hey all new to the forum but i'm sure i'll be asking alot of question in the future. need a little help with a sprocket question, about two weeks ago i picked up a 04 1Krr.
noticed that the speedo was about 15 miles and our off at 55. got to looking and the rear sprocket has been changed to a 41 tooth. the shop were i bought this neglected to inform me of this. my question is haw can i determine how many miles are actually on the bike. thanks for your input.

 

Stock sprocket sizes are 16/41 (on US spec 04-05 bikes)

gearing calculator

 

really everything i've been able to find tells me that it should be an 40 tooth. even so what else would cause the speedo to be off by so much.

 

all speedos are off
when you change the gearing it is off by even more

when i put my 06 on the dyno the bike speedo read 185 at 6th gear redline
the dyno red 174

you have to get a speedohealer and then figure out by what percentage the bike speedo is off to make it read correctly


US spec bikes are 16/40 unless it is an 06
then it is a 16/41

the 04/05 euro bikes were 16/40

 

US spec bikes are 16/41 unless it is an 06
then it is a 16/42

 

Ya, stock for '04 - '05 is 16/41. But if your speedo is off 15mph at 55mph then something ain't right. I mean 5%-12% error for a bike speedo is almost expected but you're talking almost 30% off. Are you sure it doesn't have a 15/42 on it? No matter really, the best way to correct it is with a speedo healer -- easy install and set-up.

 

turns out that there is a recall on 04 speedo's, goes in next week to be replaced. hopefully that should fix it.

 

thanks, just call and scheduled mine too, I was very close on buying a speedo healer too.

 

my bad you are right i typod the US spec

 

its still a good idea, especially with a tooth change

when i had mine dynoed it was 15mph off on the top end compared to the dyno