What is the max rpm to run a vl 800 at - 2004 Suzuki VL 800 Volusia

It's running too lean. If you have aftermarket exhaust on it the jetting should have been changed when they were installed. If it wasn't it needs to be.

55 is max (pressure relief)
20 is typical hot engine at 800 idle. and rises as RPM rises.
your post tells neither , temp, or RPM

is this an auto or stick shifted car, ??? we can not guess this, ever.
you said, Gear, that is stick shift and A/T has no gears.
it has, R, D, 1,2,.. selections... are all 4 dead.?
shudders?
starts,
is RPM 800 or more?
you then shift to say reverse...
and step on the throttle , RPM is 800 and it advances to 1500 or more
and car moves,
does RPM go above 3000 and not move
that means , the tranny (or TCM or sensors) are bad.
if your RPM goes to 2000 and is stuck there, and car will not
move in any shifted rage, 1,2,D,L, then the brakes are iced over.
the key to this mystery is RPM. the engine RPM will tell you
what is happening,
for sure.
post it. and we can tell you.

slipping is when the tranny allows RPM to be unlimited at right foot actions.
if the brakes are frozen the RPM will be at the TC clutch stall speed
that is , about 2000rpm max and will shake there. (5sec max doing that)
see the FSM on stall speed, of your A/T
if this is a clutch car, say so, M/T stick car, say so, that be DIFFERENT/

Did the Impeller Pitch Change? Pitch will change the Max RPM, Are you Pulling harder out of the Hole than you did prior? You may have traded Torque for Top End

chec for fuel flow and battery strength-maybe not chargin--buy a haynes or clymer manual--library sec629 has troublshootn books also

If it sounds like an "angry sewing machine", that is normal.

You will notice it even more if you put a windshield on your bike.

Ed
2003 VOL

my 2001 vl 800 speedometer will not work along with odemeter everthing else works but that<!-- from fixya rte -->

How many miles on the bike? How many owners? How complete is the service history? Does the noise happen when the bike is stationary or moving or both? Are all the fluids at the correct levels (water, oil)?

Have the alternator bearings checked.
Also the starter drive clutch.

you will find there may have been water in tank which will only go through system when tank is empty 250ml of metholated spirits in to fuel tank WITH petrol should solve problem as metho evaporates water