Chain slack for track - Suzuki GSX-R Motorcycle Forums Gixxer.com

 
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post #1 of 16 (permalink) Old 09-29-2014, 06:04 PM Thread Starter
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Chain slack for track

Everytime I go thru tech inspection they say my chain is too tight. It's usually around the max Suzuki recommended slack (I think around 1.25").

What do you guys run at the track?

My bike is a street and track bike. This year I did about 10 track days, so it does see quite a bit of track use.

Last edited by Menace GSX-R; 09-29-2014 at 06:10 PM.
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post #2 of 16 (permalink) Old 09-29-2014, 07:05 PM
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Re: Chain slack for track

I set it to just barely touch the plastic guard on the bottom of the swingarm.
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post #3 of 16 (permalink) Old 09-29-2014, 07:10 PM
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Re: Chain slack for track

I ran between 1.5"-2.0" of free chain slack on all my race bikes. 1.25" is too tight for sure.
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post #4 of 16 (permalink) Old 10-08-2014, 03:43 AM
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Re: Chain slack for track

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Originally Posted by Anthony D View Post
I ran between 1.5"-2.0" of free chain slack on all my race bikes. 1.25" is too tight for sure.



When working tech inspection at track days, there are always bikes being denied because of the chain too tight.
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post #5 of 16 (permalink) Old 01-13-2015, 12:11 AM
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Re: Chain slack for track

are you guys measuring your slack with the bike loaded (ie you on it) or unloaded (no one sitting on the bike and no balast)?
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post #6 of 16 (permalink) Old 01-13-2015, 04:57 AM
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Re: Chain slack for track

Unloaded
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post #7 of 16 (permalink) Old 01-14-2015, 09:24 PM
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Re: Chain slack for track

thanks mate, that's how i measure mine, however one of my mates measures his loaded....
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post #8 of 16 (permalink) Old 02-04-2015, 01:22 PM
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Re: Chain slack for track

Honestly I don't measure mine. I just make sure it's smiling at me. There's a guy named Greg who once said to me a smiling chain is a happy chain. It should have enough slack to do that.
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post #9 of 16 (permalink) Old 02-04-2015, 03:47 PM
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Re: Chain slack for track

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Originally Posted by surfingsk8r View Post
Honestly I don't measure mine. I just make sure it's smiling at me. There's a guy named Greg who once said to me a smiling chain is a happy chain. It should have enough slack to do that.
should the chain be smiling like this this or ??


lol i never heard the smiling chain motto
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post #10 of 16 (permalink) Old 02-04-2015, 03:49 PM
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Re: Chain slack for track

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Originally Posted by surfingsk8r View Post
Honestly I don't measure mine. I just make sure it's smiling at me. There's a guy named Greg who once said to me a smiling chain is a happy chain. It should have enough slack to do that.
This is bad advice, don't do this.

Always measure chain slack.
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post #11 of 16 (permalink) Old 02-04-2015, 04:47 PM
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Re: Chain slack for track

It's good advice, as long as you have a lick of sense. If you see the bottom of the chain, and it's straight as a yardstick, it's no good. There should be a visible drop to it in the middle. Measuring it is good, but the factory specs are usually just 1/4" or more too tight. Also, when you're measuring it to those factory specs, the end result can vary widely. One factor is how hard you push or pull it during the measurement. Another is that when tightening the axle, it can change the amount of slack by a bunch. Just touching the swingarm when you push it up with a medium firm force is about right.
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post #12 of 16 (permalink) Old 02-04-2015, 06:30 PM
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Re: Chain slack for track

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Originally Posted by Anthony D View Post
This is bad advice, don't do this.

Always measure chain slack.
I can see why you would say that but the assumption is that people know enough to not have it loose enough to be problematic. I have never been turned away at tech over chain tension so it's workin for me.
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post #13 of 16 (permalink) Old 02-04-2015, 06:32 PM
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Re: Chain slack for track

You know what happens when you assume, right? I have failed people at tech for both tight and loose chains.

Why wouldn't you measure it? It takes 5 seconds.
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post #14 of 16 (permalink) Old 02-04-2015, 06:39 PM
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Re: Chain slack for track

Well I concede that you are correct. Making an assumption especially on a public forum is a bad idea.

And you are also right that measuring doesn't take any time really, but in my case I have been doing this long enough to know what's acceptable without holding up a tape or a ruler.

I forget that other people don't have the same level of experience.
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post #15 of 16 (permalink) Old 02-05-2015, 10:03 PM
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Re: Chain slack for track

Quote:
Originally Posted by surfingsk8r View Post
I can see why you would say that but the assumption is that people know enough to not have it loose enough to be problematic.
Common sense is not common. I've turned people away at tech for even dumber things - like not having a drop of fluid in the rear brake system or having spike bolts all over
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post #16 of 16 (permalink) Old 02-06-2015, 12:10 AM
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Re: Chain slack for track

"What do you guys run at the track?"

Just bear in mind that if you have wound on a fair bit of rear preload or have jacked up the rear end; then you will probably have increased the swing arm angle and will need a little more slack than standard.
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