Ugh. There is finally some nice weather outside and I am in the garage struggling to make my '91 850 run properly. I did a buncha stuff to it - new head gasket, proper valve shimming, replaced timing chain. I discovered how much water a gas tank full of stabilized fuel will develop over a Canadian winter (about 1/3 cup!)...
So the bike rolls over fine, there is spark (although it seems weak, bluish yellow rather than fat white) but I keep getting fuel pouring out when I go to start it up. It starts on one cylinder and when I play with the choke and throttle the 2nd kicks in then fuel comes out the overflow. I am an expert at bodywork/tank removal now, so I rigged up a separate fuel bottle to save me from that nonsense as I don't seem any closer to figuring this out.
Needle and seats, right? They are clean and nice. Now with the tank out of the way I can see the left carb backfiring upwards - and the over flowing hasn't even started. Did get the timing chain 180 degrees off? Is a weak spark to blame for intermittent firing? Any suggestions? I have had the float bowls off 3 times yesterday and today and no change...Is the left carb just dumping fuel in and causing the backfire?
I also replaced the emulsion tubes which were ovalled...