Not your usual sprocket question, I need your input - Honda Motorcycles - FireBlades.org
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post #1 of 13 Old 06-20-2004, 1:01 PM Thread Starter
 
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Not your usual sprocket question, I need your input

I went 1 down in the front of my 954 to a 15t sprocket. It seems to be too RPM happy and I top out at like 136 tach'd out. I figure the best solution would be to fine tune my gearing by now changing the rear sprocket. My question is should I go 1 down or 2 down.
My bike is used mainly for street riding, canyon carving, and am "occasional" wheelie. That is why I figured going 1 down up front would be good because I was having a hell of time clutching it up in 2nd, so I figured this would fix my problem, but it over-corrected it. Or maybe should I put my stock sprocket back on and go up 1 or 2 teeth in the rear?

Thanks for the help.
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post #2 of 13 Old 06-20-2004, 1:20 PM
 
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Re: Not your usual sprocket question, I need your input

Going down one tooth in the front is akin to adding three teeth out back, or a 9.3% increase in gearing across the board in your case. That's a much more steeply geared motorcycle you're riding now.

After owning a 954 myself, I'm a little surprised that anyone would want to go to a 15T front to begin with. The bike's got good torque in its stock configuration.

If you don't want to do the cheap thing and simply reinstall the stock countershaft sprocket, I'd suggest dropping two teeth on the rear chainring. Dropping only one might not get you back close enough to the factory gearing you're accustomed to.

I recently went from a 15 to a 14T front on my Monster. It was already plenty punchy on the low end and I likely reduced my top end capability by around 12-15 mph, but I don't need to be going more than 130 anyway (in fact, I don't need to be going more than about 80 at this point in my life).

I'm more interested in around town/nearby country sport riding/cruising, so the more aggressively geared personality suits me well.

FWIW

Last edited by Chain; 06-20-2004 at 1:24 PM.
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post #3 of 13 Old 06-20-2004, 2:55 PM
 
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Re: Not your usual sprocket question, I need your input

I have 15/44 (-1/+1), and I topped out at 163 indicated. That was without speedo recalibration.

Last edited by brian48130; 06-20-2004 at 2:56 PM.
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post #4 of 13 Old 06-20-2004, 4:44 PM Thread Starter
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by brian48130
I have 15/44 (-1/+1), and I topped out at 163 indicated. That was without speedo recalibration.


Brian, how much do you think your speedo is off when it reads 163?
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post #5 of 13 Old 06-20-2004, 5:55 PM
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by HyrePower
Brian, how much do you think your speedo is off when it reads 163?
I am -1 tooth on my 954 AND have an Ahlman's unit to correct the speedo and have seen 165mph with a bit more to go.

There's no way your tach'ed out at 136mph with that gearing. My bike does 137mph at the dragstrip in 4th gear not even revved out yet.....

Last edited by CBRGuy; 06-20-2004 at 5:57 PM.
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post #6 of 13 Old 06-20-2004, 6:31 PM
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by CBRGuy
I am -1 tooth on my 954 AND have an Ahlman's unit to correct the speedo and have seen 165mph with a bit more to go.

There's no way your tach'ed out at 136mph with that gearing. My bike does 137mph at the dragstrip in 4th gear not even revved out yet.....
thats what i was thinking too ..... but there are some special bikes out there, some even pull like a powerhouse in 6th gear at 1000 rpms
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post #7 of 13 Old 06-20-2004, 6:33 PM
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by HyrePower
I went 1 down in the front of my 954 to a 15t sprocket. It seems to be too RPM happy and I top out at like 136 tach'd out.
That sounds rather impossible...
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post #8 of 13 Old 06-20-2004, 6:37 PM
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by Chain
After owning a 954 myself, I'm a little surprised that anyone would want to go to a 15T front to begin with. The bike's got good torque in its stock configuration.
C'mon Chain, you of all people know the answer to this: ACCELERATION BABY, ACCELERATION!!!!!!!!!!!!! Who cares (as far as street riding goes) if you lose a few MPH topend, it's the adrenaline rush of acceleration that makes my day!
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post #9 of 13 Old 06-20-2004, 7:09 PM
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by HyrePower
Brian, how much do you think your speedo is off when it reads 163?
I think I read 12-18% somewhere for 15/45. I just pretend it's accurate though to keep myself in check on the street.
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post #10 of 13 Old 06-20-2004, 7:23 PM
 
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Re: Not your usual sprocket question, I need your input

I know mine was off around 12% @ 60MPH after the 15T change. But I purchased the Ahlman speedo correction unit and dialed it in via GPS. Don't know how the % error correlates to speeds over 100MPH though. Is the error a linear thing through the entire speed range? Anyone?
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post #11 of 13 Old 06-20-2004, 8:00 PM
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by Bacchus
C'mon Chain, you of all people know the answer to this: ACCELERATION BABY, ACCELERATION!!!!!!!!!!!!! Who cares (as far as street riding goes) if you lose a few MPH topend, it's the adrenaline rush of acceleration that makes my day!
Couldn't agree more. That's why I regeared the Monster.
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post #12 of 13 Old 06-21-2004, 1:07 AM
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by HyrePower
I went 1 down in the front of my 954 to a 15t sprocket. It seems to be too RPM happy and I top out at like 136 tach'd out. I figure the best solution would be to fine tune my gearing by now changing the rear sprocket. My question is should I go 1 down or 2 down.
My bike is used mainly for street riding, canyon carving, and am "occasional" wheelie. That is why I figured going 1 down up front would be good because I was having a hell of time clutching it up in 2nd, so I figured this would fix my problem, but it over-corrected it. Or maybe should I put my stock sprocket back on and go up 1 or 2 teeth in the rear?

Thanks for the help.
I changed my Gears for racing once to a 15 front and a 45 rear and i was topping out at 158-160

WSMC 954

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post #13 of 13 Old 06-21-2004, 1:41 AM Thread Starter
 
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Re: Not your usual sprocket question, I need your input

Quote:
Originally Posted by crazycuRRie
I changed my Gears for racing once to a 15 front and a 45 rear and i was topping out at 158-160
Maybe I am mistaken on what the speedo says, I may have been concentration on the ends of the sweepers. All I know is that I need to do something with the rear sprocket because my bike seems to wrap out to quick, especially when on the highway. It also makes it hard when trying to carry a wheelie because the engine braking is more aggressive now.
So let me get this straight, Stock gearing is 16 front and 43? rear. which means that going down 1 in the front would equal approx. 2.74 teeth if you were to get the same results from doing a rear sprocket change. So if I go down 1 tooth in the rear, that 2.74 ratio drops to 1.74, and if I go 2 down then it will be .74 which is about 27% of where I am at now. So I guess I answered my own question and I think I am going to go 2 down in the rear. Thanks guys for all the help.
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