I wrote a few days ago about a problem with my bike dying at about 70 mph.  Thank you to those who had input and after reading it, I think I have a float adustment problem.  Riding today on a straight away (San Mateo Bridge for the locals) the bike consistently lost power, like it was out of gas, at around 70.  When this had happened in the past I pulled over and got it restarted after a rest and all was fine.  Today though, I switched to 'Prime' when it started to die and the bike regained power and ran like nothing happened.  This seems like a gas starvation problem when there is a high demand - probably the float adjustment right?

I plan to take 'er apart this weekend.  I ordered a few carb rebuild kits and jets to make the 40/125/1 washer modification for idle speed problems.  I will also re-shim the vavles if needed.  Is there anything else that may be causing this problem?  Should I replace the fuel lines or anything else like that?  I did clean the in-tank filter about a month ago.  

Thanks again-
The help on this forum is AWESOME by the way-
jake

Could be a vac problem. Did you check all your vac line connections and make sure you replaced all the O-Rings when re-building carb?
I lost the tiny O-ring on the top carb cover, and this caused a major vac stalling problem for me.

That is possible - would the little 'O' ring come with a carb. rebuild kit?
thanks,
jake

The floats don't care whether they get gas using PRIme or ON.  So I doubt it's the floats.

Differences between PRI and ON:
-ON needs good vacuum (there are many possible causes of vacuum problems)
-fuel drains from the tank using different inlets (in-tank petcock and valve assembly)
-ON and PRI fuel use different hoses to get to the ON/PRI petcock
(pinched hose under the tank?)
-possible rip in the ON/PRI petcock diaphragm affecting one and not the other

From the ON/PRI petcock on down to the carbs, it's just gas: anything that affects ON should affect PRI also.

Could be a vac problem. Did you check all your vac line connections and make sure you replaced all the O-Rings when re-building carb?
I lost the tiny O-ring on the top carb cover, and this caused a major vac stalling problem for me.

Could be your petcock diaphram is dying. That happened to me about this time last year. Took me awhile to figure it out. I replaced the factory vacuum unit with a good old-fashioned mechanical petcock and haven't had any trouble since.  

I gotta go with the vaccum problem (or related diaphram in fuel valve). As you open the throttle the manifold pressure increases, thus the vacuum decreases. Any small vacuum leaks will not show up at low throttle openings because the vacuum is so high, however, as the throttle is opened the vacuum decreases so even a small leak (in the hose, carburetor o-ring, or valve diaphram) will cause enough vacuum leak to close your fuel valve.

See if the bike runs ok on 'PRIME'.

Thanks to all again.  
I did find the petcock diaphram to be a bit fragile upon disassembly and probably wasn't as careful as I could have been with it.  If anyone has the Clymer manual -- is the small O-ring that is easy to lose part #31 on the diagram on page 244?  It looks like this fits under the caps for tuning the carbs, is that correct?
Thanks,
jake

That's the sucker I mentioned before ....such a little bastard, all causing problems and whatnot :x