CV carb in winter time
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Road Captain
Joined: Aug 2010
Posts: 616
Likes: 38
CV carb in winter time
Is it just me or does anyone else who has the cv carb noticed when the winter blend fuels start coming in the fall the bike does not run very well. It happens to my bike runs great in the summer but winter time its awful mileage goes down and it really doesnt perform well. What can be done if anything?
Tourer
Joined: Nov 2011
Posts: 421
Likes: 4
From: Alabama
Yep, sure noticed it with mine. When I got it, was warm & it ran great. Soon as it cooled off, it started with a part-throttle miss & backfire on throttle chop. I thought it had more to do with density of cold winter air causing a lean run problem, than winter fuel blend, so I swapped the 45 slow jet for a 48, and that seems to have cured my winter runability issue. When it warms up, I'm figuring I'll have to switch back to the 45, or run over-rich.
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Road Captain
Joined: Aug 2010
Posts: 616
Likes: 38
thats a possibility i have a 46 jet i can try in it and see if that helps it. I know yesterday on the interstate about 50 degrees it was popping every so often and im about to get tired of that for sure
Tourer
Joined: Nov 2011
Posts: 421
Likes: 4
From: Alabama
I went to a 46 first from the OEM 45. And that did help a bit, but didn't cure my prob, particularly if temp is below 45 or so. So I hopped on up to a 48 and that seems to have cured it. I rode to work at 35 F last week and no miss/backfire. So far, so good. You might pop a 48 in & see what happens. Only a couple of bucks, & less than an hour of your time if you can pull the bowl without removing the carb. I never could. You'll have to readjust the mixture screw & idle speed, however. At least I did. Good luck.
Tourer
Joined: Oct 2010
Posts: 310
Likes: 1
My '93 fxdwg runs pretty good in cold weather.I went for a ride today and it was 38 degrees.45 slow jet, 175 main and .030 shim under the stock needle and two turns on the air/fuel mix screw.Most imortantly I let it warm up for 5 minutes before taking off.
Tourer
Joined: Nov 2011
Posts: 421
Likes: 4
From: Alabama
To get my Vibrator to run worth spit in the cold, I have to run a 48 slow, 195 main (which is stock), .043" raised stock needle (two #4 washers), and 3 full turns out on mixture screw. And my AC & exhaust are stock (well, nearly stock). I figgered it was way, way too lean when I got it cause it ran what I thought was very hot, and the plugs were white as snow & blistered. Seems to be running a bit cooler now, and definately don't miss the miss. To be perfectly honest, however, can't tell much diff in the performance, other than the now-missing miss.
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Tourer
Joined: Sep 2007
Posts: 383
Likes: 1
I run a 48 slow year around in my RK. When the temps get down below 50 she coughs quite abit back through the ac, Drives me nuts. I would say the cold air leans the bike out.
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