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Old 11-24-2008, 02:57 PM   #1
cobra281
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Upshifting: To Clutch or Not To Clutch?

Well Saturday was my first trackday and I am totally hooked, but that is for another thread.

I was told by an instructor that I could upshift without using the clutch. This person said to just roll off the throttle which will put some "slack" in your transmission and apply pressure on the shift lever to upshift.

They stated that because I have a close ratio transmission that this will be fine and not cause any damage.

I was talking to a friend of mine who is very knowledgable about bikes and they said that unless one had a quickshifter (which requires a PC and Ignition Module) you need to use the clutch to prevent damage to the transmission.

What does everyone else do? Any other opinions?

Thanks in advance.
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Old 11-24-2008, 03:52 PM   #2
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I don't use the clutch to upshift. Only for downshifting.
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Old 11-24-2008, 03:58 PM   #3
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clutch? whats that? Do they come on all bikes?
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Old 11-24-2008, 04:03 PM   #4
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I've heard stories both ways - but sometimes I have upticked my throttle to make a downshift slip into place with no clutch... certainly upshifts are easy enough too.... prolly different in racing circumstances tho....
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Old 11-24-2008, 04:06 PM   #5
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up shift good down shift bad.

yes there is a little more wear on the corners of the gear dogs but not enough to worry about on a race bike.
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Old 11-24-2008, 04:07 PM   #6
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it won't hurt the tranny. What does a quickshifter + ignition module do? It chops the throttle (via electronics) momentarily while shifting. Once you get the timing down.....you're doing the EXACT SAME THING the quickshifter is doing.
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Old 11-24-2008, 04:09 PM   #7
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Quote:
Originally Posted by po-po 5.0 View Post
it won't hurt the tranny. What does a quickshifter + ignition module do? It chops the throttle (via electronics) momentarily while shifting. Once you get the timing down.....you're doing the EXACT SAME THING the quickshifter is doing.

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Old 11-24-2008, 04:09 PM   #8
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LOL,
clutch for up shifting?
maybe out of 1st,its not that they are close-ratio.
they are synchronized(someone corerect me if im wrong),when one gear is engaged the next is already lined up.
i personally dont clutch up or down.there is "slack" both up and down when one shifts.thats not to say just stomp on the lever,there is a technic......which i dont know how to explain any better than the instructor did.
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Old 11-24-2008, 04:10 PM   #9
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i dunno how to use the clutch :(
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Old 11-24-2008, 04:32 PM   #10
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Close ratio is only half the point....constant mesh is the other half
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Old 11-24-2008, 04:35 PM   #11
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What clutch?
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Old 11-24-2008, 04:40 PM   #12
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Old 11-24-2008, 04:50 PM   #13
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I dont use the clutch on the up shift. Now I have a quick shifter and its flawless even without letting out of the gas.
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Old 11-24-2008, 05:27 PM   #14
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Quote:
Originally Posted by rc51eviltwin View Post
LOL,
clutch for up shifting?
maybe out of 1st,its not that they are close-ratio.
they are synchronized(someone corerect me if im wrong),when one gear is engaged the next is already lined up.
i personally dont clutch up or down.there is "slack" both up and down when one shifts.thats not to say just stomp on the lever,there is a technic......which i dont know how to explain any better than the instructor did.
Actually, motorcycles don't have "synchronizers" in the automotive sense. That being said we DO have "constant mesh" tranmissions. All the different ratios are locked to each other at all times. When you shift, all you're doing is essentially locking a particular ratio to the output shaft.





Crappy explanation, there's a website called www.howstuffworks.com that has an article with visual aids that makes more sense.
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Old 11-24-2008, 05:30 PM   #15
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clutchless upshifts for me as well
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Old 11-24-2008, 05:30 PM   #16
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Yep, in agreement with everybody else. A bit of pressure under the shift lever and momentarily ease up on the gas and she'll shift like butter with no clutch.

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Old 11-25-2008, 09:21 AM   #17
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yea when you let up off the throttle i believe the clutching plates in the transmission kinda grab onto eachother to allow them to attain the same speed between gears an allows you to shift into the next gear. im no motorcycle transmission guy but i know exactly how a car transmission works. when you have it in 3rd gear on a car and you let off the gas and push the shifter to the next gear (4th) it will slip out and try to go into the next gear without the clutch. and you can clutchless upshift with a car full throttle too, you just have to have perfect timing. the constant mesh just makes it super easy on a bike.
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Old 11-25-2008, 09:24 AM   #18
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yup...clutchless up shifts all the time for me too, even on the streets.

Havent learned the art of clutchless downshifts yet tho.
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Old 11-25-2008, 09:25 AM   #19
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i use it ... but then again i dont do track days
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Old 11-25-2008, 09:35 AM   #20
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Thank you for all of the replies.
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