petcock issues

[speed_demon_customs]

Ok I need help with my petcock. I have a 85 gs450. Talked to a dealer about my carb leaking and the petcock never shut off, so they said the petcock is bad. I talked to my boss and brought him the petcock and he said rebuild it and when I put it back together that the vacuum for the carb but where dose the vacuum line gose. When I got the. Bike there was no rubber boots to the carb from the air box. If anyone has a diagram that would help out a lot thanks

[koolaid_kid]

Downlaod the Service Manual from here: http://members.dslextreme.com/users/bikecliff/

That should have the info you will need. Best of luck.

[atrent]

petcock

surely someone has a diagram or picture of the break down for these vacuum operated petcocks. My problem is that it won't allow fuel flow on prime. and no there is no blockage in the stand pipes. I have this device dismantled and it looks like there should be some sort of part to manually open the vacuum operated valve when prime is selected.
alex

[Larry D]

Ok I need help with my petcock. I have a 85 gs450. Talked to a dealer about my carb leaking and the petcock never shut off, so they said the petcock is bad. I talked to my boss and brought him the petcock and he said rebuild it and when I put it back together that the vacuum for the carb but where dose the vacuum line gose. When I got the. Bike there was no rubber boots to the carb from the air box. If anyone has a diagram that would help out a lot thanks

I'm not to familiar with 450's, but, there may be something on Cliff's site to help you.

http://members.dslextreme.com/users/bikecliff/

You can also use the search feature and see what you can find.

[Larry D]

surely someone has a diagram or picture of the break down for these vacuum operated petcocks. My problem is that it won't allow fuel flow on prime. and no there is no blockage in the stand pipes. I have this device dismantled and it looks like there should be some sort of part to manually open the vacuum operated valve when prime is selected.
alex

Don't call me Shirley.....

See the post above.

[JEEPRUSTY]

There is a stainless steel or chromed spring inside a plastic cone that presses acts on a tiny metal tube that has an o-ring.

This pushes the tube out from the outer side of the petcock.
The vacuum line attaches on the inside and it draws on a diaphragm that pulls on the o-ringed tube.

[atrent]

petcock

Don't call me Shirley.....

See the post above.

All very good but my petcock is considerably different. If I new how I could post a picture
alex

[BassCliff]

All very good but my petcock is considerably different. If I new how I could post a picture
alex

Hi,

How to post a picture is on my website too.


Thank you for your indulgence,

BassCliff

[posplayr]

surely someone has a diagram or picture of the break down for these vacuum operated petcocks. My problem is that it won't allow fuel flow on prime. and no there is no blockage in the stand pipes. I have this device dismantled and it looks like there should be some sort of part to manually open the vacuum operated valve when prime is selected.
alex

What I find particularly irking is the demanding tone of some posters

[srsupertrap]

It comes from seeing the same questions over & over again. Some are more patient than others but it sure would be helpful to post pics first and ask questions later.

2 cents

[BassCliff]

Hi,

You'll find this on my website. Probably not your exact petcock but it might be helpful.

Petcock Rebuild
(by Mr. Matchless)

Might I suggest that you take some pictures as you work on your petcock so that you can help others?


Thank you for your indulgence,

BassCliff

[Truth]

Is this one guy posting under 2 names?

I had a problem with mine flooding number 2 cylinder when I first bought my bike. Bought a new one $15 I think and was done with it. Not worth the aggravation in my humble opinion.

[FormerBMWguy]

I had the same problem on my 850L- no joy on the "prime" setting at all, but good fuel flow when vacuum was applied to the normal vac port. Nothing apparent was wrong with the petcock, so I took the spring out, put a slightly larger one on the other side of the diaphragm to hold it open all the time, and put a small Briggs and Stratton inline gas valve in the line. No reserve feature, but I just pay attention, and no more wondering when the petcock is going to crap out permanently.

[speed_demon_customs]

no its not one guys under two name some one just jumped on my post. what i am really looking for are pics of how the vacuum hose is from the petcock to the carbs. when i bought the bike there was no tube from the air box to the carbs i need to know where this vacuum hose gose and how its hooked up just going to buy a new petcock, but whats the point if i have no clue how the vacuum line is hooked up thanks for the help

[BassCliff]

Hi,

As far as I know, there is no tube from the airbox to the carbs (unless you're talking about the intake boots). The airbox should have a breather hose connected to the breather port on the top of the valve cover. The vacuum port on the petcock should connect to the vacuum port on one of the carbs. I think the vacuum port is on the #2 carb on your bike. The manual that you downloaded from my website should have more accurate information.


Thank you for your indulgence,

BassCliff