i need answers to tranny problem - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 10 (permalink) Old 09-20-2006, 11:27 PM Thread Starter
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i need answers to tranny problem

i was going down the highway and when i shift gears it seemed like it got stuck inbetween gears or it just wouldn't catch the next gear. so i down shifted and it caught. than i went back up and it was fine. what can it be.


thanks for any replies
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post #2 of 10 (permalink) Old 09-20-2006, 11:30 PM
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i was going down the highway and when i shift gears it seemed like it got stuck inbetween gears or it just wouldn't catch the next gear. so i down shifted and it caught. than i went back up and it was fine. what can it be.


thanks for any replies
Clutch? Maybe your tranny fluid is low or needs to be changed? Probably should be posted in tech thread?
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post #3 of 10 (permalink) Old 09-21-2006, 08:26 AM
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it would also depend on the bike, the conditions, etc...my 06 250 Ninja did the same thing, even after i broke it in, it was just a matter of catching the gear dead on...dont know why tho...
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post #4 of 10 (permalink) Old 09-21-2006, 08:39 AM
 
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Welcome to the world of motorcycle trannys...

My F4i does that ocassionally...usually between 4th and 5th...when I am accelerating rapidly...

Also, My F4i will jam if you come off the highway at speed, come to a stop, and try to downshift from 6th to 1st. I have to pop the clutch, down shift, pop the clutch...all the way to first.
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post #5 of 10 (permalink) Old 09-21-2006, 08:42 AM
 
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I'm assuming from your profile that the bike in question is an '01 YZF600, Yes? I'm also assuming that this has happened multiple times, Yes? I'm also assuming that this is the 5 to 6th gear upshift, Yes? you did not mention how many miles are on the bike, or if you have dropped it; also, have you done any speedshifting, high RPM launches, or dragstarts, along with clutch wheelies (you know, rev the piss out of it and dump the clutch to bring the front up)...all these can have a deliterious effect on trannys.

Always start with the basics....

A. Is your CHAIN ADJUSTED properly? This is the single commonest cause of poor shifting. Your bike is finding a "false neutral", meaning that the shifting drum and/or shift pawls are not indexing to the next detent completely....too much slop in the drivetrain from a mis-adjusted chain can make this occur.

B. Is your clutch adjusted properly? A dragging clutch can cause mis-indexing.

C. Have you changed the oil in the last 30 years? Your bike shares the same oil used in the engine with your tranny, and your clutch runs in a bath of it....if it's old or burnt, any number of ills can result....also using regular automotive oil (especially with moly in it) can cause a number of clutch and tranny ills....use GOOD motorcycle oil...there is a difference.

D. If you've taken care of all of these...then it can be anything from a sloppy shift detent mechanism (a ball and spring that causes the shift drum to lock into place each time you shift) to a worn and slipping clutch, to bent or broken shift forks, chipped or gouged gear dogs, or other more serious ills, usually caused by droppage, abuse, or high milage, and a teardown is in order.

I base all this on my ownership of a 2000 model 600R; always ran and shifted perfectly, although was very sensitive to chain condition and adjustment.



Aways check the cheap/easy stuff first.

Last edited by oldetymebiker; 09-21-2006 at 08:46 AM.
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post #6 of 10 (permalink) Old 09-21-2006, 09:49 AM
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False neutral?
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post #7 of 10 (permalink) Old 09-21-2006, 10:03 AM
 
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Originally Posted by oldetymebiker View Post
Aways check the cheap/easy stuff first.


BUT.... also, don't rule out user error...
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post #8 of 10 (permalink) Old 09-21-2006, 10:28 AM
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Quote:
Originally Posted by richrom2 View Post
i was going down the highway and when i shift gears it seemed like it got stuck inbetween gears or it just wouldn't catch the next gear. so i down shifted and it caught. than i went back up and it was fine. what can it be.


thanks for any replies
My bike did that when I switched out the rearsets and the shift rod placement wasn't the same. The place that I had originally put it wouldn't catch gears, I had to put it on the rearstand and mess around until it started to catch normally. It took like 30min to do. Your rod to your clutch may have gotten stripped causing that issue.
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post #9 of 10 (permalink) Old 09-23-2006, 09:28 AM
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Moved to tech section with modified title...




-Chris
aka Gas Man



Was: 2002 Kaw ZX-9R
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is me till the
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post #10 of 10 (permalink) Old 09-23-2006, 12:16 PM
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ounds like false neutral but not enough info to be 100%
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