Chain slack question - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 12 (permalink) Old 06-17-2013, 12:13 PM Thread Starter
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Chain slack question

I was wondering should I change my sprockets and chain ? The sprockets both still have the "u" between the sprockets not the famous "v" wear and also there is number on the rear sprocket idk if its a part # or what . The chain says DID on the links , Click image for larger version

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post #2 of 12 (permalink) Old 06-17-2013, 12:31 PM
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Can tell much from the photo on what condition your chain and sprockets are.

If you're developing a tight spot in the chain, or the chain is requiring frequent adjustments, then it may be time to replace the set.

Also if your sprocket teeth are showing undercutting by the chain in sort of hooked shape, then it's time.

For the most part, it's the chain that wears out the sprockets.
As the bushings in the chain rollers wear, the roller's center to center distance increases, and that puts more pressure on the sides of the sprocket teeth and starts the wear process.
That's why both chain and sprockets must be replaced as a set.

By the look of the photo, it appears your may running a Vortex sprocket.
Vortex often has the sprocket type and tooth number near the sprocket hub or spoke.
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post #3 of 12 (permalink) Old 06-17-2013, 12:47 PM
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An extreme example of a bad sprocket on top of a brand new one. This one was allowing the chain to skip. No Bueno!




You should have about 25 -30mm of slack in your chain.
Here I have 28mm. I used the center of the pin as reference.
I measure the bottom part - equal distance from front to back.




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post #4 of 12 (permalink) Old 06-17-2013, 12:57 PM Thread Starter
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@jondog,. I checked the slack it still 28mm , the teeth on my sprocket looks like your pik , but the sprocket in the back,. Definitely , not that that horrible front one ... I'm leaning towards a pc3 because reading everywhere on here they say that will take away the low RPM/speeds jerking but I'm mostly on the highway 80% of the time , and I want a reputable tuner to dyno the bike as I only have yoshi slipons and k&n. filters ,..


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post #5 of 12 (permalink) Old 06-18-2013, 01:53 PM
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if your in the middle of the chain, between front and back sprokets, when i lift my chain it can touch the underside of the swingarm!

do i need to tighten it or am i measuring it wrong?

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post #6 of 12 (permalink) Old 06-19-2013, 01:37 PM
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Quote:
Originally Posted by Polarbear View Post
if your in the middle of the chain, between front and back sprokets, when i lift my chain it can touch the underside of the swingarm!

do i need to tighten it or am i measuring it wrong?
didnt mean to hijack the thread or anything but i do need an answ to this, cos ive got a big ride out on fri and would like to sort this b4 i go. dont wanna tighten it if it doesnt need it man

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post #7 of 12 (permalink) Old 06-19-2013, 02:14 PM
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Quote:
Originally Posted by Polarbear View Post
didnt mean to hijack the thread or anything but i do need an answ to this, cos ive got a big ride out on fri and would like to sort this b4 i go. dont wanna tighten it if it doesnt need it man
Tightening your chain is so easy, don't hesitate to set it right. All you need is a torque wrench with a big socket (can't remember, something like a 32 mm) and two small open end wrenches (12 mm and 10 mm I think).

And when I set mine recently myself, when I lift the middle of the chain it does touch the bottom of the swing arm (well, the protective plate under there anyway).

And when my dealer just installed my new tires yesterday, they had to re-set the chain slack of course, and it's exactly the same as when I set it: It does touch the bottom of the swing arm when you lift it.

The chain is supposed to move up & down a total of 1.0 - 1.4 inches from bottom (just sitting there) and top (so basically against the bottom of the swing arm)

Good luck!

Last edited by extrapolator; 06-19-2013 at 02:16 PM.
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post #8 of 12 (permalink) Old 06-19-2013, 02:27 PM
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cool, sounds like mine is prob about right then

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post #9 of 12 (permalink) Old 06-19-2013, 02:30 PM
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I've always done both sprokets and chain together, got the thing on the stand anyway so.

Duct tape can't fix stupid...but it sure helps muffle the sound
'03 SP2, '09 GL1800
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post #10 of 12 (permalink) Old 06-19-2013, 03:32 PM
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I've always done both sprokets and chain together, got the thing on the stand anyway so.
FYI - The manual says to set your chain slack while the bike is on the side stand.
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