Tacho Showing Double RPM When Hot

[YAMAEXUP]

Anyone else had this?

I was riding home earlier after a rideout & the revs were showing really high, when I knew that the sound of the engine was a lot less. Once home I switched off & left it for 5 mins then tried again...still displaying twice the normal tickover rpm.
So I left it for 2 hours & tried again just before locking up for the night & the revs are normal. I'm thinking a connection problem somewhere which is affecting the readings. I'll start at the black box & use contact cleaner then GT85, but I won't know if i've found the problem until I get the engine really hot again.

Anyone have a similar problem before??

[yzfpaul]

hi ya timbo
if its a taco problem i have a spare in the shed you could try

[YAMAEXUP]

Thanks Paully. I'll keep that in mind.

Strangely the bike worked ok all the way to & from Jayson's place last year.

Do you remember that Jayson still has a spare black box from your YZF days