The charging system doesn't generally make enough power to overcome the load until about 4k rpms. There are a few solutions to the problem.
- One is to buy some kind of battery eliminator (
www.bat-pac.com), which is just a capacitor that stores up a bit of charge. I've had mixed luck with them on Hondas, but might be worth trying.
- Second option: use an sla battery (do a forum search for sla), which is cheap, small and mounts at any angle - easy to hide under the seat. I ran my 450 on a 2.3Ah SLA for awhile, but don't recommend it - things get sketchy if you sit very long in traffic. I'd go 6Ah or higher.
- Third option: old honda charging systems typically have a charging circuit that only comes on when your headlights are on. It's there to compensate for the added draw of your lights, but it can be used to provide power at all times - just splice that wire into another hot coming from your stator. That might give you enough power at low revs to get your bike moving without a battery.
Good luck, let us know what you come up with.
A