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.
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Scott Blaylock
