There has been some discussion on underinflated tires from the dealers, it's far too common than it should be. It's not just a Yamaha trait either, lots of Burgmans have been sent out lacking air.
Judging from what I've read around here, most people run factory recommended pressures.

For my sportbike I run it well below what Kawasaki says since its well known to bikers running stock psi will lead to a serious accident. I am using 33/35 on the bike while Kawa suggests 39/42 which is insanity.

Can you please elaborate on the tire pressures for sport bikes comment. I've never owned a sport bike but take great interest in them and have never heard that before.

 

Its traction and the ability to lean easily in corners is why the vast majority of sportbike riders do not inflate to recommended psi.


The lower the psi the better craving corners.

I am 33/36 or 32/35 on my Ninja.

 

From what I hear, and take it with a grain of salt, the recommend pressure for motorcycle and maxiscooter tires is usually given with an eye both at safety under normal conditions and good tire wear. The safety factor assumes you obey the speed limit, accelerate moderately, and most importantly don't ride turns hard.

For me on my Burgman 650 I run at suggested pressure and it seems right for good control and comfort.

NHTSA Link: Motorcycle Tire Safety Tips

 

What is correct pressure?Pirelli and Bridgestone say it's different than Suzuki does.If someone really knows the best pressure,wish they would post it.

 

I think the correct pressure is how the bike feels to you while riding. With the bridegestones I ran them at the recommended 2 up setting while the Pirellis I found suitedME better running 30 front 36 back

 

I got dreaded Dunlops on mine. On a lot of bike forums they are referred to as Dunslops.

Huh, maybe at my 600 service I should swapped them for the better tires. Any suggestions?

 

I run mine at the recommended two up pressure. 33/41

The back tire I let go sometimes until it's down a few pounds, (it's hard to get in there anyway), but the front tire needs 33, or else I find the steering gets a little mushy feeling at slow handling speeds.

 

Can you please elaborate on the tire pressures for sport bikes comment. I've never owned a sport bike but take great interest in them and have never heard that before.

It's based on the idea that racers run lower pressures - but for them it's to build up heat quickly in their tyres for short races - assuming it's a race using street tyres.

It's not a good idea for street bikes in general, more an urban myth for boy racers.

Check the tyre manufacturers web sites rather than believe bike makers...

 

Not sure if it's the same for motorcycle tires, but I read an article in today's paper by one of the local car guru's, and he said that the pressure stamped into a tire is the maximum safe pressure to run the tire at, and that the manufacturer determines the pressure that is best for the vehicle based on the size and profile of the tires that are designated for it.
Like I said, not sure if that also applies to motorcycles.

 

Not sure if it's the same for motorcycle tires, but I read an article in today's paper by one of the local car guru's, and he said that the pressure stamped into a tire is the maximum safe pressure to run the tire at, and that the manufacturer determines the pressure that is best for the vehicle based on the size and profile of the tires that are designated for it.
Like I said, not sure if that also applies to motorcycles.

Yeah, the pressure on the side of the tyre is a maximum, not a recommendation...

I had a full post typed up and lost it...sorry. Basically I'd trust the tyre maker over the bike maker because they are more focused on the tyre's handling/wear where the bike maker might be happy to compromise in the name of a soft ride (for instance).

In any case the bike makers recommendations become mute if you fit anything but the OEM tyre.

 

Can you please elaborate on the tire pressures for sport bikes comment. I've never owned a sport bike but take great interest in them and have never heard that before.

It's based on the idea that racers run lower pressures - but for them it's to build up heat quickly in their tyres for short races - assuming it's a race using street tyres.

It's not a good idea for street bikes in general, more an urban myth for boy racers.

Check the tyre manufacturers web sites rather than believe bike makers...

I found This Article that touches on lower pressure for street riders.