MC21 no spark on one cylinder

[neal]

Fair play

[2TInstitute]

with single lobe you want a Zeeltronc PCDI-20V

[wellsy4719]

I've been thinking more on this topic. If, as you say, it only takes one lobe to trigger both plugs in turn, and mine only has one plug firing, I'm leaning on the UCU (pgm as you call it) being cooked. I'll try and get another one just to check it.

Thanks to you all for your advice and comments, I'll let you know the outcome, until then, end of topic from me.

[Jeram]

best of luck trying to find one, they're not the easiest things to track down and expensive too.

If your insistant on keeping the stock ECU, give this guy a bell, he fixes honda PGM ecu units

http://www.twostrokeracelab.com/

might work out cheaper for you.

[neal]

On the stock set up , it will need all 4 lobes to send signals to the pgm . There could be a problem with the pgm sending the signal to the spark plug .

Give me a shout if you need a pgm3 , my mate may have a spare one and I could pass on his details to you .

[wellsy4719]

On the stock set up , it will need all 4 lobes to send signals to the pgm . There could be a problem with the pgm sending the signal to the spark plug .

Give me a shout if you need a pgm3 , my mate may have a spare one and I could pass on his details to you .

Thanks for this info and apologies for not checking replies. I intend testing signals to and from the pgm3 to rule out the pulse generators and wiring. As I've already checked the pulse gens for specs and wiring for continuity to and from the pgm3 to the coils (and tried swapping coils without success), I'm thinking it's in the pgm3. I certainly don't hold with some suggestions of grinding off lobes, makes no sense, if only one is needed to fire both plugs why isn't it doing so now?
I'll get back to you and if need be will be interested in your mates unit.

[2TInstitute]

I don't see the difficulty.
Throw Honda shit box PGM in bin or find some unsuspecting dolt on the NSR forum to flog it to.
Buy Ignitech or Zeeltronic THEN AND ONLY THEN DO YOU GRIND LOBES OFF
Wire up and promptly forget about shitty Honda electrics.
Done

[Jeram]

Yep.

As Lozza said

Zeeltronic + 1 lobe flywheel.. That's what we've been saying all along

[neal]

Get a mate to help you , pull the plugs out , put a drill and socket onto the flywheel , spin it and check for power at every joint along the way .
Take it from there and see what happens , you should find the problem .
Used pgm's are expensive and are 20 years old , a replacement one could pop 1 month later as per Murphy's law . Sometimes they can be repaired .