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Buell Forum » 1125R Superbike Board » Archive through July 17, 2013 » Shifting without clutch « Previous Next »

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Cleveland11b
Posted on Monday, June 17, 2013 - 06:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have heard people talk about doing this all the time. is it damaging to the bike to do this, or can you do it all the time. im kinda shocked that you can even do this, goes against what ive always thought a clutch does.
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Froggy
Posted on Monday, June 17, 2013 - 06:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)


quote:

is it damaging to the bike to do this




If done properly, no it is not damaging. The 1125 can easily be clutchless upshifted in the higher gears.


Doing anything improperly can lead to damage, including using the clutch in general. If you "slip" the clutch excessively, it will cause premature excessive wear and will need to be replaced more frequently.
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Cleveland11b
Posted on Monday, June 17, 2013 - 09:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

could you explain the propper way to do it or point me to any resource that might be able to teach me
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Craigg
Posted on Monday, June 17, 2013 - 10:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I only use the clutch to shift from 1st to 2nd. Seems to not clutchless shift as smoothing on the street unless I use the clutch.

On the track I don't use the clutch at all to upshift.


The Proper way is almost the same as shifting with a clutch.

Put slight pressure when you are about to shift to the next gear.

Release the throttle

Press the shifter up

Reapply Throttle.


The reason you would want to do this on the track it reduces the front end from dipping.

(Message edited by CraigG on June 17, 2013)
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99buellx1
Posted on Tuesday, June 18, 2013 - 12:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I don't clutch on upshifts:

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Stevenfrye
Posted on Tuesday, June 18, 2013 - 01:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

great video
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Solson1041
Posted on Tuesday, June 18, 2013 - 08:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

When accelerating, the engine is putting a huge amount of power through the transmission to turn the wheel, when decelerating and engine braking, the tire is pulling back on the transmission and slowing the engine down. You can't shift at either of these points because the transmission is loaded down with power coming from either direction.

When you're riding hard and you snap the throttle shut there's a time where the load on the transmission is zero and it will shift gears as freely as it would with the clutch lever pulled. So if you're moving along and you have a little bit of pressure upwards on the shift lever, when you snap the throttle, the transmission will be load-less and that little bit of pressure will push the lever and you'll shift gears.

You can do a similar thing in a 5-speed car, drive down the road in 3rd or something and have your hand lightly pulling back on the shifter while under acceleration. If you let off the gas quickly, that little bit of pressure will very easily pull the car into neutral, as easy as it would if the clutch were pressed, but it won't come out easily while you're accelerating.

But obviously your car won't go into the next gear because it's not a sequential transmission.
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Hybridmomentspass
Posted on Tuesday, June 18, 2013 - 09:01 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

drag racers been doing it for a LONG time
its fine
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Slaughter
Posted on Tuesday, June 18, 2013 - 09:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Upshift, yes; downshift no.

RPM matching is not as difficult as it'd seem.

I raced with a bunch of stitches and skin graft on my left hand. No grip. Had to start by pulling the clutch with the whole arm. That's when I realized that clutchless upshifting worked just fine but my first attempt at downshifting nearly put me on my head...

It's just important to unload the tranny. IF you FORCE it, your shifting forks are gonna get hurt.
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Jonesgw
Posted on Tuesday, June 18, 2013 - 03:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You guys answered a question of mine from a previous post in another folder however, all great replies and that's what I though. I do all those things for the most part. Letting off the gas just enough to pop it up to the next gear and or down if in the higher gears. Second to first I usually do it also but it depends on the speed I"m going. Feel, all feel..
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Sir_wadsalot
Posted on Wednesday, June 19, 2013 - 12:17 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah the Rotax don't like to do it 1st to 2nd unless you're way up the power band at extra legal speeds....
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Chameleon
Posted on Wednesday, June 19, 2013 - 06:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I find it easy to clutchlessly upshift my 1125R when accelerating at any pace, but downshifting without the clutch is easier when cruising at lower RPMs.

In my car, I shift without the clutch most of the time if I'm just cruising. It's a 1998 Dodge Neon Sport Coupe with a 2.4L Turbo & 5-spd manual transmission swapped in place of the stock 2.0L N/A & 3-spd auto. It has a South Bend stage 2 clutch which is a bit heavy, but the gears and rest of the tranny is stock. Just have to match the revs. I rarely crash the gears.
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Chameleon
Posted on Wednesday, June 19, 2013 - 06:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

BTW, I'm very glad that I learned how to shift up & down without the clutch before needing it the TWO times I completely lost my clutch pressure coming home from long rides. It was due to the early clutch slave actuator piston/seal weep problems...
Made it home both times and the 2nd time my wife was riding as passenger. She only noticed when I had to come to a stop and went from 2nd to Neutral while waiting for the light, then had to kind of duck-walk/-run up to a bit of speed, pop it into 1st, and take off. Was a bit harsh, but it worked.
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Thefleshrocket
Posted on Wednesday, June 19, 2013 - 01:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm good at motorcycle clutchless upshifts and I can upshift/downshift a car without the clutch as well, but I still avoid doing it regularly.

Given how many people claim they clutchless upshift a bunch with no problems, my worries are probably unfounded, but I am concerned that clutchless shifting might put more wear on the shift forks than just using the clutch. Specifically when preloading the shift lever before upshifting.

I probably have no reason to worry, but after having bought two motorcycles that, unbeknownst to me, had worn/damaged shift forks (and having fixed them myself), I prefer to err on the side of caution.
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Dktechguy112
Posted on Saturday, June 22, 2013 - 02:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

10k miles of clutchless upshifting. I took the motor apart and the shift forks were beautiful.
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01fxdx
Posted on Saturday, June 22, 2013 - 08:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ask any road racer, pulling clutch lever and disconnecting rear tire= disaster. You want the engine steering bike with rear tire. Hell, what do you think is going on with the dunk jet quick shift device? Dale walker makes a kit too. These momentarily interrupt ignition to up shift without letting off throttle.
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Chessm
Posted on Thursday, June 27, 2013 - 03:25 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

20K miles on my CR. clutchless upshifts pretty much everytime except 1st to 2nd

thats with trackdays too

no issues here
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