speedometer not accurate? spoil? or?

[junji3_jj]

im currently riding nsr sp 150. im having some probs with my speedometer. i tried comparing my meter with my friend who is riding sp also. when he is at 80 im 70

he 110 i between like 90-100 only.. the higher the speed the bigger the dif. another thing is my top speed only 120+ abit on meter. but when i at my top, (same speed as friend) his meter alr 140+ 150 .. few month back i was still able to go up to 140+ with pillion now donno y like tt.. any possbile reasons for it so i can make the suitable changes to my bike.

[stsoh]

your meter should be more accurate than your friend.

his might have been tempered with by his mechanic.

all mechanical speedometer have error of >+10%.

the higher the speed the more error as much as +20%.

electronic digital/sensor is more accurate with error of >+5%.

try getting someone bike with digital speedometer to ride with u n recheck.

if not get another rider, i believe your speedometer is OK.

 

basic maintenance is necessary like:

1) top up 2T engine oil.

2) lub chain very 1,000km.

3) change gearbox/clutch oil every 3 months.

4) change spark plug every 8,000~10,000km.

5) change air-filter if your is not cleanable every 20,000km.

[ZzGaNgStErzZ]

btw, speedometer actually not tat accurate. unless u find tat Tp camera, but oso not 100% accuratre. mayb u wan try wif some1 wif digital speedometer? but not wif a bigger CC bike pls, if not u will b more dissapointed.

[compfused]

TP camera is most accurate la..Why you may ask? Because if it clocked you breakin the speed limit and your speedo shows you were in the range of the speed limit you will still kena..Ahaha..

[mystery rider]

hmm..

i believe sp can easily hit meterspeed of 140+ 150..

 

So i assume ur meter is not accurate comparing to normal nsr Sp..

 

1st: ask ur mechanic check for the front rim speedo gear. the wan tat ur speedo cable tat link to.. either ur cable loose or the gear inside worn-out may cause tis problem...

 

2nd: if not... hmm.. check on ur speedometer console..

 

the above method should able to solve ur problem..

 

but dun rely on the speed tat it gives u even its correct speed comparing the other Sp.. cause on smaller cc bike meter is not accurate at all... plus minus 20km/p

[mystery rider]

Originally posted by compfused@April 04, 2007 11:49 pm

TP camera is most accurate la..Why you may ask? Because if it clocked you breakin the speed limit and your speedo shows you were in the range of the speed limit you will still kena..Ahaha..

I think he is just comparing his sp meter to another sp meter which i find tats nothing wrong wat...

Btw i think you got it wrong/opposite!

A smaller cc bike meter should be showing you more speed then the actual speed u were riding...

etc: passing by a highway limit 90 speed camera on meterspeed 115km/h

tats wat i always do...

[Demon]

Originally posted by junji3_jj@April 04, 2007 05:52 pm

im currently riding nsr sp 150. im having some probs with my speedometer. i tried comparing my meter with my friend who is riding sp also. when he is at 80 im 70

he 110 i between like 90-100 only.. the higher the speed the bigger the dif. another thing is my top speed only 120+ abit on meter. but when i at my top, (same speed as friend) his meter alr 140+ 150 .. few month back i was still able to go up to 140+ with pillion now donno y like tt.. any possbile reasons for it so i can make the suitable changes to my bike.

all vehicles speedo readings are about 7 - 10% optimistic. Meaning when it shows 110kph, you are actually slower, maybe 100kph. Technically, speedo readings from two bikes of same brand and model should be the same, unless something has been modified, such as tyre size different from stock.

 

one good way of knowing your actual speed is to use a GPS on a flat road. A cheaper option is installed a bicycle digital speedo (less than $55), as a secondary meter , and with the input of the correct rolling circumference of the front wheel, it will give you a very accurate speed.

 

 

 

[compfused]

Originally posted by mystery rider@April 05, 2007 09:21 am

I think he is just comparing his sp meter to another sp meter which i find tats nothing wrong wat...

Btw i think you got it wrong/opposite!

A smaller cc bike meter should be showing you more speed then the actual speed u were riding...

etc: passing by a highway limit 90 speed camera on meterspeed 115km/h

tats wat i always do...

Good for you..Pardon me but I was replyin to ZzGaNgStErzZ post hence why my post is directly below his and not after someone else's post..Sorry if its a crime to not quote someone before postin..I didn't know..

[mystery rider]

Originally posted by compfused@April 05, 2007 11:40 am

Good for you..Pardon me but I was replyin to ZzGaNgStErzZ post hence why my post is directly below his and not after someone else's post..Sorry if its a crime to not quote someone before postin..I didn't know..

nope...

its my mistake..

is not crime... u take it too serious liao...

[compfused]

Just clearin up myself..

[junji3_jj]

how about comparing to car meter? once i was riding 80-90 my friend behind driving car told me he reaching 100 le still cannot closed my any dist... keep gaping

[Ny0ng1]

then its almost confirm that your speedo is underestimating the real speed of your bike. i cant give any advice on what to do for now though, other than slow down on speed camera area

[ZzGaNgStErzZ]

wad bike u riding n wad car ur fren driving?

[Phang]

You can pay a small fees to Singapore Traffic Police to have them to check the speed of you bike using a high tech radar gun:-

 

- Find a speed camera hot spot.

- Ride past the spot and confirm there is a Police officer holding a radar gun.

- Ride past the spot again, if the speed limit is 70km/h, maintain your speed at 90km/h meter reading.

- Done.

 

 

Singapore Traffic Police will send a certificate to you indicating the actual speed of you bike in less than a week time. Compare the speed captured by the TP and the speed you maintained the other day (i.e. 90km/h) and you will know your speedometer error.

 

Don't forget to pay the fees of the speed check.

[junji3_jj]

i riding nsr sp 150... my friend driving hyundai accent.. no money pay fines la lol

[Phang]

Originally posted by junji3_jj@April 06, 2007 04:19 pm

i riding nsr sp 150... my friend driving hyundai accent.. no money pay fines la lol

Just joking brother, don't take it seriously... haha

[ZzGaNgStErzZ]

Originally posted by Phang@April 06, 2007 07:58 am

You can pay a small fees to Singapore Traffic Police to have them to check the speed of you bike using a high tech radar gun:-

 

- Find a speed camera hot spot.

- Ride past the spot and confirm there is a Police officer holding a radar gun.

- Ride past the spot again, if the speed limit is 70km/h, maintain your speed at 90km/h meter reading.

- Done.

 

 

Singapore Traffic Police will send a certificate to you indicating the actual speed of you bike in less than a week time. Compare the speed captured by the TP and the speed you maintained the other day (i.e. 90km/h) and you will know your speedometer error.

 

Don't forget to pay the fees of the speed check.

gd 1.

but maybe 100kmh will b better.

coz faster spd TP see liao den shoot u.

[gnayed]

Originally posted by junji3_jj@April 05, 2007 10:51 pm

how about comparing to car meter? once i was riding 80-90 my friend behind driving car told me he reaching 100 le still cannot closed my any dist... keep gaping

Well sad to say, car speedos are not accurate as well. I'm not sure for Hyundai, but like bigger Jap bikes, Jap cars have the same percentage of error.

 

I read 100km/h off my speedo, but it is only 93~95km/h off my GPS if I'm not wrong. Exactly the same for the new Honda Civics, I presume the same for all jap manufacturers. My bike is a Yamaha by the way. A Mitsubishi Evo 8 reads 265km/h on its speedo and ~253 on the speed trap.

[junji3_jj]

i went to a bike shop n ask.. the mechanic said some meters are "heavy" some r "light" so the way of the meter pointer going up will be slower if heavy... he said theres nth he could do bout it.. n about the speed stucking at 120+ he told me is engine prob -.- thinking find 1 day go jb check... my friend told me there will be more accurate one tell u the faults...

[mystery rider]

Originally posted by gnayed@April 07, 2007 06:11 am

Well sad to say, car speedos are not accurate as well. I'm not sure for Hyundai, but like bigger Jap bikes, Jap cars have the same percentage of error.

 

I read 100km/h off my speedo, but it is only 93~95km/h off my GPS if I'm not wrong. Exactly the same for the new Honda Civics, I presume the same for all jap manufacturers. My bike is a Yamaha by the way. A Mitsubishi Evo 8 reads 265km/h on its speedo and ~253 on the speed trap.

How do the car speedo work?

if i am not wrong they calculate by the crankshaft.

and if ppl change their rim size as in bigger rim or tyre size do u think tat the crankshaft able to calculate tat? the answer is no!

[mystery rider]

Originally posted by junji3_jj@April 07, 2007 08:52 am

i went to a bike shop n ask.. the mechanic said some meters are "heavy" some r "light" so the way of the meter pointer going up will be slower if heavy... he said theres nth he could do bout it.. n about the speed stucking at 120+ he told me is engine prob -.- thinking find 1 day go jb check... my friend told me there will be more accurate one tell u the faults...

Hey! why dont u go to another workshop to fix and try out wat i've already told you..!

[junji3_jj]

lol btw im a p plater... no pts for me to like tt play with la.. lol

[Demon]

Originally posted by mystery rider@April 07, 2007 05:31 pm

and if ppl change their rim size as in bigger rim or tyre size do u think tat the crankshaft able to calculate tat? the answer is no!

For cars, when you change to a bigger rim, you match it with a lower profile tyres so that the wheel rolling circumference is maintained as much as possible.

 

[junji3_jj]

one of my friend who is a ex sp rider told me might be the cable linking to the throttle is broken.. he said tt there was once he die die drag also 120 nia.. den he go motor shop den they said the cable is broken n changed it for him... 60+ wor... anybody heard of this thing b4?

[mystery rider]

Originally posted by Demon@April 08, 2007 04:51 pm

For cars, when you change to a bigger rim, you match it with a lower profile tyres so that the wheel rolling circumference is maintained as much as possible.

 

Even wif a little diameter change will highly change ur highspeed...

As the speed goes higher the off set turn more then wat we can imagine...

Unless the over diameter maintain compare to the stock diameter...