Scott,
I can't say about your ignition or charging system. However, one thing
that would be helpful would be to know is the if bike is running on 1 or 2
cylinders. The best way is to use an IR temperature gun. Measure on the
bare aluminum, perhaps the exhaust nuts in the same place. Plan B would
be to just feel how hot the valve covers are.
If it is running on 1 cylinder then the Dyna III is the culprit.
Let us know how you make out.
Joe
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This is a new to me 74 R90S with a DYNA III Electronic Ignition and, I
believe, the upgraded 450 Watt charging system. Again, this bike is new to
me, but I have attached photos so maybe the trained eye can confirm.
As was mentioned in my previous thread, the bike had been sitting for a
very long time on a dealership floor as a show piece. I drained all the
fluids, added a bit of oil to the cylinders (thanks Richard), grounded the
plugs and cranked it until the oil pressure light went out. Put the plugs
back in, drained the old fuel, replaced it with 5 litres of Chevron Ultra
94, started it and ran it until the smoke cleared. Took the bike for a
quick 2 mile drive and was impressed with how tight the bike felt - WOW
was all I could say when I got home.
This morning I took the bike out for a 4 or so mile run and it ran
perfectly. Idled perfectly at stop lights and ran incredibly smooth. I
stopped at a Chevron to fill the fuel tank, again Ultra 94. The bike
started without the enrichener but didn't want to idle. The charge light
seemed to stay on until I brought the RPM above 2000. I pulled away and it
seemed to stumble a little bit and the Volt meter showed a discharge until
I brought the RPM above 3000. As I continued to drive the stumble got
worse. I engaged the enrichener to see if for some reason it opened, even
though I hadn't touched it at the gas station, but it made the stumble
worse. As I drove more it got worse and I needed to keep the RPM above
2500 for the bike to stay running. This reminded me of when the coil on my
R69S was packing it in, but in that instance it totally died after a mile
or so. I was able to limp the bike all the way home but it died in the
driveway as soon as I rolled the throttle off. As I'm at the office, I
haven't tried to start it again, so I can't say if it's a heat soak issue,
or now a constant low RPM stumble. I can check that when I get home.
Any ideas on where to start?
Thanks,
Scott.
--
Joe Dille
Telford PA
What happens on earth stays on earth
