Brand new to riding and brand new to my beautiful '97 Valkyrie Tourer with cobra 6 into 6 pipes - not afraid to read and get hands dirty - replaced lower FR fork tube and seals - front brakes also.
I've spent several hours searching for possible posts with my issue - most have come close but none of the members had exactly the symptoms that I have - so here goes:
THIS IS A LONG POST
Gradual loss of power after cruising at around 60 - 65 mph (around 3k rpm) not right away maybe 10 or 15 min of highway travel. Never occurs at street level speeds.
If I roll off the throttle for 2-3 sec and then roll back on again I can hear just the right side cylinders starting to kick in again. The left side cylinders never have a problem. I do this a couple of times and
some times this fixes it and some time not at all.
Some times rotating the petcock from on to reserve helps but not always. Not sure of the brand of the pet rooster but I'm pretty sure it's after market.
I may have noticed a pattern finally - but still not sure - when I drop to the last 1/3 tank of gas the problem has kicked in. I'm still pretty sure it has done it to me with a full tank but I can't be 100% sure. It just seems that the majority of time it has been at or below 1/3 tank level - I think I'm running out of fuel even though I know I'm not so when I filled it went away but, by then I'm getting off the highway any way. (as I mentioned earlier - it never happens on street level)
One of the previous owners seemed to do a no tank removal de-smog. I heard a screw bounce all over the place one day - pulled over but couldn't find where it came from. Some days later I noticed tubes going to intake manifold 1 and 5 were cut with #5 plugged with a brass screw - did some reading up and found that the #1 should be plugged if it was a poor mans de-smog (source of bouncing screw) so I plugged that and it seemed to work - yet again the problem returned - examining the vent tubes and tube for intake manifold # 3 were "cramped" a little I re-ran the tubes and found the bottom of tube for intake #3 had a worn hole in it. Repaired it and that seemed to do the job - I rode for 40min one way and back again on the highway during a very hot day with no problems... YET AGAIN the problem returned.
So now I am at a loss to explain this. Thought it might be a vapour lock with the hot weather but it did it to me on a nice cool morning.
A month or two after I first got the bike and learning to ride I noticed that when I really hammered down on the gas (in all gears) it would sputter and hesitate before finally kicking in and tearing up the road. A few cans of B-12 solved that - but this present issue just started recently since the good weather hit - not an issue during my commute in the winter months (weather permitting) - I rode her even as low as -12 F one day.
She needed a boost at lunch 
.
The one thing I have noticed after plugging up the leaks - my idle speed doesn't gradually change any more like it used to and now on the highway at 60mph it runs at around 2600 - 2800 rpm where as before it was consistently at around 3100 rpm.
I apologize for being all over the place - just trying to give as much history/info as possible.
Right now I'm going to try some multiple doses of techron and possibly try a new battery (needs one any way - goes dead if the lights are on for more than 10-15min)
After this I'll take the tank off and check the petcock and vacuum hoses etc. Just waiting for Red Eye to come back on line so I can do a proper de-smog.
I'm just confused as to why it's just the right side and why rolling off the throttle for a few seconds and rolling back on again seems to alleviate the problem (sometimes) - ?? giving time for the bowls to fill up ??
Many thanks,
The Hobo
