Wednesday, November 12, 2008
Worked under the lights last night and pulled off both BMW carbs. Took them apart early this A.M. and replaced all "o"-rings and gaskets. Also raised the main needle jets one notch to enrichen the fuel . Found one idle jet "o" ring out of place and one choke assembly gasket bad. I'm trying to chase down a high end problem which causes the engine to stumble at higher RPM (5000 to 6500). Pulled the front cover and replaced the points, then reset the timing. Bike runs and starts better but still has the high RPM problem(?) Appears not to be getting enough fuel. I'll drain the tank next and make sure the intake petcock screens are clear. Might be that some old tank debris could be clogging the screens(?) I'll just keep screwing with things until I figure it out. Want the bike running good before we head out to CA. weekend after next. I've had this problem to some degree all summer. It seems that right after I fill the fuel tank the problem is less. That might indicate that the increased static pressure from the volume of fuel in the tank over comes the resistance of the clogged fuel screens. ( I hope, sounds good in theory anyway).