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Help Me Fix It A great place to post any problems you may be having while working on your motorcycle. Most of us are do-it-yourselfers so this is a great way to share any information pertaining to fixing something or adding something on.

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Old 06-14-2010, 03:15 PM   2 links from elsewhere to this Post. Click to view. #1 (permalink)
arcticamt6
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Default Fueling Problems: Suzuki Savage 650

Ok, so my friend has a Suzuki Savage 650 for a first bike and it's having problems on the highway. I'm helping him fix it since he's going out of town for a month. Around town, it'll run fine, but once it's running 60-70mph for a few minutes, it'll sputter and die. It'll backfire a lot as well. I already swapped the gas in it and put some STP fuel systems cleaner in, but it's still doing it.

Am I going to need to pull off the carbs and clean them? fuel filter maybe? Just keep running the new gas/fuel system cleaner? I just don't want to start pulling stuff off his bike.
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Old 06-14-2010, 03:17 PM   #2 (permalink)
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Fuel filter? check it.

Fuel tank vent line?
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Old 06-17-2010, 08:48 AM   #3 (permalink)
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Well, it is only one carburetor, so it couldn't be any easier. But to me it sounds more like a petcock or fuel tank vent issue. My ER-5 did something like that, it ran great in the city, as you never run WOT for extended periods of time. But hit the interstate, and after a while it would die. Riding at 80mph and then lose all the power. It was the tank vent.
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Old 06-17-2010, 08:49 AM   #4 (permalink)
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By the way, the Savage 650 backfires a lot, that is normal due to it being a thumper. Don't try to fix it as there is no way around it (honestly I love the backfiring on my XT660, it adds to the character of the bike, and if I could, I would make the backfires louder!).
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Old 06-17-2010, 08:51 AM   #5 (permalink)
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I'd check the filter and then the vent line in that order, it sounds like it is getting starved which generally means the carbs are fine, something outside of the carbs is causing the issue.

A quick test is to run it with the petcock on prime and see if it still does it.
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Old 06-17-2010, 08:58 AM   #6 (permalink)
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Originally Posted by Tripped1 View Post
I'd check the filter and then the vent line in that order, it sounds like it is getting starved which generally means the carbs are fine, something outside of the carbs is causing the issue.

A quick test is to run it with the petcock on prime and see if it still does it.
Right, and if it continues doing it while on prime, try running it with the fuel tank open, to rule out the fuel tank vent.
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Old 08-03-2010, 01:36 PM   #7 (permalink)
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So I had been neglecting to fix his bike since other stuff has come up. I managed to rule out the fuel tank vent. Everything runs fine on prime, which means that a filter is clogged up. Didn't fix the problem when I ran it normally without a gas cap. Problem is, I'm not really sure where the filter is. Here's the bike bandit schematic, and the filter is listed as number 20, but I can't figure out where in the assembly it is. It just shows it as separate from everything else.

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Old 08-04-2010, 05:47 AM   #8 (permalink)
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Quote:
Originally Posted by arcticamt6 View Post
So I had been neglecting to fix his bike since other stuff has come up. I managed to rule out the fuel tank vent. Everything runs fine on prime, which means that a filter is clogged up. Didn't fix the problem when I ran it normally without a gas cap. Problem is, I'm not really sure where the filter is. Here's the bike bandit schematic, and the filter is listed as number 20, but I can't figure out where in the assembly it is. It just shows it as separate from everything else.

If it runs fine on prime it is not your filter. It sounds like the fuel petcock does not allow suficient flow on the normal position. If it is a vacuum operated petcock it most likely does not open enough. You may be able to take it apart and clean it.
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Old 01-07-2011, 11:02 PM   #9 (permalink)
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Default Faulty Diaphragm on Petcock Probably

Hey, I had a similar problem w/ my Savage 650, and I'm almost 99% sure you've got the same issue.

The diaphragm on the petcock is probably damaged/worn/etc. In addition to what others have said about running it in the PRI/RES position, you can also see if it's faulty by pulling off the vacuum line from the carb. (ie. the other hose on the petcock that's not the fuel hose) If there's any fuel on the tip of the hose, the diaphragm is bad & u'd be better off buying an aftermarket petcock.

Good news, they do make an aftermarket petcock that'll fit the savage for 'round $25, you can find more info on the suzukisavage.com forum.

And as for the fuel filter on the savage, mine didn't have one, so I had to install an external one (the cone-looking types).

Hope this info helps!

cheers,
J
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Old 01-08-2011, 04:45 PM   #10 (permalink)
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from that diagram it looks to me as if the "fuel filter" is a simple screen located just above the float needle.... a lot of them do it that way. you can usually take it out with the float valve seat as its all one unit.... usually... lol good luck
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Old 01-10-2011, 11:32 AM   #11 (permalink)
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Quote:
Originally Posted by Süsser Tod View Post
By the way, the Savage 650 backfires a lot, that is normal due to it being a thumper. Don't try to fix it as there is no way around it (honestly I love the backfiring on my XT660, it adds to the character of the bike, and if I could, I would make the backfires louder!).
My XR650R thumper never backfires as it is jetted properly. After fire (back fire is through the carbs) is caused by a lean condition in the idle circuit or just plain lean condition. Shimming the needle or going to a larger idle jet should help.
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Old 01-10-2011, 04:15 PM   #12 (permalink)
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Quote:
Originally Posted by Veefer97 View Post
My XR650R thumper never backfires as it is jetted properly. After fire (back fire is through the carbs) is caused by a lean condition in the idle circuit or just plain lean condition. Shimming the needle or going to a larger idle jet should help.
A newer bike, with emissions control systems such as a PAIR valve on the exhaust circuit will backfire unless you remove it. You'd have to be dumping lots of fuel into the exhaust to keep it from backfiring.
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