Running a Tank with no vacuum port on the petcock. Will it work?

[GS550Triumph]

Whats up guys. I was wondering if you absolutly need the vacuum petcock to work with a gs550 motor or could i use a petcock with only a open and close? My tanks off a 69 triumph thats why i was asking. Thanks gents

Jeff

[bonanzadave]

Sure. Its just simple gravity. Id try to remember to turn it off when you park it.

[Big T]

Be sure to cap the vacuum port on the carb for the petcock

[GS550Triumph]

Perfect. Thanks guys.

[bwringer]

It'll work fine as long as you have a perfectly infallible brain and always, always, always turn it off when stopped.

The float needles on a GS are not designed to hold back a tankful of gas. They'll make it through a lunch stop OK, but over a day or two they'll slowly seep gas into your carbs which will overflow and trickle into your engine. And that's very, very ungood.

[sparkey]

I left my gs850 on prime and filled up the cylinders with gas. I didn't think too much of it. The gas in turn made its way into the oil and the vapors when hot lit up my airbox on my first test ride this year. (YES FIRE!) It was not fun. I almost burned up the whole bike!!

[GS550Triumph]

geez I was a little to late... Put it on open tried to fire her up no dice, battery died, went back inside and had diner, came out and gas was dripping out of my carb... lol guess ill order one for a gs550... anyone know what thread size / pitch the suzuki uses??