CBR 1000F "Hurricane" 1987-1996 CBR 1000F

Runs faster when cooler, why ?

Old 03-21-2017, 07:57 PM
Thread Starter
Join Date: Jun 2016
Posts: 90
Default Runs faster when cooler, why ?

My 1990 cbr 1000f

I put stage 2 jet kit in laster year. I noticed a huge difference from the stock jets.

4 into pipe.

not since I bought it last summer, and didn't ride in cool weather, because I repainted the bike.
which I need to update Myour bike, pic post here.

forgot photobucket, passy, to add photos. Lol.

any how.

today I road bike. 45 degrees, and bike was duper fast, compared to the 80, 90 degree weather I typically ride in.

why ? And what can I do to the carbs, or jets to see this bike run like it does in the cooler weather now, but in hotter summer weather ?
Old 03-21-2017, 08:35 PM
74demon's Avatar
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Cool air is more dense, which means more air molecules can get in to the combustion chamber. As they heat up with combustion, they expand with more force.
Old 03-23-2017, 05:05 AM
bullroarer's Avatar
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Join Date: Jul 2015
Location: Heathfield, East Sussex.
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The intercooler effect, fitted to some trucks and cars cools the air befor it enters the combustion chamber.
Old 03-24-2017, 12:33 AM
Join Date: Dec 2016
Location: Malta
Posts: 98

U have massive jets in there now so plenty of fuel.. when it runs hotter it needs less fuel to produce the same power, so now your basically flooding it when its warmed up. I had the same issue but to the point it didnt run well at all . maybe drop back a size or 2 on the jets.
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