Both of my 350Fs have a flat spot right at 1/8 throttle. It's most noticeable when revving before a downshift (blubbering) and right at take off from a stop. My '73 is worse. Both bikes are very similar. The '72 is noticeably louder so perhaps the exhaust is more open on it. Both bikes run great and idle reliably, both were sync'd with my Carbtune. The '73 has new points/condensors as well. Timing is dead on. I ran it earlier today with the air filter removed. It did appear to make a difference. I put the filter back in and drastically adjusted my pilot air screws to 2 full turns out. The 2-4 plugs still carbon up but the blubbering is nearly all gone. I know it's leaner because now it pops a little upon deceleration. I hope my modified foam air filter idea will lean it out more. My idle suffered though, it's nowhere near as rock steady as it was. I have hondaman's modified emulsifier tubes in the back of my mind but I hope to find a happy medium between my filter and pilot screws. It is also very hard to start when cold.
