Got my 74 850 back on the road after complete rebuild. About 500 miles on it. Seems to run just a little hot which I'm attributing to the engine still being a bit tite. Timing is spot on. Pulls really good and idles okay at first. If I shut the bike off after a good run say to get gas, I have to ticke the carbs to get it going again. Also, it won't hardly idle after that. Idle speed just drops til it stalls like it's starving for gas. I do have the tufnol spacers between the manifold and head. Any ideas.