TOPIC:

I recently rebuilt carbs, new points, new coils and wires. Bike starts and runs better than ever. Problem is after a short warm up period throttle response is great. But after it warms up completely it has a major hesitation most of the time. Acceleration and cruise are great but it seems to have a major hiccup, air screws are 2 turns out. Would adjusting these take care of it? I would think it would hesitate cold and better when warm, any ideas?

After the rebuild did you do a full proper carb sync using manometers ? If they are way out of sync that might explain what is happening.

I did a manual sync with plans to do a real sync. How would that affect my throttls response?

I'm probably not understanding your post correctly - you say acceleration and cruise are fine but you have a major hiccup. I'm not sure exactly what that means. With badly out of sync carbs in the past I have had poor performance and uneven running. As to exactly how out of synch carbs would effect throttle response I would rather leave that to one of the gurus. I would think response would be less than optimal.
Doing a full synch is just a suggestion. Would plug colour indicate if air screws at 2 turns out are at the correct setting ?

What I mean by hiccup is that after fully warmed up it has a really bad hesitation. Not notisable when running thru the gears but at idle it has a bad hesitation MOST of the time...

Bluemeanie wrote:

...fully warmed up...really bad hesitation. Not notisable when running thru the gears but at idle it has a bad hesitation MOST of the time...

Could be mistaken but interpret quoted cite to mean delayed throttle response from idle at normal operating temperature most of the time.

The following info might assist further diagnosis:
What were the running conditions before the ignition and carb work (reason for the work)? Were new spark plug caps also installed? Appearance of plugs at firing ends?

As operating temperature affects the symptoms, are valve clearances within specs? (Thinking they might become too tight at normal operating temperature).

I've owned the bike since new and with minor maintenance always ran good. Last few years would never start cold with electric starter, 1-2 kicks would do it. Rough idle, lousy milage. Over time all rubber was hard as a rock (vacuum leaks) Finally spend major bucks at Z1 and replaced all carb holders, intake boots, rebuilt carbs, rebuilt accelerator pump, new points, plugs. Wanted better coils and wires (could not afford Z1 coils) found practically new Andrews coils with Accel wires on ebay. Unbelevable differance! Bike starts up with elect on the coldest mornings, runs smoother, idles smoothly. Side note, while rebuilding carbs, found all gas passage holes for accelerator pump covered with wrong gaskets. So I now have good response with accel pump when cold but not as much when warmed up. I have air screws on top, which stock setting is 2 turns out, which is where I'm thinking is the problem. How far from stock setting can I go? My next project is a valve adjustment (not looking forward to!) Sorry about the long winded expaination...

Do NOT be sorry for long windedness at least for me as it takes a lot of explaining for me to understand..I have to re-read a lot as I forget...uh..what were we talking about?