78 gs1000c petcock nightmare

[Guest]

Hi Everyone this is my first post so please be patient and let me know if i am doing this right.My 78 gs1000 c petcock only works on reserve and then it will not provide enough gas to keep up with the throttle-checked the cap,vaccum line -removed the petcock and cleaned interior-strecthed the spring a bit like a mechanic friend suggested-still no better flow-you can see the fuel slowing down and speeding up with gas line removed.Now the vaccum line seems to suck too much air also-What is best next step please?

[tkent02]

Just replace it. Not worth messing with. Z-1 Enterprises has good ones fairly inexpensive.
Welcome to the forum.

[Baldmike721]

Thanks!! Didn't know where to find one thats not hundreds of dollars!! I appreciate the help! And thanks for the welcome too!

[Big T]

is you tank at least 1/2 full of gas?

What happens when you put it on Prime/

[azr]

Just keep in mind the one from Z1 that fit your bike have the outflows pointing toward the seat so your fuel line will have to be a lot longer in order to make the bend back towards the tank. It can work though. I bought one from them for an 850, it only lasted 3 yrs

[sedelen]

Use one for a '77 GS750, hoses will be a little tight, but it will work, Chuck Hahn can give you the details better than I can.
It's an not as expensive alternative to replacing that 1000 petcock with a new 1000 petcock, cost prohibitive.