Hi all, I'm new to the site and need some of your advise help. My K6 750 is in good stock shape and running smooth, that is, I ride her nearly every day without issues, and I perform all my own maint. I've insalled a dyna-s and performed a complete tune up, valves, cam chain, timing, plugs, oil, (no carb maint.) about 300 mi/3 months ago. For the winter I put her away and installed a 4 to 1 pipe on her. Now that I'm ready to be ridding again, I fired her up on Saturday and rode her for about 20 minutes around my neighborhood. I practiced all throttle positions to test out the new pipe and the possibility of rejetting. The bike ran smooth and I deemed jetting unnecessary until I can test her on a highway
Sunday the bike started up and while warming up, suddenly she stumbled, shook, was running not on all four cylinders, then died.
She wouldn't start up again. The motor cranks, but that's it. It's like, as soon as she warmed up she shut off. I drained float bowls, gas and bowls were clean, plugs looked gray/tan and when I held them against the motor they sparked every time. Bowls don't leak from tuber or bowl seal. I didn't adjust anything from Sat to Sun, so what gives? Today I went out, reviewed everything was ordinary, started her up and she did the same thing: Starts ok, then slows, stumbles, dies, all in about 5 minutes. I try all combinations of air screw settings +/- 1/4 turns, choke in various positions, but she wont start back up.
What can I try next? I assume tomorrow when she has cooled totally off she will do the same again, and that makes me sad:( I'd love to hear of any procedure I can do to get her going.
Thanks for your help and if I can better explain my situation let me know how.
