my speedometer is off

[cpatt]

ok i was riding to day with one of my friends and my he says my speedo is off by like 5 mph. what would cause this?

the bike is an 03 xb12r with an 06 engine. so im sure its something i screwed up in the engine swap... where should i start the trouble shooting.

 

[anrkizm95]

5 mph off at what speed.its normal for the speedo to be off any where between 3-8 percent on most bikes.

 

[BuellyBagger]

i dont think 5mph is a huge deal on a bike i think ive read tire wear can cause variations of +or-5

 

[cpatt]

ok well now that i no i can just go 10 over all the time. i figured i must have screwed sumin up with the speed sensor or something like that

 

[ich]

straight cut vs. helical cut

 

[cpatt]

straight cut vs. helical cut

what?

 

[Dave A]

Maybe your friends speedo is off.

 

[GAXB9R]

Different manufacturers will set their speedometers at different settings. If you are able to mount a gps to your bike somehow and ride see how fast it says you are going. I don't know how accurate these are, but it is a way to test.[cool]

 

[cpatt]

well its deff off by more that 5 today. my friend said we were doing 48mph and my spedo said 60. i think ill try to find a way to mount the gps and go for a ride.

i no his spedo is right ive followed him in my truck before and it was all good.

is there anything that i should look at to maybe calibrate orr am i just rely going to have to deal with it.

 

[creeping death]

maybe you could pull the needle and try to reset it. i had to adjust mine when it changed the dash plate.

 

[DustyXB]

What he said ^^

That's tranny the only way to "recalibrate" our speedo. You might want to pull your sensor and see if it's dirty. That might throw it off...??

 

[cpatt]

That's tranny the only way to "recalibrate" our speedo. You might want to pull your sensor and see if it's dirty. That might throw it off...??

where is the sensor? is it that one by the sprocket on the engine?

 

[ich]

straight cut vs. helical cut

 

[cpatt]

straight cut vs. helical cut

can you elaborate on this?

 

[Blaylock1988]

The only thing I can think of that he is talking about is straight cut gears vs. helical cut gears. Maybe your engine has different gearing than the 03 model?

 

[ich]

www.dudeworld.com.au/downloads/2006.model.changes.pdf

 

[cpatt]

it has the helical cut gears. but i have the 06 speed sensor. and the ecm is flashed for an 06. so i dont think the gears are the problem.

 

[ich]

you think too much but know too little.

speedo is set up for a straight cut 42 teeth 5th gear. the helical cut transmission has a 48 teeth 5th gear. speed sensor, ecm are of no matter.

 

[cpatt]

i guess i was looking in to it to hard. so i need a new speedo set up. right?

 

[uly luigi]

speedo sensor reads a tone ring that is mounted to the output shaft of the tranny, sensing how fast the drive pulley is turning, it does not read any particular gear in the tranny, the only thing that will effect speedo cal is tire, pulley swap, or change in the tone ring, nothing forward/before the tone ring will change the calibration.