5th - 6th gear change issue - Wrist Twisters
 
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post #1 of 15 Old 04-07-2010, 03:54 AM Thread Starter
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5th - 6th gear change issue

Sometimes I have a problem changing from 5th to 6th gear. At times the bike stays in 5th gear and very occasionally hits a false neutral between the gears.
The problem seems more likely to happen when not accelerating or when changing at lowish revs. Loading the gear lever before changing, changing while revving higher, or changing gear without using the clutch results in perfect changes. Does anyone else have this problem ? (All other gears are OK)
Phil

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post #2 of 15 Old 04-07-2010, 06:37 AM
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Mine sometimes does this, I thought it was because it's had a sheltered life (<9000km since new in December 2006).

FWIW it's getting less frequent the longer I ride the bike. It also sometimes pops out out 6th and into a false neutral in-between 5th and 6th...but again, not so frequent now.

Mick

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post #3 of 15 Old 04-07-2010, 07:25 AM
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Any time I have problems with mine not wanting to shift, it's because I'm being a pansy and not putting enough throw or pressure into the shift with my foot.

The only odd thing I've ever noticed about shifting is that occasionally, it will not down shift while coasting with the clutch pulled in. I'm sure it's bad form or bad practice but I noticed it.

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post #4 of 15 Old 04-07-2010, 07:31 AM
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The false neutral between 5th and 6th is a common issue. Experienced it myself a few times on my '03. It's been discussed a lot around here.

Like cmurphy said, a good remedy seems to be making sure to use a good firm foot motion when shifting. Sometimes when I try to shift quickly I just barely move my foot and don't realize it. And that results in !!!

The problem does seem to get less frequent as the mileage goes up.

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post #5 of 15 Old 04-07-2010, 07:47 AM
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Also some problems when shifting are not letting the gearlever travel back to its normal place...so get you foot out of the way!

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post #6 of 15 Old 04-07-2010, 01:03 PM
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I found the problem to occur when the oil was hot, and the problem was diminished when I changed to Mobil 1 but that did not cure it completely.
I now see it as a rider induced problem, and notice it is related to how sharply one is shifting.
My theory is this.
The 919 is a very torquey and higher rotational mass engine. If upshifting in cruise mode at low throttle openings and only doing partial declutching at the lever, and the oil is hot, it seems to me that there is enough torque transmission through the clutch that the gearbox does not "unload" to permit a shift. At low throttle positions, backing the throttle off doesn't make as much difference as it does a WOT or really on the boil.

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post #7 of 15 Old 04-07-2010, 02:42 PM
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Quote:
Originally Posted by PhilS View Post
Loading the gear lever before changing, changing while revving higher, or changing gear without using the clutch results in perfect changes. Does anyone else have this problem ? (All other gears are OK)
Phil
Isn't it great when a question contains the answer?

The 919 trans is lifted more or less directly from the original CBR900, which is, of course, designed for racing. As such it rewards agressive gear changes and really punishes namby pamby dabs at the shift lever with incomplete shifts, bounceback, and false neutrals. You don't have to ride it as if you are on the white flag lap with Rossi breathing down you neck, but if you shift as if that was happening I can practically guarantee no more shifting problems.

BTW, I never use the clutch to upshift regardless of the revs, and in 6 years and 80,000 miles the number of 5-6 shifts I have missed is exactly zero.

Rob

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post #8 of 15 Old 04-07-2010, 03:34 PM
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Quote:
Originally Posted by cmurphy84 View Post
Any time I have problems with mine not wanting to shift, it's because I'm being a pansy and not putting enough throw or pressure into the shift with my foot.

The only odd thing I've ever noticed about shifting is that occasionally, it will not down shift while coasting with the clutch pulled in. I'm sure it's bad form or bad practice but I noticed it.
+1 on the downshifting, anyone have any thoughts on this?

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post #9 of 15 Old 04-07-2010, 03:43 PM
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I've had this happen, too. My solution is to try not put myself in that position and shift properly letting the clutch out between gears. it only jams up when I get hurried. it doesn't seem to like downshifting multiple gears on one clutch pull.

Well, fire the engines! Spur this iron space-pony on!

"The Shadow"
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post #10 of 15 Old 04-07-2010, 04:13 PM
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I had the same problem with downshifts, whenever i stop too fast at a red light and don't have time to go through all the gears while the bike is still rolling

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post #11 of 15 Old 04-07-2010, 04:57 PM
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post #12 of 15 Old 04-07-2010, 06:31 PM
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I've noticed the same downshifting problem on a few occasions. I'd really like to hear any one's solution, sometimes after a quick stop it's necessary to get going quickly again too (and sometimes it's just embarrassing!)

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post #13 of 15 Old 04-09-2010, 10:00 PM
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I too have a problem hitting a false neutral between 5th and 6th. Doesn't happen very often, but, enough that I notice it. Bike has 10,000km on it, had it since new, noticed the false neutral since new. Only when it was new I had a couple other false neutrals in there if I wasn't aggressive with the shift.

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post #14 of 15 Old 04-11-2010, 07:11 AM
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Quote:
Originally Posted by DoubleJ View Post
I've noticed the same downshifting problem on a few occasions. I'd really like to hear any one's solution, sometimes after a quick stop it's necessary to get going quickly again too (and sometimes it's just embarrassing!)
i've had the same thing happen. what i've noticed if you start down shifting from @ 30 mph(speed of shift depends on how fast you stop) you can go thru 5 shifts with 1 pull if you end in 1st between 10 and 15 mph.

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post #15 of 15 Old 04-11-2010, 09:21 AM
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For those wanting tips:

ALWAYS maintain pressure (up or down) on the shifter until the clutch is fully released.

In exaggerated slow motion:
- Pull in clutch
- Push/pull up/down on shifter DON'T LET OFF!!!!
- Release clutch
- Release shifter.

With above, if gears are not engaging because of misalignment, as soon as the clutch starts to catch thereby moving said misaligned parts, they will engage IFFFF you still have pressure on the shifter.

Once you develop this habit, you'll never miss another shift ever.

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