Stock gearing - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 22 (permalink) Old 02-11-2009, 09:25 PM Thread Starter
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Stock gearing

Is stock gearing 16/40?
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post #2 of 22 (permalink) Old 02-11-2009, 10:08 PM
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Yes it is.
And is generally way to high for ordinary use.
A very good compromise is 15/41.
You can take off with little clutch slippage and yet cruise at way over the speed limit with no problem.
Changes the indicated speed by 7 MPH higher than actual.
If you desire accuracy, you can buy a SpeedoHealer that interconnects between your speed sensor output and speedometer to show actual indicated speed.
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post #3 of 22 (permalink) Old 02-11-2009, 11:04 PM
 
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im sorry to jump in out of nowhere do you guys mind explaining to me what are you guys are talking about im new to rc51s
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post #4 of 22 (permalink) Old 02-11-2009, 11:20 PM
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Stock final drive ratio (16T/40T) is set far too high (1st gear good for over 80 MPH).
It requires a lot of clutch slippage to take off from a stop and it doesn't allow the engine to operate in the best power range.
By changing the sprockets to 15 tooth front and 41 tooth rear, the engine requires very little slippage to launch from a stop and yet still allows high speeds.
It allows the engine to better operate in it's power band over all 6 gears.

It is recommended not to install a front sprocket lower than 15 tooth.
It creates added chain and sprocket wear. Better to add teeth at rear sprocket.
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post #5 of 22 (permalink) Old 02-17-2009, 12:49 AM
 
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I just ordered a 520 conversion with 15/41 gearing. should be here this week.
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post #6 of 22 (permalink) Old 04-15-2009, 08:50 PM
 
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Somebody wants to trade me with his 04 RC51 Nikky Hayden model with my 03 Kawasaki 600RR. I drove the RC 51 and I am definitely not used to the vibration of the twin. My concern is that in slow traffice it is so hard to keep it in the right gear and when cruising you can barely get out of second gear without the engine lagging and when crusing at lower RPM's you could feel the jerking of the bike.

Is it me or is it really like this? Will the change in gearing make this more driveable? I do not race but really like the bike. It is just so hard to drive around they way it is. If I change the gearing where can I buy it and how much does it cost?

Thanks,

jay
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post #7 of 22 (permalink) Old 04-15-2009, 09:09 PM
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What RPM are you at when this occurs?
These bikes aren't Harleys and prefer to rev.
I know mine really doesn't like it much when I go below 3500 RPM.
I sometimes have to slip the clutch to prevent the bike from bucking at such slow speeds. Get her up to 4000 RPM and she's happy.

Changing the final ratio to 15/41, 42, or even 43 will allow the engine to run better in it's power band.
It's well known that Honda over-geared the bike as delivered.
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post #8 of 22 (permalink) Old 04-15-2009, 09:15 PM
 
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Quote:
What RPM are you at when this occurs?
These bikes aren't Harleys and prefer to rev.
I know mine really doesn't like it much when I go below 3500 RPM.
I sometimes have to slip the clutch to prevent the bike from bucking at such slow speeds. Get her up to 4000 RPM and she's happy.

Changing the final ratio to 15/41, 42, or even 43 will allow the engine to run better in it's power band.
It's well known that Honda over-geared the bike as delivered.

You got the words out of my head. I could not use 3rd gear it would be below 3500 rpm at normal traffic speeds. My 600RR would be able to use all 6 gears on the route I tried the RC51. How much would be a set of gears? What would you suggest I get? It is also very slippery on Guam.

On a note how is the maintenance on the RC51 compared to the 600RR?
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post #9 of 22 (permalink) Old 04-15-2009, 09:42 PM
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The RC51 is one of the most reliable engines Honda made (per UK bike magazine).
I've got over 40K miles on mine and I've heard of others that have 60K+ and even 100K miles.
The valve check internal is every 16K miles, and from 24K to 40K miles I only had one exhaust valve barely out of spec.
As with any engine, routine maintenance is the key.
Treat her lovingly and she will reward you.
And since Guam has a lot of salt air, buy a tube of dielectric grease and apply to every electrical connector you can, including the battery posts.
It waterproofs, prevents corrosion, and lubes the connectors.
Also put a dab on the spark plug boots and caps, it will prevent the rubber from bonding to the plug porcelain.

Do they still use shells mixed with asphalt to pave the roads?
It's been ages since I was on Guam. Where do you find the roads to open her up?
It's not a huge island.
There used to be a long stretch from Agana down to the tip where the Navy base was.
Of course you had to watch for the crabs on the roads at night.

You can choose from many different brands of sprockets.
For the rear you can use steel, aluminum, or a hybrid of both (Stealth sprocket).

A set of sprockets might run around $100 more or less (no chain).

Last edited by SubSailor; 04-15-2009 at 09:46 PM.
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post #10 of 22 (permalink) Old 04-15-2009, 11:25 PM
 
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Quote:
Do they still use shells mixed with asphalt to pave the roads?
It's been ages since I was on Guam. Where do you find the roads to open her up?
It's not a huge island.
There used to be a long stretch from Agana down to the tip where the Navy base was.
Of course you had to watch for the crabs on the roads at night.

hahahah, you got it right. I like the RC51 but I also want to be able to drive it around and enjoy it. I do not go very fast there is no place to go anyway. Should I swap the 600RR the RC51 will also hold its value longer.

Will I need to replace the chain if I replace the sprockets? Any suggestions on the ratio?
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