SuzukiSavage.com - petcock? fuel line? cold weather?

Routy

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Re: petcock? fuel line? cold weather?
Reply #30 - 11/20/09 at 04:38:09

justin_o_guy2 wrote on 11/19/09 at 18:43:07:

Every time Ive checked them theyve been looser than when I set them. The little adjusters smack on the valves & theyre pointy. Thats why I adjust as tight as I can & still stay in spec. That way, the cam doesnt get such a running start to smash them against the valves.

Thanks.
And good logical thinking.
Like most times in a valve train, where theres noise, there's friction, and where there's friction there's wear Sad

Not hard to remember the pushrod solid lifter days,....always adjusting

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Rich
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Digger

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Re: petcock? fuel line? cold weather?
Reply #31 - 12/17/09 at 20:49:58

Routy wrote on 11/16/09 at 06:44:43:

......As w/ any carbed engine,....anytime the engine runs fine at higher speed speed, don't blame any part of the "main fuel delivery system" for idle or low speed problems !
That fact will never change,.....sorry.

Unless you're talking about a vacuum operated petcock that is leaking fuel into the intake manifold and causing a rich condition.

Higher engine speeds will tend to mask the condition due to the fact that intake vacuum goes down and, thus, less fuel gets sucked into the intake.

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Digger
2001, Metallic Glacial Blue, Raptor Petcock, Verslavy (first hole) (otherwise, mechanically, the bike is stock), 13,xxx miles
I don't own a cage.
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Routy

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Re: petcock? fuel line? cold weather?
Reply #32 - 12/19/09 at 06:26:33

Digger wrote on 12/17/09 at 20:49:58:

Routy wrote on 11/16/09 at 06:44:43:

......As w/ any carbed engine,....anytime the engine runs fine at higher speed speed, don't blame any part of the "main fuel delivery system" for idle or low speed problems !
That fact will never change,.....sorry.

Unless you're talking about a vacuum operated petcock that is leaking fuel into the intake manifold and causing a rich condition.

Higher engine speeds will tend to mask the condition due to the fact that intake vacuum goes down and, thus, less fuel gets sucked into the intake.

Very probable.
But I ain't figured out how that counterdicts my statement, or if it was meant to Huh

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Rich
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Serowbot

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Re: petcock? fuel line? cold weather?
Reply #33 - 12/19/09 at 09:15:30

What Digger is saying, is when the vacuum diaphragm leaks,... the symptoms are most apparent at high vacuum conditions... which is at idle and low speed steady cruise...
At Wide open throttle, vacuum is close to zero, and so, very little gas is sucked down the vacuum line directly into the intake... so no symptom at full throttle...
Let off the gas,... vacuum goes way high and gas is drawn down the vacuum tube, and the bike stumbles rich...
Full throttle,... no symptoms
Low speed and idle,... stumbling, dying, backfires...
Wink

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Ludicrous Speed !... ... Huh

...

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RidgeRunner13

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Re: petcock? fuel line? cold weather?
Reply #34 - 12/19/09 at 10:39:27

And even if everything is functioning properly, the vacuum controlled petcock can cause you to run lean under high load conditions. If you are running 65-70 into a 30 mph headwind, you're pretty much wot with little vacuum left to keep the petcock open. I checked this with a gauge teed in & taped to my gas tank. I always run in prime & at the first sign of a drip from the carb, I replace the needle & seat. Seven years + & I've never had a problem.
I do think I'll get a raptor petcock though because at the price it's easier than modding the oem. Cool

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Routy

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Re: petcock? fuel line? cold weather?
Reply #35 - 12/19/09 at 17:17:14

Serowbot wrote on 12/19/09 at 09:15:30:

What Digger is saying, is when the vacuum diaphragm leaks,... the symptoms are most apparent at high vacuum conditions... which is at idle and low speed steady cruise...
At Wide open throttle, vacuum is close to zero, and so, very little gas is sucked down the vacuum line directly into the intake... so no symptom at full throttle...
Let off the gas,... vacuum goes way high and gas is drawn down the vacuum tube, and the bike stumbles rich...
Full throttle,... no symptoms
Low speed and idle,... stumbling, dying, backfires...
Wink

Yes I understand all of that, and not a problem, except that my post was included in the quote as if his post counterdicted mine, which is doesn't and I guess was not meant to.

Mine only pertained to the several posts here that believed a plugged petcock screen, or fuel filter could be causing a low speed lean or fuel starvation problem, while running fine at higher speeds.

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Rich
'07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055)

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Rocco Serious Thumper Offline addicted 2 riding TcB Posts: 1049 south florida Gender:	Re: petcock? fuel line? cold weather? Reply #36 - 12/19/09 at 21:03:44 hmmm makes sense! she stalled again 2nite bad, but i had the idle low, and it was about 40 degrees colder then it usually is! i cleaned the petcock screen(red rocket popsicle thingy) but i'm not sure if this was a weather problem or what!
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MMRanch

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Re: petcock? fuel line? cold weather?
Reply #37 - 12/23/09 at 21:29:05

I'M HAVING A SIMULAR PROBLEM SINCE COOL WEATHER SET IN. I THINK ITS DUE TO THE ALCHOL IN THE GAS BECOUSE I ALLREADY HAVE A RAPTURE SHUT-OFF VALVE AND HAVE DOUBLE CHECK THE TIED OFF VACUME LINE ( BOTH ENDS).
AFTER I STOP MOVING AND THE ENGINE IDLES FOR A FEW MINUTES WITHOUT AIR FLOW COOLING , THINGS RETURN TO NORMAL.

ANYONE ELSE THINK FUEL IS THE PROBLEM ???

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Serowbot

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OK.... so what's the
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Re: petcock? fuel line? cold weather?
Reply #38 - 12/23/09 at 21:58:42

If you can shut off the rapture,... I'd sure appreciate it... Huh

Quote:

AND HAVE DOUBLE CHECK THE TIED OFF VACUME LINE ( BOTH ENDS).

are you sure you get this concept?... If you have a "Raptor" petcock,...there's only one place to cap off...
that would be,.. blocking the air tap on the carb... is that done?... if not, you will suck air and run lean...

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Ludicrous Speed !... ... Huh

...

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Rocco Serious Thumper Offline addicted 2 riding TcB Posts: 1049 south florida Gender:	Re: petcock? fuel line? cold weather? Reply #39 - 12/24/09 at 15:20:13 i lowered the idle, and she's running good 2day, the starter made a funny noise a couple of times but didn't do it again. my friend is gonna check for air leaks, and eventually i'll do a raptor. just glad i have backup on here !!
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: petcock? fuel line? cold weather? Reply #40 - 12/24/09 at 21:32:24 What kinda RPM you suppose its idling at, now that you lowered it a bit?
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MMRanch Serious Thumper Offline Evil flourishes if Good Men do Nothing. Posts: 5835 LYNCHBURG TN Gender:	Re: petcock? fuel line? cold weather? Reply #41 - 12/25/09 at 23:03:02 Your right Serowbot "One end capped" I stand corected. Bike still sputters on 10% alchol and cool weather.
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Rocco Serious Thumper Offline addicted 2 riding TcB Posts: 1049 south florida Gender:	Re: petcock? fuel line? cold weather? Reply #42 - 12/27/09 at 12:50:15 uuuum well, instead of a machine gun it's kind of badum...badum...badum instead of budumbudumbudumbudum i know that is no help, but before it didn't sound like she slowed down when i was @ a stop, now it does, and she growls alot more when she's lower idle(which i like) =]
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Digger

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Re: petcock? fuel line? cold weather?
Reply #43 - 01/04/10 at 19:17:05

Routy wrote on 12/19/09 at 06:26:33:

Digger wrote on 12/17/09 at 20:49:58:

Routy wrote on 11/16/09 at 06:44:43:

......As w/ any carbed engine,....anytime the engine runs fine at higher speed speed, don't blame any part of the "main fuel delivery system" for idle or low speed problems !
That fact will never change,.....sorry.

Unless you're talking about a vacuum operated petcock that is leaking fuel into the intake manifold and causing a rich condition.

Higher engine speeds will tend to mask the condition due to the fact that intake vacuum goes down and, thus, less fuel gets sucked into the intake.

Very probable.
But I ain't figured out how that counterdicts my statement, or if it was meant to Huh

Sorry, but I DID mean to disagree with your point as stated in the quote.

I was considering the petcock as part of the fuel delivery system. The petcock DOES have a failure mode that will manifest itself as poor low rpm engine operation, leaving high rpm operations relatively unaffected.

However, I saw a few posts ago that you were referring to a fuel delivery blockage problem in your statement. If that was the case then, yes, I agree with your statement.

Ride safe! Wink

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Digger
2001, Metallic Glacial Blue, Raptor Petcock, Verslavy (first hole) (otherwise, mechanically, the bike is stock), 13,xxx miles
I don't own a cage.
www.astronautbiker.com

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Rocco

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Re: petcock? fuel line? cold weather?
Reply #44 - 01/07/10 at 08:02:02

so my friend thinks i may have an air leak somewhere between the carb and engine(the only place for an air leak right?)

but i'm still not sure, he's gonna see if he can find it. if not maybe i'll just throw a raptor petcock on there IF someone has one and would be so kind as to TELL ME HOW TO DO IT lol then i shouldn't have a problem.

what happens if u 4get to turn the petcock off and it sits over night?

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'95 bobber rat...i guess it's a "bat bike" haha flat black mostly, bare metal tank, header wrap, always a work in progress !

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