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Message started by Scummer on 05/22/11 at 14:13:09

Title: Fueling issues and completely stumped
Post by Scummer on 05/22/11 at 14:13:09

Soooo... where do I start.
Changed the spark plug, so I had to remove seat and tank. No problem, fairly easy, nothing special. Fuel hose disconnect and vacuum line disconnect for the petcock, electric disconnect and tach disconnect and voila, the tank pops off.
Old plug out, new spark plug in, put tank back on, connect all connectors, speedo cable, fuel and vacuum line, put seat back on and vroom.. bike starts up like a charm. Purrs like a kitten. Sweet.

Test ride goes good for about 3 miles when all of a sudden the exhaust starts popping just the same way when I run out of fuel and have to switch the petcock over to reserve. More popping and poof, engine shuts off. :-?

Try to start it back up to no avail, switch the petcock over to prime, wait a bit and vrooom... bike starts back up. :o
Switch petcock back to On and continue my marry way. Another 1 or 2 miles and pop, pop, pop, poof.. engine shuts down again. :(

So, now I switch the petcock over to prime and leave it there and ride home.

Petcock back in On position I remove the fuel line from the carb, remove the vacuum line, suck on the vacuum line and fuel starts to flow out of the fuel line. Uhh... what the heck? Ok.. put everything back together, petcock into prime position, start the bike, petcock back in on position, another test ride, same result. Carb runs out of fuel and bike dies.
This time I only remove the fuel line, start up the bike, and watch fuel flowing from the fuel line in a nice stream. At that point, I'm completely stumped. So I have fuel flow whenever there is a vacuum on the vacuum line, but the bike dies in that position and runs only well in prime position. WTF is wrong with it? At that point, I'm almost inclined to just switch the petcock to prime everytime I want to ride, but it's eating me up as I like to have my stuff function the way it's supposed to function.

Anyone else experienced such a problem before? I really don't know what to do anymore besides switching out the petcock or just switch to prime position without having the reserve switch when i need it.

Thomas

Title: Re: Fueling issues and completely stumped
Post by BurnPgh on 05/22/11 at 14:16:11

replace the vac line or buy a petcock from a yamaha raptor660 and never have to worry about it again. It pretty much happens to every one on the forum at one time or another.

Title: Re: Fueling issues and completely stumped
Post by OE on 05/22/11 at 19:16:47

You might want to check the vacuum port on the carburetor and make sure it's clear into the throat of the carb. You might have stuffed something into the nipple when you put the vac line back on. A small piece of wire will work. Disconnect the vac line from the petcock and blow into the carb. The Raptor petcock fix is simple, two screws in and out and plug the vacuum nipple.

Title: Re: Fueling issues and completely stumped
Post by Scummer on 05/23/11 at 10:01:11

The funny part is, when I disconnect the vacuum hose and have the bike idle, I can feel a nice strong vacuum coming from the carb. Yet, it seems like it's not enough to enable the full flow of gas. Maybe it only lets 50% through and eventually the carb will run out of fuel because it's not getting enough.

Nonetheless, today I've been riding it with the petcock set to prime and the bike runs like it should. I just switch to the on position once I'm done riding.

Really weird.

Title: Re: Fueling issues and completely stumped
Post by OE on 05/23/11 at 12:12:58

Probably not the cause since it's running on prime but I'd check the screen on top of the petcock. Same thing if you have an inline filter, replace it. If the vacuum line is in good shape and sealed tightly at both ends with clips the problem has to be in the petcock. Doesn't sound like anything you've done could have caused the problem but stranger things have happened.

You don't have any signs of gas when you disconnect the vacuum line at the carburetor do you?

Title: Re: Fueling issues and completely stumped
Post by Scummer on 05/24/11 at 09:01:45

0301252020293E4C0 wrote:

Title: Re: Fueling issues and completely stumped
Post by Serowbot on 05/24/11 at 09:09:47

How to check your petcock,... (http://suzukisavage.com/cgi-bin/YaBB.pl?num=1251932429/1) ;)...

Title: Re: Fueling issues and completely stumped
Post by OE on 05/24/11 at 11:06:59

4070667E7E7661130 wrote:

[quote author=0301252020293E4C0 link=1306098790/0#4 date=1306177978]Probably not the cause since it's running on prime but I'd check the screen on top of the petcock. Same thing if you have an inline filter, replace it. If the vacuum line is in good shape and sealed tightly at both ends with clips the problem has to be in the petcock. Doesn't sound like anything you've done could have caused the problem but stranger things have happened.

You don't have any signs of gas when you disconnect the vacuum line at the carburetor do you?

When I disconnect the vacuum line, the carb runs empty after 1 minute or so and the engine shuts off. That should be the normal operation with the petcock in On position.
Or did you mean, actual gas coming out of the vacuum line? Because that is also not the case.[/quote]
Yes, that's what I meant. With the engine running, pull the vac line off the carburetor and if any gas runs out there's a hole in the diaphram in the petcock. No gas, then that's not the problem.

At any rate, there's still something restricting the flow through the petcock when it's on or in reserve and it needs to be replaced. I'd go with the Raptor. It does make the tank easier to remove.

Did you check the screen?

Title: Re: Fueling issues and completely stumped
Post by Scummer on 05/24/11 at 12:37:09

No, I haven't checked the screen yet. I guess that's next.