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Old 08-26-2014, 06:11 PM   #1
xsv
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Bike revving without throttle input

My 2012 CBR 250r usually idles at ~1500 RPMs. Last night went I rode to the gym, the bike would rev at 2000 RPMS and then slowly go down to idle at 1500 RPMS without any throttle, clutch in, and I made sure the throttle wasn't stuck. This has happened before when I started the bike one morning and the bike revved up to 2000 RPMS. I turned the bike off and turned it back on and now it doesn't rev by itself anymore. Anyone know what the problem is?
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Old 08-26-2014, 06:47 PM   #2
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Lean conditions? No clue.
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Old 08-26-2014, 07:13 PM   #3
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The CBR250 is FI right?
Check for air leaks around the TB and engine inlet or an unplugged hose on the airbox. Did u recently do any maintenance?
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Old 08-26-2014, 08:01 PM   #4
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Quote:
Originally Posted by BYRDMAN View Post
The CBR250 is FI right?
Check for air leaks around the TB and engine inlet or an unplugged hose on the airbox. Did u recently do any maintenance?
no, haven't done anything to the bike recently. and yes it's fuel injected
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Old 08-26-2014, 08:12 PM   #5
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Like coung said ita probably a lean condition (air leak) somewhere around the intake possibly or airbox. Being a thumper i bet something rattled loose from vibrations. Pop the fuel tank up and check for something out of ordinary.
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Old 08-27-2014, 06:33 AM   #6
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Sounds like an auto choke system to me, especially considering you mentioned that it has happened at startup previously. I'd assume, as cooler weather approaches in the coming months, that you'll notice the higher idle at startup more often than you do in the summer months. Need more info as to exactly when this is occuring; when the bike is warming up or once you've reached normal operating temperature? I'd be hesitant to look for air leaks on a 2012 model CBR250. . .call me naive but I wouldn't expect that sort of problem from a newish Honda.
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Old 08-27-2014, 12:30 PM   #7
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Quote:
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Sounds like an auto choke system to me, especially considering you mentioned that it has happened at startup previously. I'd assume, as cooler weather approaches in the coming months, that you'll notice the higher idle at startup more often than you do in the summer months. Need more info as to exactly when this is occuring; when the bike is warming up or once you've reached normal operating temperature? I'd be hesitant to look for air leaks on a 2012 model CBR250. . .call me naive but I wouldn't expect that sort of problem from a newish Honda.
Bingo. Reason it probably didn't do it after you turned it off and turned it back on is because it was already warmed up.
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Old 08-27-2014, 12:43 PM   #8
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It was happening after the bike was warmed up while I was riding it. It happened one morning before when I started it up and left it idling last spring. Two different occasions
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Old 08-27-2014, 12:50 PM   #9
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Call me crazy but I couldn't get worried about 500 RPMs. Your bike is almost brand new. Sounds like the FI is compensating for conditions to me.
If it gradually gets worse, at that point I would start to worry about it.
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Old 08-27-2014, 12:51 PM   #10
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Quote:
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It was happening after the bike was warmed up while I was riding it. It happened one morning before when I started it up and left it idling last spring. Two different occasions
I'm no motorcycle mechanic, so take this however you wish. If it happens on startup and goes away when normal operating temperature is reached, I'd say it's a normal function of the autochoke on that FI bike. If it happens randomly, I'd say let a qualified mechanic look at the bike.
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Old 08-27-2014, 01:11 PM   #11
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in take leak, is the bike carb? it can happen to FI bikes also, how old what mileage and how is your bike stored? you need to take some starting fluid and spray it around your intake manifold and see if the idle raises if so, you've got an intake leak.

Also if you need to see how this is done, search intake leak on youtube you can see people doing it to cars and bikes.
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Old 08-27-2014, 09:13 PM   #12
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Put a little slack into the throttle cable. It could be binding.
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Old 08-27-2014, 11:14 PM   #13
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Old 08-28-2014, 09:09 AM   #14
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seems normal to me
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Old 08-28-2014, 09:22 AM   #15
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Just ride it out
Only a 250 anyway
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Old 08-28-2014, 11:24 AM   #16
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possibility that the throttle bodies need to be synchronized??
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Old 08-28-2014, 11:26 AM   #17
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Just sell it. I got 50 bucks OP
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Old 08-28-2014, 11:41 AM   #18
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just realized that this was a newer-ish 250, if the bike is in fact fuel injected you'd want to make 200% sure that your throttle cables are correctly routed, aligned, and not taut or bound. pop out your owners manaul and the info for the correct spec should be in there.

After making 200% sure this is fine then start looking for intake leaks or other such, but only after
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Old 08-28-2014, 02:02 PM   #19
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I don't see why a 2 year old bike would be having most of these issues.

I'd guess the computer is trying to do something, and wouldn't worry about it unless it happened for a few tanks of gas

changing the plugs and air filter couln't hurt...
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Old 08-28-2014, 02:37 PM   #20
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Quote:
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possibility that the throttle bodies need to be synchronized??
This post gave me an odd feeling. What is the sound of one hand clapping?
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