Bonneville America Forums Forums Technical Forums General Tech Tachometer Reading High on EFI Models

Hi Folks. I have a 2010 Speedmaster with mechanical speedometer (as opposed to LCD speedometer) with default tune (20183).

I have noticed, on occasion, that the tachometer reads high by about 400-500 RPM throughout the rev range. It's kind of annoying to have a tachometer that isn't remotely accurate at this point. Also, I'm not sure if this could be a bigger problem in the end, like an igniter. The tachs on these bikes get their signal from the igniter, I believe. The bike has done this on and off since new (March, 2010) and currently has 15,000 km (9300 miles) on it.

My Speedmaster is currently on warranty, and I'll be reporting this to my dealer.

Symptoms and Reset Procedure:

o Occasionally reading 400-500 RPM high throughout the rev range (idle to any running speed)
o When engine is switched off, needle stays at or near ‘1’ on scale instead of at or near ‘0’.
o I have been able to ‘reset’ the tachometer by using the kill switch with the ignition ON. Sequence as follows:

. Ignition is ON
. Kill switch is ACTIVATED
. Ignition switch is turned OFF
. Turn Kill Switch to RUN mode
. Turn ignition switch ON and/or start engine.
. This works for a while (days, weeks, hours) and then requires another reset

Anybody else experiencing this?

H.

I've had the tach read a bit high on my 09 America, mechanical speedometer. Have only seen it a couple of times. Noticed it the first time after changing fuel map/tune with TuneECU. Don't know if it that had anything to do with it or if I was just paying more attention. When the engine was turned off the tach still read around 1000RPM. Didn't do anything to fix it. After a couple of on/off cycles it was normal again. I haven't seen it happen again in a long time.

Good to know that I have company (in a way). This situation seems to come and go, but sometimes just won't clear on its own for some reason. Anyway, I have had success by using my little procedure to help it along.

H.

Got the bike back from the dealer. The dealer couldn't replicate the problem. They had never heard of this before, and said that Triumph has no technical bulletin on this. So much for that!

I guess my reset procedure prevails. Pffft!

H.

I've had it happen several times on my 09 America. I reset by turning the ignition off and back on. I'll try the kill switch option next time !!

Interesting. That doesn't work for me.. I have to use the kill switch. It was misbehaving this morning for me again. It's odd that it can work flawlessly for months, and then it gets messed up all of a sudden.

H.