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General Category >> Rubber Side Down! >> Petcock issues or am I just looking for trouble?
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Message started by Greg on 06/25/12 at 07:42:14

Title: Petcock issues or am I just looking for trouble?
Post by Greg on 06/25/12 at 07:42:14

I am wondering if I have petcock issues. Can they be intermittent? Intermittently my idle is low and it stumbles slightly. Intermittently I smell gas. Today I was adding washers to my footpegs. The bike hadn't been run since Saturday. The right side smelled of gasoline pretty bad. Does this sound like a petcock or a leak or is it normal? Since it is intermittent, I didn't think the test in the technical section would be valid.

Title: Re: Petcock issues or am I just looking for troubl
Post by Serowbot on 06/25/12 at 07:49:24

Probably not related,... but, the test is valid, and easy... No harm in checking. Do the test
Then,.. you'll know... ;)...

Title: Re: Petcock issues or am I just looking for troubl
Post by justin_o_guy2 on 06/25/12 at 09:27:07

& make sure the oil is still oil.,

Title: Re: Petcock issues or am I just looking for troubl
Post by wambr on 06/25/12 at 09:43:49

Hi guys! If you had a conversation about the petcockl , here's a question.
I am sometimes at a speed of 70-80 mph on the move stalls the engine. in other modes, this is not happening. When you try to start it I through the transparent fuel filter see that fuel was flowing to the carburetor. so until there was no fuel. This happens periodically. What could be wrong?
p.s. in the petcock I installed a new membrane from the repair kit. the carburetor is clean. the needle valve is in good condition. vacuum line it seems normal.

Title: Re: Petcock issues or am I just looking for troubl
Post by Serowbot on 06/25/12 at 09:54:47

Wambr,... This part in not understood...

3B2D212E3E4C0 wrote:

When you try to start it I through the transparent fuel filter see that fuel was flowing to the carburetor. so until there was no fuel.

I think you are saying petcock is good... but, the symptom does sound like petcock...
Here is the test...
Test your Petcock,.. don't just turn it to Prime.. (http://suzukisavage.com/cgi-bin/YaBB.pl?num=1251932429/1)

Title: Re: Petcock issues or am I just looking for troubl
Post by justin_o_guy2 on 06/25/12 at 10:00:37

Vacuum drops as throttle approaches Wide Open, A stiff diaphragm may not allow full fuel delivery when it is most needed.
If youll run it till it starts to falter & kill it while youre rolling, you can pull over & open the carb bowl drain , catch it, & see whats in the bowl,
Close it off,, put it on prime, give it some time to fill up, put it back on "On", then drain & catch it again & see if theres a difference..

& certainly, do what the Rowboat says,,

Title: Re: Petcock issues or am I just looking for troubl
Post by Greg on 06/25/12 at 10:01:33

756A6C6B7671407040786A662D1F0 wrote:

& make sure the oil is still oil.,

Aside from tasting it or tossing a match, is there an easy way? I made the comment the other day that it appeared that my oil level increased. I just figured it was from a long ride and it was showing in the window a bit more. Maybe not...

Title: Re: Petcock issues or am I just looking for troubl
Post by justin_o_guy2 on 06/25/12 at 10:05:36

The cost of oil versus the cost of an engine? Id drain it,,& then Id take a rag & dip in it & try to light it, If the rag lites right up.,.theres gas in it,
& DO be careful..

Title: Re: Petcock issues or am I just looking for troubl
Post by Greg on 06/25/12 at 10:20:05

I will get some oil and see what I can see. Is it safe to assume that if there is fuel going into the crankcase that there will be fuel in the airbox?

Title: Re: Petcock issues or am I just looking for troubl
Post by wambr on 06/25/12 at 10:22:32

I have does not work when. Yes, I suppose so: fuel thingy does not supply enough fuel into the carburetor at full throttle. diaphragm and o-rings in the valve is new. at that time I still can do?
p.s. even noticed that this happens when the fuel in the tank about half or less.

Title: Re: Petcock issues or am I just looking for troubl
Post by justin_o_guy2 on 06/25/12 at 10:28:29

2421262D2A20430 wrote:

I will get some oil and see what I can see. Is it safe to assume that if there is fuel going into the crankcase that there will be fuel in the airbox?

Its a distinct possibility. NOt necessarily so, depends on how the bike gets parked,

Title: Re: Petcock issues or am I just looking for troubl
Post by justin_o_guy2 on 06/25/12 at 10:56:13

5F49454A5A280 wrote:

Making sure there are no vacuum leaks in the vacuum tubing would be easy,, slap a new piece of vacuum tubing on it.
Do what Serowbot says, he has a complete test for the petcock,

Title: Re: Petcock issues or am I just looking for troubl
Post by wambr on 06/25/12 at 11:13:19

THX guys! i do it some later. now i want to ride. summer is short and need to hurry :)

Title: Re: Petcock issues or am I just looking for troubl
Post by rfw2003 on 06/25/12 at 11:17:12

You can do all the tests, and every now and then keep doing them. Or just change it out to a Raptor petcock. It's simple to do flows alittle better and you will never have the vacuum issues with it. Plus you will have a true off/on petcock.

R.F.

Title: Re: Petcock issues or am I just looking for troubl
Post by rfw2003 on 06/25/12 at 11:18:28

Title: Re: Petcock issues or am I just looking for troubl
Post by wambr on 06/25/12 at 11:31:54

Thanks again! I test a fuel thingy and I will find out the cause.

Title: Re: Petcock issues or am I just looking for troubl
Post by Boofer on 06/25/12 at 19:24:21

wambr, if you find you do need a new petcock, the manual Yamaha petcock can be changed without removing the tank. The Yamaha part number is 5LP-24500-01-00. You also have to plug or cap the vacuum nipple on the right side of the carburetor.

Title: Re: Petcock issues or am I just looking for troubl
Post by wambr on 06/25/12 at 21:55:18

thank you! replacing the fuel valve is not problem. I first try to find the reason and correct the stok fuel shut-off valve.

Title: Re: Petcock issues or am I just looking for troubl
Post by Tode33 on 06/26/12 at 06:45:56

Newbie question incoming:
If the fuel in the oil test ends up positive, (haven't tried it yet, but curious) is that a petcock issue? Or something worse?

Title: Re: Petcock issues or am I just looking for troubl
Post by justin_o_guy2 on 06/26/12 at 07:32:26

Petcock,,

Title: Re: Petcock issues or am I just looking for troubl
Post by Boofer on 06/26/12 at 08:26:18

340F04055353600 wrote:

Newbie question incoming:
If the fuel in the oil test ends up positive, (haven't tried it yet, but curious) is that a petcock issue? Or something worse?

IF you have a manual petcock and fuel is in the oil, it will be the float sinking in the bowl or trash holding the float needle open when the engine is off. The little bowl on the bottom of the carburetor contains the float which regulates the opening of the needle and gives more gas as needed or less if not. Sorry to be so elementary, but some don't understand this.

Title: Re: Petcock issues or am I just looking for troubl
Post by tarkm812 on 06/26/12 at 08:59:18

Just my 2 cents. I was given a '87 Savage last year from my brother who told me he dealt with fuel issues for a long time (stalling at lights, inconsistant idle). He changed the diaphram in the petcock right before I got the bike. I actually had gas pissing out the carb vents while bike was sitting idling on the kickstand. I found this site and took the advice of many and changed the petcock to the raptor. There are no problems swapping it out and have not had a fuel issue since. Cost about $20.00. I'm a believer.

Title: Re: Petcock issues or am I just looking for troubl
Post by Tode33 on 06/26/12 at 09:24:57

Will have to check this tonight, seeing as I just drained the oil. Ordered a raptor over the weekend as a "just in case" fix. So that may work out.