Rev counter jumping at high revs

[Sexysuzi]

Hi,

I have a gs550. At high revs, saying at constrain speed e.g. 6000 rpm, 55 mph the rev counter jumps 2-3k ! Engine is consistent.

Where or how should I start investigating this issue ? I check he cable and it was screwed int the top of the engnpine tightly.

Any pointers would be welcomed.

Thanks

[tkent02]

Probably a cable thing. Lube it, replace it, might be the tach itself needs a bit of lube.
What is constrain speed?
6000 rpm is certainly not high revs for a GS 550.

[Sexysuzi]

Sorry constant revs... iPad predictive text ! I will give it some lube:-)

[hampshirehog]

As Tom says, it's probably the cable. Pull it off and have a look at it - should spin really easily and the ends should be square, not rounded. Maybe spin the cable with an electric driil in reverse while it is still attached to the tacho.

At 6k rpm you are just coming in to the power. Max torque is 7.5k rpm.

[argonsagas]

Try adding a light oil into the back of the tach. Disconnect the cable and spray it, or leave the cable face-down and add a few drops, then let it sit for a half hour to penetrate.

Use REAL oil, not WD40.