Idle speed at 2000rpm

[mobil1]

Hi folks. I've asked this one before but can someone help.

My rev counter is showing 2000rpm at idle. It's not but thats what it's showing. I was told it would be a fault code saying the exup valve was seized. I've checked that and it's not. I've even looked for bad earths to no avail.

When I ride it the revs shoot up like mad. If I gun it they whip round and through the red line totally miss reading.

Any advice would greatfull

[MMUK]

EXUP fault is error code 7 (ie; 7000 rpm with ignition on).

Error code 2, IIRC, is charging circuit fault. This could be simply that your battery is fubar or it could mean that the reg/rec or stator is on the way out.

Are you noticing it dropping onto 3 cyls at all? This sometimes happens with a drop in voltage.

[MMUK]

Can you check out the battery voltages with a meter and post them up? IGN OFF, IGN ON, TICK OVER, 5k RPM. If you can do those four with lights both on and off?

[mobil1]

Hi Thanks for the reply

I'll give a check tomorrow and let you know.

It doesn't drop on to 3

It may well be the battery as its now 5 year old. Its Bosch.

I thought it might be something like that as the lights get brighter when the revs rise.

Cheers MMUK

[mobil1]

Hi MMUK

I got the following readings and as it was a hot day the fan switched in and made no difference to the reading

ignition off 12.20v

lights off
ignition on 11.75v

tick over 12.60-70

6K (from 2000 shown tick over) to give 5k
13.80v

5k (as if at normal tick over)
13.80v

I checked twice the readings on the first test it showed 14.30 at 5k
but once it got hot it went to the above readings

The next test, lights on stayed the same warm or hot

lights on
ignition on 11.70v- slow drop to 11.57 then creeps down

tick over 11.70-75v

6K (from 2000 shown tick over) to give 5k
14.20v

5k (as if at normal tick over)
14.10v

I hope this makes sense

One thing it has shown I need to balance the carbs which is on the list to do's anyway.

Cheers
Chris

[MMUK]

OK, your not charging. Tick over reading should be around 14.5v-14.8v. It's likely to be the reg/rec. It's well worth upgrading to the 5EB R6 unit.

[mobil1]

Bugger!

Cheers for the advice. I have spares so I'll dig that out.

I'll look at the R6 upgrade too.

Again thanks, Top Man

[mobil1]

Just another quick question. With the R6 unit is there need to modify or adapt?

[mobil1]

I've change the alternator complete as I don't have a soldering iron to remove the reg/rec.Its made no difference its still showing 2000rpm on tick over. I've an idea it may be the ignitor so going to dig out my french one and try that. If it does it then I'll look for uk one.

[itsnotagenesis]

The reg/rec should have either a plug that goes straight into it or leads leading to a plug that can be disconnected.
There shouldnt be any need for cutting and soldering wires.

[MMUK]

You've changed the stator? The reg/rec is a black box with a plug/socket arrangement, it's located under the rear side fairing on the subframe. It's a four wire plug. The upgrade isn't quite straight forward as you need to fit a new plug to the FZR loom and the R6 unit is 5 wire. All is not lost though, you just don't use one of the phases.

[MMUK]

REGULATOR-RECTIFIER


New item in Essex if you don't want to go down that route

[mobil1]

I'll have a look again but my bike is a 92-93 and according to the haynes the reg/rec is on the back of the alternator under the black cover. When I fleabay it the items they show are what are under the cover. Thats why I swapped the whole alternator over with my spare that I know works
Its driving me nut. I usually sus these things out.

[mobil1]

These are the items

Regulator

Rectifier