New 20 ounce tumblers available now! Forum donation credit with purchase. https://www.wildguzzi.com/Products/products.htm#Tumbler
Spark plugs spark very differently under compression pressure than in open air. I would suspect the dyna although you don't. I won't use one anymore after seeing things like this repeatedly. YMMV!
This is a good point and would explain the sudden simultaneous failure. I'll query Dyna about how to text their unit. This one has only 500 miles on it. My 850T has gone 3500 miles on its Dyna III. If it turns out the Dyna has failed, I'm back to points for both bikes.
BTW, the Dyna III and coils setup, with all its good (and bad) reputation, needs a solid 6-8 amps to operate correctly.Eventually, as a final improvement, I set up the power feed to the Dyna III and coils via a dedicated relay, fed by a fused (10 A) 14 gage wire direct from the battery. The kill switch would now only serve as the trigger to that relay. This eliminates all the high resistance from the junction/fuse box to the ignition switch to the kill switch to the coils, in that order. As a bonus, you get a fuse-protected feed circuit to to the coils and Dyna, which Guzzi does not originally have, since the points don't really need that protection, being mechanical in design. Other people on this forum have done the same.
BTW, the Dyna III and coils setup, with all its good (and bad) reputation, needs a solid 6-8 amps to operate correctly. Eventually, as a final improvement, I set up the power feed to the Dyna III and coils via a dedicated relay, fed by a fused (10 A) 14 gage wire direct from the battery. The kill switch would now only serve as the trigger to that relay. This eliminates all the high resistance from the junction/fuse box to the ignition switch to the kill switch to the coils, in that order. As a bonus, you get a fuse-protected feed circuit to to the coils and Dyna, which Guzzi does not originally have, since the points don't really need that protection, being mechanical in design. Other people on this forum have done the same.
I have never had an issue with the dyna 3.I have had 3 piranha electronic ignitions die on me, which is why the points plate and points live in the bag. Always on 100 deg days 100 + miles from home.The dynas been in there 21 years and 130,000 miles.But obviously YMMV.Cheers
There is always one Dyna lover who ruins any anti dyna thread I have read.
Well, there was nothing wrong with the Dyna III, other than that it wasn't getting the amps it needed -- thanks for suggesting that, Charlie.
Well, there was nothing wrong with the Dyna III, other than that it wasn't getting the amps it needed -- thanks for suggesting that, Centauro.After spraying DeOxit onto all the switch terminals and into all the Molex connectors -- far too many of them! -- I still couldn't get a cylinder to fire. So I ran a jumper from the battery directly to the coils and bang. That was it. I've been working without a wiring diagram for this bike from the beginning -- the harness doesn't correspond to any other Guzzi made in '89, which all had electronic ignitions (Motoplat I think). The closest points map I could find was Carl Allison's diagram for the '87 Cali III. That bike puts the coils in parallel with the rear brake light switch. On the Mille, that switch sits behind the coils. So I ran a jumper from the positive terminal of the brake light switch to the coil power terminals -- a four-inch run -- and now have a fused line to the ignition system. I don't know which fuse it is, of course -- no wiring diagram, and no labelling on the four fuses. But the bike runs great on the Dyna III now, so we're happy again.