mentali-juan
Scooby Slapper
Joined: 02 Oct 2008
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tatters
Exxon Valdez
Joined: 04 Jan 2004
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 Posted: 20:27 - 25 Oct 2008  Post subject: |
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Some carbs have heaters in the form of small water hoses from the cooling system or electrical elements on the float bowls, otherwise the bike can suffer from carb icing in very cold weather.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV |
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Whosthedaddy
Super Spammer
Joined: 11 Dec 2005
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Kickstart
The Oracle
Joined: 04 Feb 2002
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| Posted: 20:57 - 25 Oct 2008 Post subject: |
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Hi
Carb icing occurs at low temperatures, but not when very cold. What happens is that the temperature of the carb is cold enough that it freezes the water moisture in the air. When it gets too cold there is not enough moisture in the air to cause a problem.
To be honest it would seem entirely possible for "carb icing" to occur with a fuel injected bike. Indeed possibly worse as going from the pressurised fuel system out the fuel would absorb heat. Countering that is that the fuel is injected under pressure and that the injector (and the cooling it causes) is after the throttle.
All the best
Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
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mentali-juan
Scooby Slapper
Joined: 02 Oct 2008
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Kickstart
The Oracle
Joined: 04 Feb 2002
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Posted: 10:43 - 26 Oct 2008  Post subject: |
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| mentali-juan wrote: | I thought carburated bikes were more prone to carb icing than Fi bikes. |
They are, but not really any particular reason why icing couldn't occur with a fuel injected engine.
| mentali-juan wrote: | My srads didnt suffer when I rode at below or just above freezing conditions. |
Worst conditions seem to be just above freezing when it is foggy.
Is that silkolene stuff any good or waste of my dosh??
| mentali-juan wrote: | What are the symptoms?? |
First symptoms are inability to idle. Likely as it gets worse it will have problems at progressively higher revs. My old FZ750 would refuse to run under 4000rpm and would about double its fuel consumption. Problem would occur with any running at any real speed. Tended not to occur at low speed (30~40 would be fine, but the issue would start within a few minutes of reaching an NSL road). Would clear after a few minutes at low speed (such as caught in traffic, didn't really want to try filtering with it playing up like that).
| mentali-juan wrote: | Dont really want to ride the one and now thinking maybe a dr or old cbr 6 would be better for the winter months. |
To be honest either could suffer. I have had it on a 125 2 stroke (although not that bad, the exterior of the carb was covered in frost), and I would suspect the CBR6 would be fairly easily prone to it.
All the best
Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
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mentali-juan
Scooby Slapper
Joined: 02 Oct 2008
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| Posted: 15:08 - 26 Oct 2008 Post subject: |
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Thanks  |
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