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Tachometer is inaccurate

730 Views 3 Replies 3 Participants Last post by  Tamir
I recently changed out the backlight leds on my 2011 CBR250R (ABS). I had to pull apart the whole dash unit to get in there. This includes taking off the tachometer needle. The leds work great now but the needle is in the wrong position. For example, when I'm idling at a stop the tachometer reads 0. Also when I'm close to redline the needle is off by a few thousand rpms. Has anyone had this issue before and have an idea on how to align it properly?
Thanks in advance.
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There's little bit of spring-preload to needle when it's sitting on stop, so you'll never be able get it back on shaft properly when engine's stopped. Here's how I was able to do it.

1. connect diagnostic tach to read actual RPM of engine (SUN make good unit
2. rev engine up to 2000rpm as shown on external tac
3. carefully re-install needle aimed at 2000pm
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