Hi i currently have an mc21 and have been having problem getting it to start. my original engine seized. i than got a second hand engine. Bike was fine for a couple of days. Than it wouldn’t go. i got told by a mechanic that it was the cdi box. I have since bought two others and have gotten one put in an nsr that works. That bike started fine but mine still won’t go. There is no spark therefore no power to the coils. i was wondering if any one knows if you can bypass the pgm. can the power jet solenoids and RS valves servo not be used? Any help would be much appreciated.

I'd have thought (in standard form) the PGM did too much to be bypassed as the pulse generator and both coils run to it. Something needs to take the pulse and tell the coil when to fire, that something is the PGM.

But if one you've got works on another bike it's not the problem anyway and if there's no power to the coils at all something is amiss.

Hopefully someone wil correct me if needs be as the next bit about coils is not NSR specific;

The coil gets power from somewhere (hopefully a good battery, mine for instance will not start on the kickstart if the battery is flat, it needs a damn good bump to get the stator chucking some power out first), transforms it and stores it until the CDI/distributor/PGM or whatever sends the signal to send the power down the HT lead to the plug which sparks.

So looking at the '21 wiring diagram, if the battery is good and there's no power at the gn/br (green/brown?) wires into the coil it's not going to start, that wire runs back to the white plug on the PGM so see if there's any power coming out of it there.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

Hi,
As Fonty says, I don`t think it`s the PGM either.
There are other threads on here about starting/running problems which were traced to a short on the wires going to the pulse coils at the back of them where you can`t see it. You have to remove them to see.
There was another problem which was solved by cleaning the flywheel & pick-ups with a solvent.
Hope this helps.

is the battery good ? if it is try cleaning the pins on the pgm plugs and the rest of the loom with some electrical contact cleaner/fine sand paper. do the lights,horn,winkers work?