magnumdart
There is a bad moon on the rise.
I have a Yamaha SECA 2 that will not run with the throttle opened up, just runs at idle. It seems to run ok at idle, although it seems a little high at 1100 rpm. The tach is probably not all that accurate. If you open the throttle quickly just a bit it will bog. If you slowly open the throttle it will start to run a little rough. If you continue to open the throttle past about 3000 rpm it will sputter and quickly die. If you open the throttle quickly from idle to wide open it makes no noise at all and dies instantly. It will idle for quite a few minutes if you turn the fuel valve off. In the morn I will check the fuel pump, timing, and coils. You can assume that everything is in good shape with new plugs,etc. The bike ran fine, was parked overnite, and the next mornnig it was screwed up from the moment it was started. As a precaution I will drain the fuel and put in fresh. I am completely unfamiliar with motorcycles so I'm open to suggestions of what else I should do or check. It is a 600 in-line four with four carbs.