I finally got all three of my bikes in the same spot this morning and did some top-speed runs.

 1995 modified - raptor petcock/straight pipe (maybe, its not as loud as the other straight pipe) has had less and less performance.  Topped out at 58 today.

 1995 all stock except raptor petcock - topped out at 71

 1995 with stock pipe bolted on, then a run with a straight pipe. - topped out at 72 with exhaust, 70 with straight pipe.

 I was informed that a stock savage will do 80-90 but it looks like every one I have is definitely slower than that.  

 Speeds recorded on GPS and tripod mounted radar.

If you're going to be scientific about it,
Elevation, temperature and humidity affect the carburetion.
Different years had different jetting to accommodate the EPA, and I don't know what years had what jets.
Knowing what the wind is doing matters,
How many square inches of frontal area Your body is making it work to drag you through the ocean of air, how you ride matters. The buckhorns invite us to catch a ton of air, the drag bars hold us lower and make getting small easier.

80 to 88 depending on day... uphill, stock pipe/ drilled out stock pipe/ supertrapp. stock filter/K&N. re-jetted of course.  Windshield/sportshield/cut sportshield/flyshield.

And I ain't no light weight.

lets not talk about beast.  

I know you or someone likes to tinker with your bikes, so I don't know the exact gearing or tire sizes for the bikes, but it would appear that your engines only make between 4,000 and 4,500 rpm. Something is very wrong. Either you are in the 300+ pound club or your mechanic doesn't know how to jet a carburetor.

A well tuned bike should be able to reach 5,000 to almost 5,500 rpm. This would yield a top end in the high 80's.

What was the air temp on this day?
What is the elevation?
What are you running for an air filter? OEM or modified. Is the filter clean?
How much do you weigh?
An open pipe will not make enough horsepower. Take the quietest pipe and put it on the faster bike to see if it helps
With stock jetting and a modified pipe, a result in the mid 70's doesn't surprise me.
Due to the taller gearing, a wheezing engine will have trouble turning a tire with a larger circumference. You may find a faster top speed in 4th gear.

I'd suggest that the time has come for you to learn some carb maintenance.

circumference. You may find a faster top speed in 4th gear.

That's something to look at.

ohiomoto wrote on 07/25/17 at 11:49:08:

same wt. but only 6'

just lean a little bit.  

Well, my S40 with the Kawi pulley up front has a top speed in excess of 80mph. Coming back home from Lancer's the speed limit for a good while was 75 mph and at times I was cruising at just under and indicated 80 mph which if I understand Dave correctly, it means I was actually going close to 88 mph because the Kawi pulley and larger back tire cause and approximate 10% error. With myself and gear I estimate bike was loaded with 250-270 lbs. and not I was not going flat out.