We are a shop in Austin TX, and have a customers Japan 'spec' M21 in right now. We had to wait a long time to get a rear brake m/c repair kit - which was sourced out of Australia. The customer wanted the bike 'de- restricting', so -- that was achieved with the help of the detailed mods to the wiring (orange ground at the PGM-111 unit, and 4/5/6th gear sensor wires spliced into 3rd gear) (Thanks!!)
The customer wanted some dyno figures - after the wiring mods, so - last week the bike was dyno'd. I did the wiring mods - but wasn't there for the dyno work. Apparently the dyno guys said the RC valves weren't operating properly, and between them and the mechanic that took the bike, they 'fudged around with it - and supposedly got some appreciable readings (We are still waiting for the figures!!).
Whilst they were checking things out, they opened up the RC valve servo motor - to make sure it was OK inside.
Back at the shop, I have been trying to ascertain exactly what the bike should and shouldn't be doing !!
Here are my observations so far ---
The bike is a pain to get started, especially after sitting for a couple of days!!
When the tank was taken off after it being run - the RC valve servo motor was pointing to HI. When the key is turned on, the pulley rotates counter clockwise and stops mid way between Hi -LO, then after about 5 seconds, turns clockwise -- a little further than HI. After unplugging the TPS plug, and turning the key back on, the pulley moves slightly anti clockwise and stops. The pointers on the RC valves are lined up at this point.
I have only had the bike running once since it was dyno'd, and - during warm up - and subsequent blips of the throttle - the servo motor remains static.
We have a Honda workshop manual for NSR250R G-N, SP J-N, SE L-N - however it does not have any reference to the M21.
In one of the troubleshooting tests on the RC servo motor - it refers to a W/BL wire in the coupler plug -- and there isn't a wire that color on this plug!!
I sincerely hope anyone can help us better understand this a little clearer, as it would be nice to see the bike back with it's owner!!
Thanks in anticipation!!
Brid.