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Old 03-09-2010, 09:50 PM   #1
cghill
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Default 01 CBR F4i throttle jumpy on first spring ride

New member here, so hi all. I had some decent weather today, so I decided to take my bike out for a ride. However, I noticed while riding that the throttle was extremely jumpy while I was riding. By jumpy I mean that I would hold the throttle steady, but I the bike would keep cutting RPMs on me randomly ever second or so (not evenly spaced timing). Basically, it felt the same as if I would rev the engine and then quickly dump the throttle and pull it back up. Especially if I was in the 3-5k RPM range - the jumpiness seemed to go away when I got higher RPMs and it seemed to idle just fine as well. Does anyone have any idea what this might be. I don't know if I'm describing the issue very well.

A little background - this is my first bike, and it was my first winter with the bike. I didn't realize that I needed to "winterize" it (which may be causing the problem). When I parked the bike in November of last year, there wasn't much fuel left in the tank - just above the reserve. I took the bike out in January and filled the tank full - but I never added any Stabil to it (I didn't know I needed to at the time. Live and learn...I'll do it next year). ALSO I didn't disconnect the battery, so the battery was dead when I took the bike out in January. However, I purchased a charger, and charged the battery to full today before I took it back out.

I think its important to mention that I when I took the bike out in January, I rode it for about 10-15 minutes, and then went to fill up with gas. Apparently that wasn't enough to charge the battery for another start, so I jumped it again and then drove it home (~1 mile away). That short drive home was the FIRST time that I felt the jumpiness (not during the 10-15 minute ride), but my friend who escorted me on the ride (due to the dead battery) and jumped me at the gas station figured it was because the battery had no power and everything was running purely off of the alternator, thus the power was fluctuating and causing the jumpiness. I think thats an unlikely diagnosis now since the battery was charged to full before I took it out today.

Anyway, sorry for the wall of text here, but I want to give as much info as possible about the problem. Does anyone have any idea what could be wrong?
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Old 03-10-2010, 06:18 AM   #2
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Finally someone who actually tells you some history on the bike? Wheew thats a relief-No, thank you for the wall of text. Really.

Remember when you leave a bike to sit, the fuel goes bad quicker when there is less gas in the tank. Having more air in the tank is what causes the fuel to tarnish faster. Your usually good for 4months if you fill it full. Even without fuel stabilizer.

Secondly always charge the battery while the bike is sitting. Get your self a trickle charger, they are very cheap and have the ability to turn itself on and off under its own power. And lastly never ever jump a bike with a car, unless the car is not running no exceptions or you'll blow components in your charging system.

My diagnoses,... Carb clean, new battery, check charging system. Good luck!!! Lets us know...
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Old 03-10-2010, 06:30 AM   #3
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I'll bet there is water in the tank from when it was nearly empty and sitting. Get some "Dri-Gas" or "Seafoam" gas conditioner and add it per the directions. And what Moke said.
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Old 03-10-2010, 07:09 AM   #4
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I second on both responses.

(Is this where I put the link to some non-moto-related spam like Women's boots for Men?)
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Old 03-10-2010, 10:03 AM   #5
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I second on both responses.

(Is this where I put the link to some non-moto-related spam like Women's boots for Men?)
How's that working out for ya? Studly....
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Old 03-10-2010, 12:02 PM   #6
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How's that working out for ya? Studly....
You wouldn't believe me if I told you.
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Old 03-10-2010, 02:22 PM   #7
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You wouldn't believe me if I told you.
"Please stand back, I dont know how big this thing is going to get."
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Old 03-10-2010, 03:57 PM   #8
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Quote:
Originally Posted by MOKE1K View Post
My diagnoses,... Carb clean, new battery, check charging system. Good luck!!! Lets us know...
The F4i is fuel injected, so is there something I should do instead of cleaning the carb? Also, how can I check the charging system?
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Old 03-10-2010, 04:04 PM   #9
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You really of need a manual for the bike. We might be able to make some guesses but to really check out your electrical and FI systems a manual is a must.
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Old 03-10-2010, 06:32 PM   #10
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The F4i is fuel injected, so is there something I should do instead of cleaning the carb? Also, how can I check the charging system?
As far as the fuel system goes, run out the gas that's in there with a water treatment and get clean fuel. I'll bet that's the end of it.

To test your charging system, get a multi-meter at any tool department/store/parts store etc. $20 will cover one. Set it for DC volts and put the leads on the battery +/-. Should see around 11-12 volts. Start the bike, while it's running, put the leads on again. Should see more than what you saw before. It helps if you can run the revs up a bit. 13 volts is a good charge.
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