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Discussion Starter #1
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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Discussion Starter #2 (Edited)
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 :p
 

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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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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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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=i86LN6bNt5o&feature=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
 

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Discussion Starter #9
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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Discussion Starter #10
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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That chain and sprocket is one of the most under lubricated sets I have seen in ages....I know you want to ride but you may want to change those out before just to be safe. $200 and a couple days, you can be on your way again.
 

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Discussion Starter #12
Yeah I've decided to just suck it up and leave the bike parked inside for the next couple weeks :(

I am about to order a kit though, 15 front and 43 rear, 520 chain, I just have one more question. How many links will I need?
 

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Yeah I've decided to just suck it up and leave the bike parked inside for the next couple weeks :(

I am about to order a kit though, 15 front and 43 rear, 520 chain, I just have one more question. How many links will I need?
Buy a 120 link just to be safe and cut it down from there....I run 16/42 and its pretty decent on the launch. I like power wheelies, not stand ups:D
 

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....I run 16/42 and its pretty decent on the launch....
I had that combo for over 2 years and I gotta say it is very good indeed.
However I was amazed of how much better is the 15/39.
Almost the same launch but much much better riding long distances on the highway.
 

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SirCrisp, your dudeness... ;)
That's the tightest dryest chain I've seen.
Borrow or buy a rear stand, loosen your axle, and bring those adjuster bolts in a turn or two. Or three or four. Then at least you'll be able to roll the bike around. That's gotta be putting decent side pull on your output shaft.

There's all kinds of sprocket combinations. I run 15/42. Madbuyer has 16/42.
Makis has 15/39-which seems very close to [email protected]/40.

Not sure why you want to keep the PO's gearing of 15/43. That's deeper than any of the examples I sited, but I've read post of guys who run that too.

Your SP2 is OEM 16/40 with 106 links and a 190/50-17. Your -1+3 will need at least 106, maybe 108 links. What size tire do you have?
 

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Definitely park it...it maybe a couple hundred bucks for chain and sprockets, but that's way cheaper than engine cases.
 

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A Ducati 999R came once in the shop I was working at, with oil leaking and a strange noise from the front drive sprocket.
Result was, due to owner over tighten the chain, the bearing behind the sprocket, on the secondary transmission shaft, had made, it's engine case hub, an oval cause the chain was pulling the shaft hard towards the rear every time the rider hit a bump :eek:
An over tighten chain is never a good thing.
Thankfully Honda's cases are stronger but better leave it parked until you replace the set and adjust it properly.
Nobody's observation is the next most important hazard cause an over tighten chain overheats and snaps resulting an engine cases serious damage.
 

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Discussion Starter #19
I'm still sitting here staring at my bike dying to ride it. I ordered a Bikemaster chain and sprocket kit to save some money, spools and stand because I gave my old ones away with my last bike, D.I.D. chain tool, harbor freight torque wrench, and a digital caliper.

It was all about $300 but I needed the stuff anyways and it would have been $400 at the dealership.

I'll probably replace the carrier bearing in a month or two. I actually rode the bike home which was about 40 miles, I hope it didn't cause any damage.
 

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Discussion Starter #20
I've never replaced a chain before. When I add the new chain, how far back should the tire be? Do I just put it back in and adjust it until the chain is within spec?
 
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