://www.gadgetjq.com/transmission.htm

Rev matching will help preserve the life of the dogs, but because of the nature of how these transmissions work, upshifts can be done without the clutch harmlessly. If you are down shifting its a good idea to rev match to save transmission life and prevent the rear tire from skidding if you are braking hard and down shiftting(no slipper clutch on the GS).

Key Ideas:

Clutchless Upshifts when done right=OK
Clutchless Downshifts= Bad Idea

Down shift + rev match +clutch=BEST WAY
down shift+clutch=OKAY

[Beelzeboss]

I have to ask... why? I've never understood why anyone would do this unless the transmission demands it. Rev matching, sure, but that doesn't require double clutching.

On double clutching in the car: smoother, less wear on gearbox synchro's, less clutch wear, AND it sounds awesome.

[ecpreston]

on double clutching in the car: smoother, less wear on gearbox synchro's, less clutch wear, AND it sounds awesome.

I can't speak for the synchros, I suppose you're preventing them from having to do their job if you do it right, so that could lead to reduced wear for them. I mean, if that was the only reason, sure, fine, help yourself. But the "smoother", "less clutch wear", and "sounds awesome" all come from rev matching, not double clutching. You can still rev match with the clutch pushed in. Just splitting hairs here... but with double clutching, aren't you increasing the wear on throwout bearing, fork, clutch hydraulics and such?