Log in

View Full Version : VFR400 Odd tacho problem


manicmedic
15th July 2008, 00:41
Hi,

I have a '93 VFR400R and I'm very pleased with it. Everything has been going well untill I noticed that the tacho was reading higher than before?!?!?

At 100kph, the tacho used to read about 7k ..... now it reads at about 11k. It's consistent through the revs reading high all of the time. Yes all the gears are still in the box and the bike is running well without the clutch slipping. I'm stumped as to why and how.

If anyone can help then I'd be greatful. Is there a test that a mechanical muppet like me can do?

Oh if these bikes are supposed to be rev limited at the red-line then with this problem it's not effecting it. 14,500 revs (re-line) and beyond is fine and nothing feels like it's over-reving or any different from before I noticed this.

Manicmedic
mark247
15th July 2008, 05:32
when it's idling does the tacho sit at the correct rpm or is it at like 7000rpm?
manicmedic
15th July 2008, 21:02
at about 3k
manicmedic
22nd July 2008, 20:01
Problem solved. All I had to do was post on here and the thing resolved itself. What a great site!

Manic
mark247
22nd July 2008, 20:02
Problem solved. All I had to do was post on here and the thing resolved itself. What a great site!

Manic

So what was it?
manicmedic
22nd July 2008, 22:12
No idea mate ..... just started working properly again ..... went from 11k at 100kph to 9k then just below 7k as it was before ......... very strange but sorted itself. Must have been your telepathy ..... thanks
mark247
23rd July 2008, 07:58
No idea mate ..... just started working properly again ..... went from 11k at 100kph to 9k then just below 7k as it was before ......... very strange but sorted itself. Must have been your telepathy ..... thanks

hahaha either that or maybe a bad earth
Folcan
1st August 2008, 13:35
I had a problem with my nc24 tacho. it was corrosion on the positive battery connection.
racefactory
23rd September 2008, 14:28
I have just run into this problem- except my rpm guage is now at least 3000rpm higher at all revs and gets worse when revved. Normal riding it is off of the clock... It happened as i started it one time.

Any further ideas as to how to fix? Possibly binded cable or something i have no idea....
racefactory
25th September 2008, 11:35
bump.

can anyone help? Really pissing me off now. There's probably a quick fix someone knows about..
MSTRS
25th September 2008, 11:42
These tachos are electric (not mechanical cable) driven. Right? hXc's Spada used to do this same reading high thing sometimes. Was probably a bad earth somewhere.
racefactory
27th September 2008, 15:08
Ok.... looks like it was exactly same as your problem! Mine just suddenly fixed itself!