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I recently picked up a 2001 TRX500FA for cheap. It runs good but won't shift out of 1st gear. And it sputters/hesitates when in reverse. The dash is also flashing when running.

I tried searching similar threads and found a few that mentioned various things like the angle sensor. I tested and replaced that to no avail.

What should I try next?

Here's a video of the dash flashing:

The ATV also makes a weird metallic howling noise just off idle. I suspect this is an unrelated issue to the shifting problem though.
 

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The Hondamatic transmission may not work because of a bad computer, wiring or sensor. The ECU Bypass System from subzerosound bypasses the computer and always applies voltage to the shift motor. It fixes electrical problems, but not mechanical problems inside the transmission. The ESP Mode will work with the Bypass System, but the AUTO Mode will be disabled. If you want this work-around, contact bubbabaryl (at gmail).
 
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