Old 20th December 2009, 09:09 PM #1
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Carb icing ... The facts.

its coming up regular again so to save unnecessary threads ill get some info going here.

carb icing normally happens at temps of +4 to 0 degrees, it can happen at higher temps but normally it will need fog or mist to happen in the +8 to +4 range.
once its actually freezing out the problem tends to go away as the moisture entering the airbox freezes and goes to the bottom of the air-box instead of entering the carbs.
there's some realy good vids of the process happening on a vmax owned by biker.ie member johnpclynch


and


symptoms are typically rough running which gradually gets worse until you have to stop,then bike wont start or struggles to start but if left for 5 mins its back to normal, goes great again but 5 mins or so on an open road and it starts loosing speed gradually again.
lads generally suspect dirt in carbs or a dodgy coil breaking down under heat

a post from mosquito today is very typical of the posts about the subject in the workshop section
entitled " speed dropping"
http://www.biker.ie/forum/showthread.php?t=101913

Originally Posted by mosquito
Well lads,

Having abit of trouble, seems when I'm traveling steadily at 60 to 70 after a few mins the bike would just suddenly out of nowhere drop down to 55-45 and there would be no encouraging it to pick up speed again it just keeps going down gradually so I'd drop her down to forth still no go, so I pull into the hard shoulder and pull in the clutch and then it will just die, and is a cunt to get going again and it's never usually hard to start.. Happened to me about four times on Friday.

The weird thing is I could drive around for hours on roads that I have to keep altering my speed and it wouldn't happen but on a straight line for five ten minutes it will happen without fail..

Any ideas to what the problem is? Minor/Major?

Thanks in advance lads
.............................. .............................. .............................. ..............
the cure....
many manufacturers tried various carb mods , some better than others but none were perfect. the kwackers suffered badly from it thus they modded them by feeding warm coolant to the underside of the float bowls but the skinny pipes and filter often stop the flow so it lets the bike down.
suzuki tried the stupid electrical carb heating method and i doubt it ever worked right .
one thing that definitely does work is silkolene pro fst . the stuffs great and if you suspect carb icing get some straight away .
heres what silkolene have to say.........
http://www.silkoleneoil.com/techtip7.htm


genuine posts of help/queries will be left on this thread ,all the rest will be cleaned out every few weeks .
hope this was of help.
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Old 20th December 2009, 09:18 PM #2
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Re: Carb icing ... The facts.

excellent post , great vids there


based on fact too (which is nice )



never ever ever had it happen ........ ever !


must get a kwacker see what its like
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Old 20th December 2009, 09:23 PM #3
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Re: Carb icing ... The facts.

Originally Posted by chopper
...
suzuki tried the stupid electrical carb heating method and i doubt it ever worked right
...
FWIW, my curvy SV650S is so equipped (with electric carb heating elements), and it has never suffered from carb icing... whereas my VFR400 NC30, ZX9R C1, and ZXR400 all had terrible carb icing issues.
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Old 20th December 2009, 09:27 PM #4
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Re: Carb icing ... The facts.

thanks chopper
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Old 20th December 2009, 09:31 PM #5
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Re: Carb icing ... The facts.

Originally Posted by 2strokey
excellent post , great vids there


based on fact too (which is nice )



never ever ever had it happen ........ ever !


must get a kwacker see what its like
im disapointed with the post

it takes the mystery out of it
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Old 20th December 2009, 09:40 PM #6
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Re: Carb icing ... The facts.

nice one chopper good idea & thread
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Old 20th December 2009, 09:44 PM #7
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Re: Carb icing ... The facts.

Good man Chop.
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Old 20th December 2009, 09:56 PM #8
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Re: Carb icing ... The facts.

Very intresting read!
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Old 20th December 2009, 10:12 PM #9
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Re: Carb icing ... The facts.

that write up on silkolene is quite a good read

i have the perfect bike to try this on,ill report back what happens
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Old 20th December 2009, 10:13 PM #10
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Re: Carb icing ... The facts.

Originally Posted by evoblade
that write up on silkolene is quite a good read

i have the perfect bike to try this on,ill report back what happens
try what on
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Old 20th December 2009, 10:16 PM #11
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Re: Carb icing ... The facts.

this might help people.




supposed to tell ys when your likely to get carb icing
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Old 20th December 2009, 10:17 PM #12
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Re: Carb icing ... The facts.

Originally Posted by chopper
try what on
the silkolene stuff,1 o the bikes has been a pig to start recently and stalled on the rare occasion but cant find any particular reason,ill give it a go hopefully that sorts it
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Old 20th December 2009, 10:18 PM #13
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Re: Carb icing ... The facts.

Originally Posted by evoblade
the silkolene stuff,1 o the bikes has been a pig to start recently and stalled on the rare occasion but cant find any particular reason,ill give it a go hopefully that sorts it
what bike?
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Old 20th December 2009, 10:25 PM #14
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Re: Carb icing ... The facts.

Originally Posted by chopper
what bike?
the silver bros 650,carbs are spotless,clearances are bang on,good strong spark,loads of compression,good battery(left on trickle when not in use),just acts the bollox if its left for a day or 2,once it fires up there's no bother on it and if i use it everyday its grand but on 2 different occasions ive drove maybe 2-3 miles and it'd be runnin grand then stop at the lights it stalled,take a few cranks to get it going then she'd be spot on
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Old 20th December 2009, 10:26 PM #15
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Re: Carb icing ... The facts.

Originally Posted by evoblade
the silver bros 650,carbs are spotless,clearances are bang on,good strong spark,loads of compression,good battery(left on trickle when not in use),just acts the bollox if its left for a day or 2,once it fires up there's no bother on it and if i use it everyday its grand but on 2 different occasions ive drove maybe 2-3 miles and it'd be runnin grand then stop at the lights it stalled,take a few cranks to get it going then she'd be spot on
no harm throwing in a bit of the fst anyway
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Old 20th December 2009, 10:28 PM #16
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Re: Carb icing ... The facts.

great post, i reacon im suffering with this at the mo, pretty hard to start in freezing weather. cheers
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Old 20th December 2009, 10:42 PM #17
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Re: Carb icing ... The facts.

good post, how common is it and is carb icing often blamed for other problems?
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Old 20th December 2009, 10:44 PM #18
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Re: Carb icing ... The facts.

Originally Posted by joe mc gonagle
good post, how common is it and is carb icing often blamed for other problems?
common enough, not realy blamed for other probs as its a very quick fix/cure. bit of fst into tank.

id suspect theres a lot out there that pay for other work to be done when its actualy carb icing .
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Old 20th December 2009, 10:57 PM #19
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Re: Carb icing ... The facts.

Originally Posted by chopper
common enough, not realy blamed for other probs as its a very quick fix/cure. bit of fst into tank.

id suspect theres a lot out there that pay for other work to be done when its actualy carb icing .
cheers
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Old 20th December 2009, 11:08 PM #20
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Re: Carb icing ... The facts.

good stuff

probably still get lads asking why their bike dies in cowld weather though
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Old 21st December 2009, 12:52 AM #21
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Re: Carb icing ... The facts.

anyone know how F4s fare cos me bikes a block of ice
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Old 21st December 2009, 05:01 AM #22
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Re: Carb icing ... The facts.

Thanks chop, anyone know if halfords stock the silkolene stuff??
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Old 21st December 2009, 06:46 AM #23
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Re: Carb icing ... The facts.

Excellent post Chopper
My 'Cat was a bit down in power the last time i had her out and had an occasional misfire below 6,000rpm. It was in the right temperature range for carb icing.
I'll try the FST before anything else...
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Old 21st December 2009, 07:33 AM #24
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Re: Carb icing ... The facts.

Fantastic thread!!!!!

In the situation of a big twin engine, can this than only having 1 cilinder running?

Thanks
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Old 21st December 2009, 08:13 AM #25
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Re: Carb icing ... The facts.

Originally Posted by intruder
fantastic thread!!!!!

In the situation of a big twin engine, can this than only having 1 cilinder running?

Thanks
yes
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Old 21st December 2009, 08:24 AM #26
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Re: Carb icing ... The facts.

Originally Posted by chopper
yes
Thanks a mil
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Old 21st December 2009, 08:26 AM #27
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Re: Carb icing ... The facts.

Great thread...
I limped into work today, time to stock up on ProFST
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Old 21st December 2009, 08:55 AM #28
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Re: Carb icing ... The facts.

Eh... Whats a carb??

do bicycles have them??
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Old 21st December 2009, 08:57 AM #29
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Re: Carb icing ... The facts.

Originally Posted by ardag
Eh... Whats a carb??

do bicycles have them??
before the fuel injection bmw ran a pipe from the cappuchino maker direct to the carbs so they diddnt suffer from carb icing
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Old 21st December 2009, 09:05 AM #30
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Re: Carb icing ... The facts.

Aha! You're a genius! .. That would explain why you could never get the lattes hot enough! .. I think it may have been linked to the sandwich toaster too - the cheese never melted properly!

... Thanks for clearing that up!!

By the way .. on a cautionary note, in these times of recession, these bicycle yokes, are fierce thirsty! .. You need at least twice the normal amounts of beer to run them!

Last edited by ardag; 21st December 2009 at 09:06 AM.
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