Tranny slack - how much is normal? - Wrist Twisters
 
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post #1 of 16 Old 07-09-2013, 08:43 AM Thread Starter
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Tranny slack - how much is normal?

I just put new tires on and while the bike was on the jacks I put the trans in 6th and found I have 2 or 3 inches of free play at the rear tire. Everything from the counter shaft back is tight, chain, cush, axle but the front sprocket moves freely a full link up and back and I think I can hear a clacking sound around the clutch basket. The bike runs through the gears fine. Just wondering if this much slack is normal.
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post #2 of 16 Old 07-09-2013, 02:13 PM
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Mind sharing a video of what you are seeing? It could be the lack of sleep, but what you are saying does not compute on this end.

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post #3 of 16 Old 07-09-2013, 02:22 PM
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+1 on video.

What made you decide to test slack in this fashion? Or test slack at all?

I put mine in 1st at a slight hill to park and it rolls forward about 2-3" before it locks. So...

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post #4 of 16 Old 07-09-2013, 02:43 PM
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Curious here, how many miles? first 919 transmission problem?! I hope not

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post #5 of 16 Old 07-09-2013, 02:49 PM
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Quote:
Originally Posted by boogunoogun View Post
Curious here, how many miles? first 919 transmission problem?! I hope not
Nah, I already experienced a transmission problem on my first 919 due to someone tinkering with the internals (for drag racing I suspect), confirmed by a Honda dealership. Result: Catastrophic failure.

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post #6 of 16 Old 07-09-2013, 04:11 PM
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He is talking about the inherent slop in the transmission not chain slack..

To ken that amount of slop sounds spot on to what mine is don't worry about it

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post #7 of 16 Old 07-09-2013, 05:58 PM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
He is talking about the inherent slop in the transmission not chain slack..

To ken that amount of slop sounds spot on to what mine is don't worry about it
Ok, I feel better. I was on a test ride around the neighborhood a after mounting new tires and coasting in 3rd or 4th gear at low speed when the "slack" became apparent with a clacking sound around the right side cover. Maybe I had just never noticed it before - maybe I've never coasted at 10mph in 4th before. Anyway, I'll take a video and post it.
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post #8 of 16 Old 07-09-2013, 07:15 PM Thread Starter
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I took her for another test ride and decelerated to idle in the lower gears and the problem persisted. This is definitely something new.

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I have to drive to Houston in the morning on business so I'll trailer the bike to a friend who owns a motorcycle/atv shop. Right now I'm going to close the garage door and pour myself a scotch.
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post #9 of 16 Old 07-09-2013, 07:42 PM
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I had my wheel off for a new tire and checked mine. Same thing, in 6th gear. Hopefully I don't have a noise when I put mine back together...:/ could it just be you noticed it and now it seems like it was never there? I know I've done that many times before, usually after working on something. I found more and more the best motto is KISS!
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post #10 of 16 Old 07-09-2013, 08:13 PM Thread Starter
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Thanks badmoon. What year is yours and how many miles are on the clock?
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post #11 of 16 Old 07-09-2013, 08:14 PM
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2007, and just over 9000, 4000 of which happened in the last 2 months, so I don't think I should be having any issues (hopefully)

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post #12 of 16 Old 07-09-2013, 09:16 PM
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919 transmission slack - YouTube

2004 with 33k on the clock...doesn't sound/look to be that much different than yours.

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post #13 of 16 Old 07-09-2013, 09:40 PM
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honestly ken... its 100% normal, mine with 22k on the clock does the exact same thing. I wouldnt worry about it, just ride the sucker. As long as she shifts good and doesnt pop out of gears there is NO POINT to take her to a shop and split cases.

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post #14 of 16 Old 07-10-2013, 05:53 AM Thread Starter
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Quote:
Originally Posted by nd4spdbh View Post
honestly ken... its 100% normal, mine with 22k on the clock does the exact same thing. I wouldnt worry about it, just ride the sucker. As long as she shifts good and doesnt pop out of gears there is NO POINT to take her to a shop and split cases.
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post #15 of 16 Old 07-10-2013, 06:13 AM
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Quote:
Originally Posted by nd4spdbh View Post
honestly ken... its 100% normal, mine with 22k on the clock does the exact same thing. I wouldnt worry about it, just ride the sucker. As long as she shifts good and doesnt pop out of gears there is NO POINT to take her to a shop and split cases.
+1 for ND4. The tranny back lash is due to all the splines, gear meshes, and dog clutches in the system. If the system were tight you would not be able to shift. As the system wears it will get more lash but that should not be a problem.
I wonder if this wear would accelerate w/ gear changes without the clutch. Probably just depends on the quality of the shift.

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post #16 of 16 Old 07-11-2013, 05:15 PM
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Perfectly normal.
It is called total, or cumulative backlash.
It's the summation of all the clearances all the way through the system right back to the engine crankshaft.
In the transmission, it's both gear lash and drive dogs and slots lash that comes into play.
(Not all the power is transmitted buy gear meshes alone.)
Bearing clearances should not be a "feelable" factor.
In this case, the total system is the output shaft back to the crankshaft.
In an older design with primary chain drive, you'd pick up on that also, as in more total lash.
Without the internal clearances that cause the degree of total backlash you are feeling, the transmission would be un-shiftable.

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