matt.c
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 posted on 20/5/06 at 09:32 PM |
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GEAR SHIFTING
Hi all, been speaking to a couple of bikers today about gear changing and changing up gears with no clutch, they both said that they use there clutch
when up shifting.
My question is that if they use the clutch, how can BEC's not use them and do the gearboxes last very long when not using clutches?
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zxrlocost
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| posted on 20/5/06 at 09:44 PM |
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hope this explains
with good practice it is perfectly safe to Upshift
therefore you can up shift on a BEC clutchless
BUT
the problem lies in the technique
Bad technique= quicker wear in theory
mostly though even abused bikes go on and on and on
I do
and it makes for a very smooth change if you get it right
accel off
upshift
accel on
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JoelP
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| posted on 20/5/06 at 10:02 PM |
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are we all talking about the same thing by upshifting? 1>6 is clutchless, 6>1 you would use the clutch. I believe the gearboxes prefer fast and
clutchless on the way up the box.
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zxrlocost
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| posted on 20/5/06 at 10:06 PM |
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well Im talking about the same as you
no clutch on the way up
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mark chandler
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| posted on 20/5/06 at 10:07 PM |
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If you turn the output sprocket on a bike engine and work through the gears you can feel the way the gears neatly drop into the next cog.
Also as the gearboxes are close ratio and the reciprocating weight of the engine is low you are not forcing anything.
As an aside You can buy full power powershift systems for bikes, essentially these are solenoids that punch the gearbox up a notch, while knocking the
ignition off during the transition. Bike technology is far ahead of cars.
I always use the clutch coming down, just throttle back and nudge the gears up on my blade.
Regards Mark
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Mezzz
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| posted on 20/5/06 at 10:11 PM |
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I get the whole up shift business
But how do you do a good down shift?
Do you hold the clutch in whilst You pull the leaver or just stab it?
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gary gsx
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| posted on 20/5/06 at 10:20 PM |
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I shift up on my bike without clutch easy when you get the hang of it
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zxrlocost
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| posted on 20/5/06 at 10:21 PM |
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yes pull clutch in and drop down gear
never do clutchless downshifts they are bad
its all about engine speed and revs etc and forcing it upon the gearbox
ie a bit like if you rammed a car gearbox into first at 20mph speed and let the clutch out
thats the stress anyway
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Jubal
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| posted on 20/5/06 at 10:23 PM |
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Heel and toe when going for it seems to give good downshifts. My Indy pedals are crap for heel 'n' toe though. To roll my foot onto the
throttle requires me to lift it uncomfortably and compromises the braking.
I'm in the process of fitting a trickshifter with the downshift option to avoid the need for using the clutch on the way down. Interested to see
how the box holds up under the abuse
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OX
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| posted on 20/5/06 at 11:10 PM |
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mezz ,i wouldnt worry to much about it, with in an hour you'll be going up and down the gears no problem,if you think about it to much rather
than just doing it you'll get no where fast.
for the overtake ,,clutch in ,down the gear,then as your bringing the clutch up ease/stick your foot down on the throttle,it all happens in less than
a second.
roundabouts i dont worry about the gears untill iv done most of the braking and then whilst still on the brakes its just clutch in and go down the
gears a couple at a time(normaly aim for 3rd depending on traffic) then let the clutch out,you should of done most the braking and be at a speed where
you wont have to worry about being in to low a gear and revving the tits of it.if you manage to get first gear at 20 mph watch the throttle as it
becomes a hair trigger  .
its hard to explain as it comes so natural
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