Is this carb icing? - SV650.org

11-02-09, 04:01 PM

A quick and often asked question..
Fricking cold this morning, but bike started and ran fine. After 10 mins though, every time I let it idle it would stall. Even with lazily slow downchanges.
There is a misfire, but that is constant and unaffected by the weather.
The stalling is only when its very cold.
It was fine this afternoon.
Carby icey?

fizzwheel · 11-02-09, 04:04 PM

Sounds like it was.

northwind · 11-02-09, 05:11 PM

Aye, does sound like it... Only thing to mention is that carb icing can only happen when it's cold but still a bit humid, on really cold or cold and clear days there's not enough water in the air to freeze in the carbs. The best test for carb icing is to wait til its really bad, turn off, wait 2 minutes and start again- if it's gone, then it was almost certainly carb icing, and now the ice has melted.

yorkie_chris · 11-02-09, 05:13 PM

Maybe choke plungers too. Lot of wet and salt to get into the cables.

11-02-09, 08:36 PM

So how does one deal with carb icing?

fizzwheel · 11-02-09, 08:41 PM

A fuel additive such as Silkolene Pro FST or I found running my bike on premium petrol such as Shell Optimax sorted it out as well.

12-02-09, 11:13 AM

I have a mixture of shell optimax (that ferrari stuff) and 100ml of the Pro FST and I have no trouble at all.
I was having the same effects as your bike

12-02-09, 03:08 PM

Been riding around this afternoon trying to get some Pro FST, nobody sells it!
Tank full of BP ultimate is the best I could do, results tomorrow! (fingers crossed)

Viney · 12-02-09, 03:43 PM

Quote:

Originally Posted by doug-read

So how does one deal with carb icing?

Dont go out in the cold!

HTH

12-02-09, 05:16 PM

Just out of interest..... would cold temps drop your Idle speed - in a more air to fuel type thing?

(No idea if it would just curious....)

11-02-09, 04:01 PM	#1
captainsmelly Guest Posts: n/a	Is this carb icing? A quick and often asked question.. Fricking cold this morning, but bike started and ran fine. After 10 mins though, every time I let it idle it would stall. Even with lazily slow downchanges. There is a misfire, but that is constant and unaffected by the weather. The stalling is only when its very cold. It was fine this afternoon. Carby icey?

11-02-09, 04:04 PM	#2
fizzwheel Super Moderator Mega Poster Join Date: Dec 2003 Location: Somerset Posts: 3,614	Re: Is this carb icing? Sounds like it was. __________________ Look Dave, I can see you're really upset about this. I honestly think you ought to sit down calmly, take a stress pill, and think things over. K5 GSXR 750 Anniversary Edition

11-02-09, 05:11 PM	#3
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Re: Is this carb icing? Aye, does sound like it... Only thing to mention is that carb icing can only happen when it's cold but still a bit humid, on really cold or cold and clear days there's not enough water in the air to freeze in the carbs. The best test for carb icing is to wait til its really bad, turn off, wait 2 minutes and start again- if it's gone, then it was almost certainly carb icing, and now the ice has melted. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

11-02-09, 05:13 PM	#4
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Is this carb icing? Maybe choke plungers too. Lot of wet and salt to get into the cables. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

11-02-09, 08:36 PM	#5
doug-read Guest Posts: n/a	Re: Is this carb icing? So how does one deal with carb icing?

11-02-09, 08:41 PM	#6
fizzwheel Super Moderator Mega Poster Join Date: Dec 2003 Location: Somerset Posts: 3,614	Re: Is this carb icing? A fuel additive such as Silkolene Pro FST or I found running my bike on premium petrol such as Shell Optimax sorted it out as well. __________________ Look Dave, I can see you're really upset about this. I honestly think you ought to sit down calmly, take a stress pill, and think things over. K5 GSXR 750 Anniversary Edition

12-02-09, 11:13 AM	#7
vardypeeps Guest Posts: n/a	Re: Is this carb icing? I have a mixture of shell optimax (that ferrari stuff) and 100ml of the Pro FST and I have no trouble at all. I was having the same effects as your bike

12-02-09, 03:08 PM	#8
captainsmelly Guest Posts: n/a	Re: Is this carb icing? Been riding around this afternoon trying to get some Pro FST, nobody sells it! Tank full of BP ultimate is the best I could do, results tomorrow! (fingers crossed)

12-02-09, 05:16 PM	#10
Sosha Guest Posts: n/a	Re: Is this carb icing? Just out of interest..... would cold temps drop your Idle speed - in a more air to fuel type thing? (No idea if it would just curious....)

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