Recent content by Focus Research

I've been helping a friend resurrect an '81 Special. We bled the single front disk and put in new pads. The disk does not have any deep grooves. The lever feels very firm, and I certainly cannot pull it back to the grip. I'm not new at bleeding brakes, from cars to motorcycles. No bubbles...

IMPORTANT SCHEMATIC CORRECTION! I previously posted a schematic of the TCI Version B. There is an error in it. Capacitors C3 and C5 were incorrectly listed as 33uF. They are actually 3.3uF. They are corrected on this schematic, and the date/version number of the schematic are updated.

I previously asked if anyone had 'scope traces for the alternator ignition detection coils leading to the TCI box. Last night, I recorded some images from this 1981 model into a TCI12-01B unit. I found that the output of the coils didn't matter if the TCI box was plugged in or not. This trace...

Hi, I'm new here. I am helping a friend rework a pair of very tired, non-running XS650s, focusing on the electrics, since I am a degreed EE with plenty of test equipment. One of the bikes, a 1981, had the stock, non-function TCI box still attached to the bottom of the battery box, plus another...