'01 SV650s cutting out when blipping throttle and backfiring

[davebullet]

Are you running with an empty tank or near empty tank? Taupo is cold and the moisture in a near empty tank could condense on the inside, (or even icing) then defrost, goes into fuel and presto. Try running with a full tank for a while to minimise condensation from the inside.

Other option is are you parking it in the rain and is the water seeping in through the cap or surround somehow?

[DarkLord]

I usually just run it continually until the fuel light goes on, however that Fuel Set stuff mentioned by TimeOut seems like a good idea too, meths is apparently useless when it comes to removing water. I will have a chat with the mechanic tomorrow morning and see what he thinks. I do wonder if it is condensation or something as it is frickin freezing round here at the moment and these problems have only started recently.

It lives in the garage at night but it is outside during work hours and it was raining last week so that could be an issue as well. However I've ridden it in the rain before and this hasn't happened so I have a feeling it is probably to do with either moisture in the air or dodgy fuel. The last time this happened, I filled up at Gull previously and my most recent fill up was also at Gull. Needless to say I will have to go elsewhere from now on!!

[DarkLord]

Had it checked out this morning - sure enough, the fuel tank was full of water. I reckon probably close to about 100ml in total. The tank was drained, thoroughly cleaned out and airblasted and the bike has run fine ever since. Could well have been that when it was last cleaned out, not all of the water was removed, however it is impossible to tell. Hopefully that is the last of it and it was just a dodgy bit of fuel and not any leakage on the bike itself. Many thanks to Katman for his time this morning (it wasn't him who cleaned it out the last time this happened).

[BigOne]

Had it checked out this morning - sure enough, the fuel tank was full of water. I reckon probably close to about 100ml in total. The tank was drained, thoroughly cleaned out and airblasted and the bike has run fine ever since. Could well have been that when it was last cleaned out, not all of the water was removed, however it is impossible to tell. Hopefully that is the last of it and it was just a dodgy bit of fuel and not any leakage on the bike itself. Many thanks to Katman for his time this morning (it wasn't him who cleaned it out the last time this happened).

I had a SV650K2, and it suffered from carb icing in winter conditions anytime the temperature went below about 4deg, when it was misty or a little foggy as well. Usually on very cold foggy evenings, or mornings. Symptoms were engine cutting out or running on one cylinder briefly, esp. if I changed throttle setting, such as changing down. When really bad, the engine would die, and only re-start after 2-3min.
The water gets in the tank from parking in rain, or washing the bike, around the fuel cap. Look, and you will see there is a drain tube down thru the tank, from the deep dish below the gas cap. It exits to an external tube at the rear under the tank.
If the long drain hose gets kinked or whatever from raising the tank, or removing the tank and not re-installing the hose properly, the hose does not drain the cavity below the gas cap, and it fills with water.
The water runs into the tank when you raise the cap. The answer is simple, route the drain hose carefully from the outlet stub at the tail end of the tank.
Carb heaters were available as an option for some European models, but I could not find any in NZ. It won't be Mr. Gulls fault.
I just lived with the carbs icing sometimes. Water in the fuel certainly won't help. You can get additives for fuel that help prevent icing, (ice from atmospheric conditions, rather than in the fuel) they are added to fuel for some aircraft that run on pump petrol, such as home-builts with car engines. Have a look on pilot or constructors forums, perhaps.
I only ever suffered icing in cold Hi-humidity conditions, as above.
good luck.

I still have some SV650 bling, PM me if you are interested.

[kevie]

[QUOTE=DarkLord;1129785220] I am wondering if water is leaking in through the fuel cap or something. QUOTE]

Are you fueling up at the same service station all the time? the water may be comming from their tanks, common in some of the smaller stations that havent had new tanks installed yet. One of the Marton service stations is notorious for water in the petrol.

[scroter]

have I seen you in the mornings sometimes on a silver sv heading to lake taupo christian camp?

[DarkLord]

Yup that would be me..... I'm usually leaving Taupo about 8am.

I haven't filled up at the Gull station since and the bike has been out in the rain as well as ridden in the rain, yet I have had no problems whatsoever with water in the fuel, despite the fact we have had some atrocious weather recently.

Me thinks I shall stick with BP etc from now on.