sv650s sputters like it's running out of gas open throttle

[Solafide]

Hi guys i currently have a sv650s that I am test driving and it sputters after like 30+ minutes of riding whenever I full throttle it, like it's running out of gas. I stopped once and topped it off and it stopped then 30 miles later It was at it again. It still cruises ok, but when I braaaap it I feel like this potentially awesome bike is not worth trading for :( and I really want it to be! The guy did mention that it needs a new fuel filter, could that be it? Also he has custom fitted a two brothers exhaust that probably wasn't the exact match exhaust slip on doe his bike he said he had to kinda wedge it in there and there are a few sliver slits in the exhaust pipe itself where said it's leaking... I'm assuming a weld or exhaust wrap could fix elthe back pressure thing.. Any help? I have bike til Friday before we make trade

[maviczap]

Sounds like fuel starvation of some sort or even wet front plug syndrome?

But you don't say which Sv you have & where you are

[Solafide]

sv650s, austin texas

[Solafide]

2005 sv650s austin tx

[Solafide]

And another question, cause my bike is my only ride Ans I really want this one, would it be worth to trade now and repair later in y'all's opinion? The bike will cruise and stop and start right up and then the fuel issue subsides, it's jus like freaky. Like when you meet someone's parent wearing all black and riding a motorcycle and despite what they've heard about you and stuff they are freaked out alittle till they meet ou and relLize you beeZa a good man.

[ophic]

Just wear dayglo textiles. Then the parents will be blind so it won't matter.

[Solafide]

..yeah... :( I'm gonna trade the bike, just rode like 30 miles and it was fine. I just wanna fix the issue cause I wanna braaapp all day! ( i'm switching from a cruiser to this, so its lots of fun)

[Solafide]

How can I fix this?

[DJ123]

How can I fix this?



what are you doing when you go to full throttle? What gear are you in? What revs are you at? Twins will be gutless if you are riding with too little revs in a high gear. The SV powerband doesn't really start till 6-7K.

[Solafide]

I'm just crusing, and then I just open it.. I'll monitor the RPM to gear ratio.. I rode about 30 miles today and it didn't do it.. It just bucks like the same thing when a bike is running out of gas.. Kind violent.

[DJ123]

Gear? Revs? Without knowing what you are doing to the engine it is fairly impossible to help

[Solafide]

Gear? Revs? Without knowing what you are doing to the engine it is fairly impossible to help

48 sproket on back.. I think its 1-3 rd gear that does it randomly it seems,

[Solafide]

its only when I full throttle it too.. and it is seemingly random, also pretty sure I head a backfire on one, there are some slits in the exhaust where the exhaust was... "Custom" fitted into a Two Brothers that probely isnt mean for this SV650 S lol, it sfuel injected

[Solafide]

And, well it does it at 6k rpm or so... probably at all RPMS, sometimes its just one single jerk, sometimes it bucks over and over.

I'm not a cert mechanic but I feel like it might be the exhaust coupled with the high sproket and me of course transfering from a cruiser to sport bike and not feeling it correctly, but how it sometimes does it and then doesnt is weird.. whenever i turn off the bike, and turn it back on it stops ??? :?

[Solafide]

Could using 93 octane when it was meant for 87 possibly affect that?

[Solafide]

Oh yeah and there's a power commander iii under passenger seat, not sure if it's hooked up tho... Maybe that is the source ??

[maviczap]

Sounds like there are more than one issue to your problem, and you'd be wise to take it to a good motorcycle shop to figure out what's going on.

[ophic]

..yeah... :( I'm gonna trade the bike, just rode like 30 miles and it was fine. I just wanna fix the issue cause I wanna braaapp all day! ( i'm switching from a cruiser to this, so its lots of fun)
If your cruiser runs ok then perhaps it'd be better to hang on to it until you find a bike that runs properly. If it's your only transport you need something reliable.

Could using 93 octane when it was meant for 87 possibly affect that?
No. Using fuel higher than the required octane rating is fine.

Sorry can't help much with your issue. If there's a power commander fitted then it could be running a bad map, or there could be electrical issues, or anything tbh. Personally I'd steer clear.

[Solafide]

Well, I'm already committed. The bike runs solid as **** most of the time. This issue can probably be fixed by me, I've done all my own work on bikes in past from modifying the clutches and plates to bobber mods and custom paint rewriting electrical , I'm not a pro, but it's worth a shot to try fix myself if I start eliminating things I'll eventually find it... Just lookin for the right place to start..
Z maybe running a cleaner through the gas before I clean the fuel filter?

Noob me all you want, yeah I know I'm stubborn. Not nessicarl proud of it but it is what it is

[Solafide]

If your cruiser runs ok then perhaps it'd be better to hang on to it until you find a bike that runs properly. If it's your only transport you need something reliable.


No. Using fuel higher than the required octane rating is fine.

Sorry can't help much with your issue. If there's a power commander fitted then it could be running a bad map, or there could be electrical issues, or anything tbh. Personally I'd steer clear.


Thanks for the solid recommendation. Had I read this yesterday I may of done it. Admitely I'm kind of addicted to this bike, have put acouple hundred miles so far and just the one issue runs smooth 100% of the time, 30% it's jumpy when I floor it but acceleration isn't issue it's the sudden burst. Also last night it started happening and I pulled clutch and revved real high and that seemed to fix it cause I burnt out and had wonderful drag race after that haha

[Solafide]

Also turning bike on an off fixed it

[Corny Gizmo]

I might be way off the mark here but have you checked the TPS?

[JohnyMST]

I have similar problem with my 99 SV.

I had my carbs balanced about 3 weeks ago and since then the engine would stall or sputter at 120+ KM/H.

Changed the coils - didn't help. Changed Spark plugs - didn't help.

The bike backfires a lot when I decelerate so that would suggest a lean mixture meaning not enough fuel.

The Mechanic will take a look at it again and will adjust the carbs for more fuel.

I went for a 120miles ride on Saturday with a passenger. It drank only 4 liters per 100km (should be like 6liters per 100 km w/o passenger!). I'm 99% convinced that lean mixture is my problem.

Maybe you should try checking that too?

[Solafide]

Appreciate both the replies!! What's the TPS?

[maviczap]

Throttle position sensors

But I'm a curvy owner, so what do I know :D

[Corny Gizmo]

Its a sensor that controls fuel flow according to the throttle's position. (Or something to that effect) If set incorrectly it can provide to much fuel low down and the bike will bog down, to check it (and adjust) follow this guide... LINK (http://forums.sv650.org/showthread.php?t=55459)

[Solafide]

Ok, so I traded for the bike. Changed the oil and so far everything is great, I have had no sputtering..

Also I found out the guy had it sit like all winter and only rode it like twice during that time, and only rid it once or twice before we traded bikes. So maybe its dusting off?

The key thing here is that it only does it once in awhile.

[Solafide]

I started putting two and two together.. I guess I didn't see it before, but the fuel light would start flashing but when I restarted bike it would go off. I am not sure entirely how this works, but I'm pretty sure I was just running out of gas from flooring it all the time... Although I could be wrong? I think once I came back from a 30 mile trip and it did it anyway, but maybe that time I was in a higher gear than I should of been and tried to throttle it? I am only used to riding 5 gears, so the 6th throws me off. Silly to think that all of this was likely from just running low on gas...

Is there something in the 2005 SV650S that causes the bike to not allow full throttle braaaping whenever the fuel hits the reserve tank?

[Red Herring]

No there isn't.

Given you have just bought the bike and it's been sitting for a while since then I would start by giving the bike a full service, at least that way you have covered the basics.
Change the oil (done I think), new plugs and air filter. Depending on mileage check the valve clearances and the TPS, but also go over all of the electrical connections while you have the tank and airbox off making sure none are loose or corroded. Being in the States your bike might have a different spec emissions system but check the various pipes that go in and out of the air box and down to the engine (PAIR system) and make sure none are loose or leaking.
If that still hasn't fixed it (or you didn't find anything amiss whilst you had it apart) then it's possible that whilst it was left standing the fuel system was allowed to dry out and maybe there are some deposits left behind clogging things up. They fuel system, pump and filters are in the tank so turn it over (best to drain it first...) and take the pump out. There is a strainer that is easy to clean, but if it's clogged or damaged then it will need replacement and best to do the fuel filter cartridge at the same time. If the bike runs sweet some of the time and you're not getting any fault codes on the dash then it's unlikely to be a problem with the injectors themselves.

Good luck.

[Solafide]

Thanks I'll have to play wit this list.. It Alwas runs smooth, and occasionally bucks some when runnig low o fuel when I open the throttle.. I'm gonna go joy ride now and see if after a long ride with full tank it gives me ahit

[Solafide]

Ok update for thi ****e

I am almost 100% positive its an electrical issue.. and probably related to the power commander 3 thats installed, cause that thing is definitely active but i'm still having trouble figuring how to use it.. I messed with it this morning, and then my bike wouldn't start (electricity worked, i heard the spark, but no ignition untill I rolled the throttle lol?) then I turned it off and back on and it worked and rode like a champ through the twisties (HOLY **** SPORT BIKES IN THE TWISTIES IS LIKE BRAAAPIN AMAZIN)

Also, it only sat for 3-4 months max, with two starts inbetween garage kept too, I think he mentioned he had a tender too.. So it wasn't like completely neglected, so I'm assuming corrosion might not be it, but it might be... what you guys gather from this info?

[Red Herring]

Ok update for thi ****e

....... what you guys gather from this info?


That it's quite hard to help someone who describes what they have done as "messed with" ?

Good luck dude, I'm out of ideas and patience.

[Solafide]

I just pressed a few buttons and wiggled it around. That's what I mean by messed with it.