[Richard230]

The Pomeroy Dictum isn't intended to be the redline. It is everyday riding rpm guideline for longevity.
A 500 Bullet hits Pomeroy guidelines at 4250 rpm, but it redlines higher.

To answer your question for 73mm stroke and 2500fpm piston speed, it would be 5250 rpm.
At your 9000 rpm redline the piston speed would be 4311 fpm.

A Bullet at 4311 fpm would be at 7300 rpm.

Thanks. I rarely take my BMW past 5000 rpm as that is about as fast as I want to go.

[Karl Fenn]

Well what can you say an urban motorcycle for commuters.

[Karl Fenn]

Well you hardly ever take a BMW to the red line unless you were on a race track.

[Nitrowing]

Well you hardly ever take a BMW to the red line unless you were on a race track.

...because you'd be doing 100mph!

[pgdlkumar]

I did a 1200KM ride over the last weekend and it is hard to stay cruising at 120 kmph, only once I could go at 120 kmph but it stays steady at 100 kmph.  However mileage takes a big hit if you do continuous 100 kmph, if you really are into mileage

[AzCal Retred]

That's our first real-world feedback - Thanks!
How is your bike set up? Gearing stock? Any saddlebags? Windscreen? How was the comfort level after a few hours in the saddle? At 100 KPH, what was the normal MPG? These look like nice machines, how are they to live with?

[pgup]

This rule of thumb is only the tip of the iceberg. It not just mean feet per minute, but also the peak piston speed that is critical. Is there anyone more concerned about reliability than the aircraft industry?
For purposes of rules of thumb, it is generally agreed that for an engine in aircraft service, 3000 fpm is a comfortable maximum MPS and experience has shown that engines having an MPS substantially exceeding that value have experienced reliability issues
Remember that we’re talking about cruising speeds
 For further reading check out this link.
http://epi-eng.com/piston_engine_technology/piston_motion_basics.htm#mps
There is another piston velocity which is used more as a "rule-of-thumb" in engine evaluations. It is called "mean piston speed", which is a calculated value showing the average velocity of a piston at a known RPM in an engine having a known stroke length.
Keeping in mind that every crankshaft revolution, the piston travels a distance equal to twice the stroke length, then Mean Piston Speed (MPS) is calculated by:
MPS (ft per minute)   =   RPM x 2 x stroke (inches) / 12 (inches per foot)   =   RPM x stroke / 6
The Mean Piston Speed at 4000 RPM for the example 4.000 inch stroke engine is:
MPS (ft per minute)   =   4000 x 4 / 6     =     2667 feet per minute.
.
Let’s see if this gets your attention
Note that R / S has no influence on MPS, although it strongly affects peak piston speed (4390 fpm for the example engine {R / S = 1.525} at 4000 RPM).
A rough calculator for peak piston speed is
PEAK PISTON SPEED   =   MPS   X   1.5758               ( ½ X PI)   =  ( .5 X 3.14159)  =  1.5758

[Dexter]

This thread was started last December, before the Meteor was even on most showroom floors. The OP seemed to think a 349 cc engine was designed to be a highway cruiser!

It's top speed is supposedly 70 mph (120kph) and that would be with no headwind on a flat road. Haven't had mine wound up yet, but no one in their right mind would expect this bike to cruise highways all day at full throttle.

[axman88]

This thread was started last December, before the Meteor was even on most showroom floors. The OP seemed to think a 349 cc engine was designed to be a highway cruiser!

It's top speed is supposedly 70 mph (120kph) and that would be with no headwind on a flat road. Haven't had mine wound up yet, but no one in their right mind would expect this bike to cruise highways all day at full throttle.

The average road in India is quite different than the average road in the USA.  If you've seen the Utube videos of the young men doing top speed tests of their machines, while cows and pedestrians amble along the shoulder, you might appreciate this more.

The numbers in this chart are in kph:  https://en.wikipedia.org/wiki/Speed_limits_in_India

It might also be salient to note that the average Indian male is under 5'10" with average weight of 143 lbs. and the average women is 5'4" and 121 lbs.  https://weather.com/en-IN/india/health/news/2020-09-29-national-institute-of-nutrition-changes-ideal-weight-height-for    These figures were just revised upwards this year.  India is experiencing quite a growth spurt. 

I haven't weighed 143 lbs since I was in the 7th grade.   What I find surprising, is that the Indian market buys machines with seat heights over 30 inches.  Our cruisers in the USA can have 80 or 100 horsepower, the rider might weigh 300 lbs, but the seat will be down at 26 to 28 inches.

[GSS]

55 mph works well with no problem. 60 mph cruising is still fine on flat ground with no headwinds. Between 60-65 it will struggle with mild hills and strong headwinds. There is absolutely nothing beyond 70 mph.

The good news is that it remains totally smooth and vibration free at the highest speeds. Very unlikely that you will extract any more speed with sprocket or air filter changes. Give it another year and there will be enough aftermarket options and forum generated tweaks to reliably get this to 85 mph.

This is exactly where we started with the 500cc UCEs and those threatened to vibrate every nut and bolt off the bike at 50 mph