Rev counter phenomena

It's not my bike or my problem, I responded to the original poster. I'm
intrigued by the fault finder though, does it give these indications at any
time, or only when you start a special procedure?

 

No but it's a start ;-)

 

Some Triumphs have a partial fault finding mode - if the tacho drops to
zero quickly followed by the engine stopping, it means the ignition
pick-up coils blown up

 

To be honest I can't remember. It only happened once and that was over two
years ago.

 

"tallbloke" said

<snip>

On start-up... can't remember how long it or if it continued for any length
of time.

 

When you switch it on, and before you start the engine, it does a self
test. Suzukis do it too. I've never seen one indicate an error
condition, but I think it's along the lines of "if the needle points
at 4000 rpm then the engine temp sensor has failed" or somesuch.
--
Please add "imo" to above post.
Champ
GSX-R 1000, GPz 750 turbo, ZX7RR Endurance Racer x 2
GYASB#0 BotToS#2 BOTAFO(T|F)#35 WG*#1 DFV#8
Team UKRM Racing : www.team-ukrm.com

 

You get them when there's a fault detected when you start the engine, and
they seem to carry on going if you decide to ride away regardless.

On the Fazer 1000, the needle flicks from zero to the fault indication rpm
(ie. 7k is "exup valve seized"), then back to zero, then to the actual
engine revs for a couple of seconds, then back to zero to begin the cycle
again.

Just looked it up, and 3k is for the throttle position sensor, 4k for the
speed sensor, 7k for the exup valve, 9 k for the tip-over switch, and 12k
for valve bounce.

HTH, etc.

 

On the Tedium it is supposed to do rather odd things if the throttle
position sensor (TPS) is out of order. More amazing is that if you have
to calibrate the TPS you can make the rev counter read degrees of
throttle position by disconnecting and reconnecting things in a certain
order. - "What revs were you at?" - "I have no idea but I had 76
degrees throttle angle".

 

RTFM. On my Divvie, if you started it up and the rev counter needle went
instantly to 5k and stayed there (irrespective of what revs the engine
was actually doing) it meant the throttle position sensor needed
adjusting.

Lots of bikes use electronic tachos as fault-finders. Injected GSXRs,
for a start.

 

Greasing it may fix the problem.

 

The Older Gentleman says...

Thunderaces too.