how long can i pin my throttle fully going at max speed without damaging my engine??...

Until the cops catch up to you or you get to the roadblock at the county line...   :lol:
Seriously, you should be able to hold it WFO until you run out of gas (you can still hold it open after you run out of gas if you want to but it begins to have less effect).

:lol:  :lol:  :lol:

Running at constant revs for "long" periods is not recommended but unless you have miles and miles of dead flat straight road it's not likely to be a worry.

Cal,

It's called Nebraska.

Jake

Jake, when you come from a country where a mile straight is a long one and no-one lives more that 100 miles from the coast Nebraska is just a surreal concept.

so there's no engine damage if i run it full throttle for a long long time?

cal,

you should try driving it sometime, that's pretty surreal.  Better yet is montana, they used to have no daytime speed limit across the plains.

jake

Seriously, you should be able to hold it wide open, without fear of catastrophic engine damage, as long as there is a fair load on the engine (ie. holding wide open in neutral is not good) & there is adequate engine cooling going on (so bike needs to be moving fast enough & ambient temps are low enough to get good cooling) & the engine speed isn't too high.
That said, doing this will likely shorten the engine's life.  Engine life seems to be something of an inverse relationship with throttle position (although there are other stronger influences).
Dare I ask why you are interested?

just curious...  :lol:  

what is high engine speed in your opinion??

Do you have a fairing on your GS? Otherwise it won't take long before your neckmuscles are exhausted and you have to slow down. Wind pressure on the helmet is pretty high at topspeed.

I guess that with a correct oil level it won't be a problem. Once in a while I get on the autobahn and then I drive 180 km/h for 10 minutes. It doesn't give engine problems.

The only problem you'll have is oil consumption. I would stop every 100 miles to check the oil or so. Consumption goes up drastically if you ride at high rpm's for a long time.

One other thing to keep in mind if you spend alot of time cruising at high speeds is to keep an eye on your oil level. Mine doesn't use much oil at all normally, but it seems to develop a bit of an appetite for it when I've been riding around at high speeds/revs for a long time.

A few hours at high revs can make the level go down a fair bit with mine anyway..might just be me though.   :dunno: