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NEWbie with some serious questions :)

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NEWbie with some serious questions :) - 1/22/2005 10:43:57 PM

BlindLOKI

Posts: 728
Joined: 1/22/2005
Status: offline

Hey guys, I just recently purchased my first street bike. '03 CBR 600 RR

I know ill probably get reamed with several posts about this not being a "beginners" bike. But hey... it only goes as fast as YOU make it. I have a little bit of experience on two wheels and have so far felt pretty comfortable with this bike. It does at times, however, scare the bejesus out of me... but who doesnt get that kick in the pants every now and then? these machines are nothing short of amazing. Im only 19 years old (as of january 20th :P hahah) but I promise promise promise, to be carefull. safety first.

Now to my questions:

1. The previous owner had decided he needed more torque for, as far as I can guess, better corner exit speed and bottom end "punch"
To achieve his goal, the said owner changed both sprockets, going down one tooth in the front and up two teeth in the rear. How
much difference is this going to make? what would my current gear ratio be? is it still the same?

2. I know messing with the sprockets skrews a bit with the speedometer, and this problem rears its ugly head exponentially as your
speed increases. Is there anyway I can re-calibrate my speedo?? If not... in which way does my "real-time" speed differ from my
"speedo-knows-all" speed? I would think my speedo would show higher than what I am actually doing... right?

thanks for any help guys, hope to get some new pics up after I get some turn signals and some covers for the spots on the engine case/clutch cover that the previous owner scuffed. yeah... he dumped it :P

Cya later,

Chris

< Message edited by BlindLOKI -- 1/23/2005 3:42:06 PM >

Post #: 1

RE: NEWbie with some serious questions :) - 1/23/2005 10:23:41 PM

BlindLOKI

Posts: 728
Joined: 1/22/2005
Status: offline

bump^^^^^

if I am completely wrong and the speedo does nothing, feel freee to tell me lol I just want some answers ;) thanks

(in reply to BlindLOKI)

Post #: 2

RE: NEWbie with some serious questions :) - 1/23/2005 11:09:09 PM

Nipz

Posts: 215
Joined: 10/22/2004
Status: offline

as for question one. yes lowing you front sprocket and making you back bigger make the bike acceleration will be faster if you can keep the front weel down. You may lose some tope end, If you bike can red line in top gear stock, but some times if the bike could not red line in top gear it would raise the top MPH.

As for question Two. yes it can mess with the speedo but not alway. some bike like mine F2 has a speedo pick up on front tire. so gears would not mess with the speedo. but on a 600RR not sure if it on the crank or the front tire. Most bike that i know of have it on crank. not sure how much it will mess with you speedo if it does. best bet to find out it have some one on a bike or car go 45MPH and see what it on your bike and do the same for some other speeds.

hope that helps

Nipz~

< Message edited by Nipz -- 1/23/2005 11:24:31 PM >

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~~~~~~~~~~~~~~~~~
1993 CBR600F2 (sold)

1991 CBR600F2 893cc AKA F9

(in reply to BlindLOKI)

Post #: 3

RE: NEWbie with some serious questions :) - 1/24/2005 12:00:06 AM

sirlimpzalot

Posts: 1404
Joined: 8/24/2004
From: Roseville, CA
Status: offline

OK..the 600RR has the speedo driven off the transmission, so the gearing you state is going to affect the accuracy in a big way....so if you are reading 70 mph I would guess that it is actually near 55-60, but the best way to check is to find a car or another STOCK bike and compare your speed versus thiers....another thing is speed = mileage....so if you drove for 2 hours at a indicated 70 mph = 140 miles, but in reality you were only doing 55 mph= 110..that is a 30 mile difference in just 2 hours!!!
but why someone would gear a 600rr that way unless they are doing alot of wheelies, is beyond me...I just 225 miles today on one and thought the gearing was a bit low ( meaning it was awfully busy at 80 m.ph. There is NO SPEEDO recalibration available that I am aware of...

(in reply to BlindLOKI)

Post #: 4

RE: NEWbie with some serious questions :) - 1/24/2005 8:05:16 AM

chainstretcher

Posts: 4560
Joined: 11/5/2004
Status: offline

Two speed calibrations devices on the market that I know of: Yellow box by black robotics is one and the other one you'll have to google to find. Ran across it the other day -- runs $90 with Honda connectors (no splicing).

Here I found it for you. speedo calibrator and yellow box

Now I want great big smiley faces dammit for taking my time to search stuff for newbs on this site

_____________________________

It's better to burn out ...
Than high side!

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Post #: 5

RE: NEWbie with some serious questions :) - 1/24/2005 12:11:02 PM

Canes600RR

Posts: 59
Joined: 12/22/2004
Status: offline

quote:

ORIGINAL: chainstretcher

Two speed calibrations devices on the market that I know of: Yellow box by black robotics is one and the other one you'll have to google to find. Ran across it the other day -- runs $90 with Honda connectors (no splicing).

Here I found it for you. speedo calibrator and yellow box

Now I want great big smiley faces dammit for taking my time to search stuff for newbs on this site

Thanks bro...now I can look at it for my bike as well.

you dont get any smiley at all

j/k

(in reply to chainstretcher)

Post #: 6

RE: NEWbie with some serious questions :) - 1/24/2005 8:48:03 PM

BlindLOKI

Posts: 728
Joined: 1/22/2005
Status: offline

<<<< do you see it? can you really!?!?

thanks a lot man, ill be looking into it

(in reply to Canes600RR)

Post #: 7

RE: NEWbie with some serious questions :) - 1/24/2005 10:06:37 PM

chainstretcher

Posts: 4560
Joined: 11/5/2004
Status: offline

Geeeez ... look what I've turned into ... Oh My Gawd -- I'm a smiley whore

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Than high side!

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Post #: 8

RE: NEWbie with some serious questions :) - 1/25/2005 4:35:00 PM

reevesna

Posts: 82
Joined: 1/15/2005
Status: offline

in my own experience changing ur sprocets like that will greatly affect ur acceleration and is great for wheeling...probably not so great for a newbie on a 600rr...also the change puts a lot more stress on the chain and will wear quicker due to the smaller diameter front sprocket...as always sirlimpzalot and chainstretcher know what they're talking about...however there is a much easier way to identify ur actual speed without having to drive for 2 hrs to see how far u actually go ;)...simply travel on an interstate with designated mile markers...reset ur trip right at one mile marker and check where it is when u pass the next...keep checking them...u can get a good idea how far its off by traveling 10miles worth of mile markers...of course the further u travel the more accurate ur guestimation of how far off it would be...if u travel 10miles worth of mile markers and ur trip only reads 7miles then ur speedo is off by 30%...however if u travel 100miles worth of mile markers and ur trip only reads 77miles then you know your speedo is off by 23% so its all about accuracy...i had to do this with a truck i had that someone put larger tires on it ;)

(in reply to chainstretcher)

Post #: 9

RE: NEWbie with some serious questions :) - 1/25/2005 6:52:18 PM

chainstretcher

Posts: 4560
Joined: 11/5/2004
Status: offline

Exactly -- if you decide to get one of the speedo fixers you'll have to know what your error is. Then you flip a couple switches on the box and it corrects your odo and speedo. Easy. Also, if ya have a buddy with a GPS you can make a crude temporary mount and use it to verify speed/distance and then set the correction device.

_____________________________

It's better to burn out ...
Than high side!

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Post #: 10

RE: NEWbie with some serious questions :) - 1/29/2005 12:29:03 PM

stephen4785

Posts: 163
Joined: 12/29/2004
Status: offline

Our bikes have speedometer's?

LOL

(in reply to chainstretcher)

Post #: 11

RE: NEWbie with some serious questions :) - 2/2/2005 1:34:22 PM

wally28_osu

Posts: 63
Joined: 2/2/2005
From: Columbus, Ohio
Status: offline

however there is a much easier way to identify ur actual speed without having to drive for 2 hrs to see how far u actually go ;)...simply travel on an interstate with designated mile markers...reset ur trip right at one mile marker and check where it is when u pass the next...keep checking them...u can get a good idea how far its off by traveling 10miles worth of mile markers...of course the further u travel the more accurate ur guestimation of how far off it would be...if u travel 10miles worth of mile markers and ur trip only reads 7miles then ur speedo is off by 30%...however if u travel 100miles worth of mile markers and ur trip only reads 77miles then you know your speedo is off by 23% so its all about accuracy...i had to do this with a truck i had that someone put larger tires on it ;)

reevesna has the right idea but wrong how to do it. what you need to do is get on the interstate and ride at a constant speed for say 10 miles. Then, divide the 10 miles by how long it took you to ride that far. this will give you your speed for that distance. But to be more accurate you will have to travel further and do the same thing i just mentioned. The way reevesna had you doing it would have been incorrect. resetting your odom at one mile marker and checking it at the next will have no effect because your tires are not getting bigger or smaller (i assume the tire sizes were not changed when the sprockets were changed). Now if the tires are bigger or smaller then yes it will affect your speedo. however just by changing the sprockets will not, or should not because the tires are still rolling over the same distances as they were before which has no affect on speed. Bigger tires will roll farther, so your disance will be shorter...smaller tires will roll over a less amount of distance and your mileage will be more. your speed would also be affected by that. what reevesna said about the truck having bigger tires on it, is what im talking about. since the tires were bigger than the stock tires that the speedo was probably calibrated at, the speed would be off. do you get what im saying? sorry for the whole "school" lesson, but i didnt know how else to put it other than this...if i am wrong some how, someone please correct me.

(in reply to stephen4785)

Post #: 12

RE: NEWbie with some serious questions :) - 2/2/2005 4:02:51 PM

chainstretcher

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Joined: 11/5/2004
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quote:

Now if the tires are bigger or smaller then yes it will affect your speedo. however just by changing the sprockets will not, or should not because the tires are still rolling over the same distances as they were before which has no affect on speed.

Well, you're 1/2 right. Different tire sizes will affect the speedo slightly. Usually less than 5%. However if the speedo pickup is reading the counter sprocket -- then sprocket size DOES affect the speedo.

A sprocket has a fixed number of teeth. So for example the front has 5 teeth and the back has 10. Every time the front turns 2 revolutions the back turns 1. Change the back sprocket to a 15 tooth. Now the front spins 3 times for every 1 rev of the back. Definitely affects the speedo.

_____________________________

It's better to burn out ...
Than high side!

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Post #: 13

RE: NEWbie with some serious questions :) - 2/6/2005 12:58:35 PM

rEdLyNeR

Posts: 244
Joined: 1/9/2005
From: Decatur,IL
Status: offline

Speedo Healer from cal-sportbike.com, works like a charm!!!!

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STEP UP OR STEP OUT!!!!!!

1993 CBR 1000F

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Post #: 14

RE: NEWbie with some serious questions :) - 2/13/2005 10:37:47 PM

yellow929boy

Posts: 20
Joined: 1/27/2005
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Nipz , the amount of revolutions on the crank is called RPMs not MPH. Sorry mabey you meant somthing else. the speedo would actually but run off the trans. yea it is affected.

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Post #: 15