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Old 11-20-2006, 12:03 PM   #1
jules929
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Bike runs lean

I own a '01 CBR929 and the only mods it has is a D&D bolt-on and K&N airfilter. The bike has little over 25000 miles and I recently replaced the spark plugs and cleaned and recharged the air filter. I changed the oil and oil filter a month ago also. Their is a lot of carbon build up in the exhaust and blows black carbon when I rev the bike to 4000-5000 rpms and let off the throttle. I'm considering taking the bike to be put on a Dyno to see what is the problem. The bike runs fine other than it runs lean. Let me know if anyone has had this problem.
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Old 11-20-2006, 12:32 PM   #2
zero_cool
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if its falling off around 10,000+ rpms, check your airbox and all your clamps around your throttlebodies. it might be getting some unmetered air in somewhere. i had the same problem on my gixxer. Powersports of Houston had a dyno at the Lonestar Rally so i figured i would throw my bike on it and see what my air/fuel looked like. it was running so lean it was off the charts. the folks at Powersports of Houston were real helpful. told me what was wrong with my bike and didn't even charge me for the dyno pulls. $.86 at wal-mart for some new screws and i almost doubled my housepower. i was being deprived all that time and didn't even know it. good luck with it
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Old 11-20-2006, 12:58 PM   #3
Patrick
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When you say it "it blows back carbon", do you mean it blows out some black smoke when you free rev it to 4-5k?
If so that is fairly normal, especially if you don't have a PC.
Most fuel injected bikes run a little rich in the midrange when they've been modified with a slip on and K&N.
Did you check if your airbox flapper is working properly?
How about your HTEV?
What plugs did you put in the bike?
Did you use the recommended NGK iridium plugs?
Other than it puffing a little black smoke, does it run o.k.?
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Old 11-20-2006, 02:52 PM   #4
jules929
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Quote:
Originally Posted by zero_cool
if its falling off around 10,000+ rpms, check your airbox and all your clamps around your throttlebodies. it might be getting some unmetered air in somewhere. i had the same problem on my gixxer. Powersports of Houston had a dyno at the Lonestar Rally so i figured i would throw my bike on it and see what my air/fuel looked like. it was running so lean it was off the charts. the folks at Powersports of Houston were real helpful. told me what was wrong with my bike and didn't even charge me for the dyno pulls. $.86 at wal-mart for some new screws and i almost doubled my housepower. i was being deprived all that time and didn't even know it. good luck with it
Everthing looks okay to my knowledge. I made sure everything was connected and bolted/screwed down. I went to the rally but didn't think about putting my bike on the dyno.

Quote:
Originally Posted by Patrick
When you say it "it blows back carbon", do you mean it blows out some black smoke when you free rev it to 4-5k?
If so that is fairly normal, especially if you don't have a PC.
Most fuel injected bikes run a little rich in the midrange when they've been modified with a slip on and K&N.
Did you check if your airbox flapper is working properly?
How about your HTEV?
What plugs did you put in the bike?
Did you use the recommended NGK iridium plugs?
Other than it puffing a little black smoke, does it run o.k.?

Yes, I replaced the spark plugs with NGK Iridium plugs. I'm not sure if the flapper or the HTEV are working properly since I didn't check them. The bike feels and runs fine but it's the black soot that bothers me. I didn't say smoke because it doesn't look like smoke to me. It looks more like black dust coming out of the exhaust. I said lean earlier but I meant to say rich.
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Old 11-20-2006, 04:00 PM   #5
Patrick
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Nothing to worry about then, it's pretty normal on fuel injected bikes.

If you're still worried about it and also want to verify that the HTEV and flapper are working, take a ride by and I'll lok at it real quick, no charge.
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Houston, TX 77090
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Old 11-20-2006, 05:22 PM   #6
jules929
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I was thinking about taking it to your shop. Thanks for the offer Patrick. I might have to take that offer.
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