Rebuild 1979 gs 850 petcock

[Gorminrider]

...the tiny o-rings on the plunger seal are crucial,IMO... In operation, the plunger wiggles in and out per the vacuum applied from the engine...If the diaphragm seems to be ok , I'd go straight to cleaning the bore out and looking for just the tiny o-ring at the hardware store...I'm not sure "rebuild kits" get this right especially as there's bound to be a teeny bit of wear on the alloy bore too.

Thanks to all for the helpful replies. May take it apart, clean and do the spring stretch thing. If that doesn't work then likely a new one will be bought.Nothing to lose right?

[rphillips]

May be worth taking apart, these things are really simple. Inspect & clean the seat & seal good & stretch the spring just'a little. Many folks around here don't have much luck with rebuilding them, but I've rebuilt several with ebay kits with no problems. This discussion has been around here for yrs. & it seems most around here recommend a new "Suzuki" OEM ( Not aftermarket ) pet cock, & forget about it for the next 15 yrs.... Decisions, decisions, good luck

I tried to rebuild mine and ended up getting a new one. As Cowboy up says rebuilds don't work most of the time. The one I got from Z1 has given me no problems. Had to enlarge one of the mounting bolt holes as it was a 32nd of an inch from fitting properly and i could not get the second bolt to engage the threads. Comes with new gaskets as well.

[cowboyup3371]

Rebuilds don’t work most times so better to get an OEM petcock although Z1 sells a decent one

I have done a search or two but am still wondering. I am restoring a 79 gs850 (hasn't been ridden since 2000).The petcock initially was stuck open on prime. I did manage to get it freed up but after installation the petcock slowly drips in the run or reserve position. I am thinking that I have to rebuild the petcock and find that there are a couple of seals etc available oem for the petcock. Does anyone know what parts I should order or is there a reputable kit that is better? Would rather have the oem petcock setup than an aftermarket one, but may be convinced to order a replacement (aftermarket if a reliable source can be found) if necessary. What is the current thinking on petcock replacement/ repair?