Front brake pulsing - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 28 (permalink) Old 08-27-2012, 04:40 PM Thread Starter
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Front brake pulsing

Hey guys I have a new to me 06 RC51. It has a lot of aftermarket mods like twin bros exhaust, pazzo levers, and a bunch of other things. Basically everything you can imagine.

I have noticed while trying to walk my bike backwards that it seems as if the front brake is pulsing and I think it may do it more often when I hit the throttle but I can't be sure.

Basically I'll walk my bike backwards in neutral to back out from my carport and the tire's will rotate a few times and then I'll hear a popping noise which I'll assume is my brakes grabbing and then I feel resistance from the bike to go backwards.

Does anyone know what my problem could be? Please ask for more details if needed I would like to figure this out soon!
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post #2 of 28 (permalink) Old 08-27-2012, 05:09 PM Thread Starter
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Actually it isn't the front brake it is coming from the rear and it does it when the bike is off too. It's a popping noise that sounds like it's coming from the chain or sprockets maybe? When I back up it feels like it's tightening up and popping and then it just lets loose and starts again with the tightening.

Location seems like maybe the front sprocket but I haven't taken a look yet because I still need to figure out how to get access to it

Last edited by sircrisp; 08-27-2012 at 05:16 PM.
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post #3 of 28 (permalink) Old 08-27-2012, 05:20 PM
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I would say check the teeth on the sprockets they maybe fish hooked. Hooked sprocket teeth make sounds like the plucking of guitar strings.

Most likely what you are hearing. Get it up on a rear stand and spin the rear wheel. If you see the chain jumping around probably time to replace the set.



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post #4 of 28 (permalink) Old 08-27-2012, 05:27 PM Thread Starter
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I'll post a video shortly to see if it can maybe help pinpoint the problem.
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post #5 of 28 (permalink) Old 08-27-2012, 05:31 PM Thread Starter
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Heres the vid. IMO the rear sprocket looks fine but I don't have anyway to lift the bike currently to spin the tire.

Here is the video of the popping

http://www.youtube.com/watch?v=i86LN...ature=youtu.be

The chain seems a bit too snug, could adding slack remedy my problem?

Last edited by sircrisp; 08-27-2012 at 05:45 PM.
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post #6 of 28 (permalink) Old 08-27-2012, 05:53 PM
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You deffinitely need a new chain & sprockets set. Your sprocket's teeth are very worn out and your chain's links are jammed appart from rust.
Looks like the bike was in a salty environment for some time.
Since you remove the rear wheel, better check the sprocket carrier's bearing as well as the wheel's too.


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post #7 of 28 (permalink) Old 08-27-2012, 06:26 PM
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Quote:
Originally Posted by sircrisp View Post
Heres the vid. IMO the rear sprocket looks fine but I don't have anyway to lift the bike currently to spin the tire.

Here is the video of the popping

http://www.youtube.com/watch?v=i86LN...ature=youtu.be

The chain seems a bit too snug, could adding slack remedy my problem?
I would replace the chain and sprockets, the wheel may be out of alinement and with a bad chain you will have loose spots and tight spots, pick yourself up a kit with the chain and sprockets, its cheaper that way. good luck

"...Loctite -- or kiss your nuts goodbye..."
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post #8 of 28 (permalink) Old 08-27-2012, 06:29 PM
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Also you should get the SP1-SP2 Factory Service Manual
Check out at pages 58-59-60. It's all there.





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post #9 of 28 (permalink) Old 08-27-2012, 06:32 PM Thread Starter
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Well nuts, I looked over the chain and sprocket too before I bought it but I guess the lightening wasn't good enough to see the rust.

I am broke atm due to needing to purchase books for school. How much would a kit cost?

If I recall correctly it has -1 on the front sprocket and +3 on the rear. I've never messed with sprockets and chains before, always kept my stuff stock but I would like to replace it as he has it. Can anyone recommend a kit for me? I don't even know what length chain I would need.

pic related: it's my damn chain
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post #10 of 28 (permalink) Old 08-27-2012, 06:47 PM Thread Starter
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Also I checked the factory manual and it says the chain slack should be an inch while mine has almost none at all. Would adding some slack allow me to ride it until I'm able to swap in the new hardware?
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