Speedo Error? - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

User Tag List

 
LinkBack Thread Tools
post #1 of 8 Old 03-03-2004, 7:48 PM Thread Starter
 
Join Date: 09-13-2003
Posts: 77
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
Speedo Error?

Just for shits and giggles, does anyone know how far off the speedo is -1 on the front sproket?
I know they are optimistic in stock form and get worse as you change final gearing ratios, but thats about it.
Thanks.
Voodoo954 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 03-04-2004, 2:16 AM
 
Join Date: 05-03-2002
Location: Montreal, Quebec Canada
Age: 63
Posts: 364
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 18
 
Re: Speedo Error?

From everything I've heard, the speedometer is about 4-5% optimistic with stock gearing. Going down one tooth will, I believe, make the speedo read about 11% too fast. Don't quote me on this, though.

Silver/black CBR954RR
Unsanctioned, unofficial, unloved Honda test rider
RaggedEdge is offline  
post #3 of 8 Old 03-04-2004, 4:19 AM
 
Join Date: 01-11-2004
Posts: 121
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
Re: Speedo Error?

well, based on the smart equation I've just learned from "speedohealer" (a speedometer correction box similar to the yellow box sold by calsportbikes), assuming a 5% stock error (which may or may not be accurate) and a partially worn tire (halfway between new and toast), you're looking at about a 13% error. It's the same as going up 3 (or is it 2?) teeth in the rear.

I once heard that because of a timing aspect in the engine, it was unwise to go down on the front, better to go up on the rear. Is this true? Does it also apply to the 954?
redcliffs is offline  
Sponsored Links
Advertisement
 
post #4 of 8 Old 03-04-2004, 1:56 PM Thread Starter
 
Join Date: 09-13-2003
Posts: 77
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
Re: Speedo Error?

Quote:
Originally Posted by redcliffs
I once heard that because of a timing aspect in the engine, it was unwise to go down on the front, better to go up on the rear. Is this true? Does it also apply to the 954?
Thats news to me.
Thanks for the input, tho
Voodoo954 is offline  
post #5 of 8 Old 03-05-2004, 3:02 AM
 
Join Date: 01-11-2004
Posts: 121
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
Re: Speedo Error?

Quote:
Originally Posted by Voodoo954
Thats news to me.
Thanks for the input, tho
It was news to me too -- as is probably obvious since I can't explain it! but it's worth doing more research on, I would think, just to be sure.

fwiw, I've also heard that going up in the rear as opposed to down in the front will help prolong chain life.
redcliffs is offline  
post #6 of 8 Old 03-05-2004, 6:36 AM
 
Jungleboy's Avatar
 
Join Date: 03-03-2003
Location: Sydney, Australia
Age: 44
Posts: 998
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Reputation Power: 18
   
Re: Speedo Error?

42/16=2.6875
42/15=2.8667

100% / 2.6875 x 2.8667=106.67
Therefore your if your speedo was spot on before it would now have a 6.7% inaccuracy!

2004 1000RR Racebike

www.jungleboyracing.com
Jungleboy is offline  
post #7 of 8 Old 03-05-2004, 12:38 PM
 
Join Date: 01-11-2004
Posts: 121
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 0
 
Re: Speedo Error?

but while his odo was near spot on or spot on before, his speedo had a built in optomistic error, +/- 5%.
redcliffs is offline  
post #8 of 8 Old 03-06-2004, 4:03 AM
 
Join Date: 02-22-2004
Posts: 3,586
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Reputation Power: 19
 
Send a message via MSN to matt232
Re: Speedo Error?

You can probably work it out yourself using something like the below which I stubled across at the Melbourne Motorshow.

Apart from having warnings of accident blackspots and stationary speed cameras it gives an accurate readout of speed using GPS satellites.

but its a pretty pricy speedo

link
matt232 is offline  
Reply

  Lower Navigation
Go Back   Honda Motorcycles - FireBlades.org > Honda Motorcycle Models > Honda FireBlade

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Motorcycles - FireBlades.org forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
A valid e-mail address is REQUIRED. You will not have access to any site features until you activate your account using the activation e-mail that is sent to this address.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Page Cannot Be Displayed Error alexandra General Discussion 31 12-11-2003 8:48 PM
speedo error w/ 15-43 sprockets and 190/55 Joachim2311 Honda FireBlade 9 10-03-2003 5:17 PM
Adding a digital speedo to an older bike (Sigma?) Pulse Honda FireBlade 8 05-27-2003 1:09 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome