CBR 600F3 1995 - 1998 CBR 600F3 Forum

Running Rich???

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Old Oct 23, 2009 | 11:46 AM
  #1  
murdocity's Avatar
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Default Running Rich???

Here's another noob question:

Yesterday I was warming up my bike before leaving work. The bike would keep stalling on me and after a couple of attempts it started up. As I was waiting this guy came up to me and told me that it was running rich. I'm new to bikes so I really don't know what that means. Any help? How can I fix this problem?
 
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Old Oct 23, 2009 | 04:38 PM
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I just finished my bike's running rich problem. Check operation of the choke lever and your pilot jet settings, it may even be something more simple. I rebuilt my carbs, re-jetted them and spent three weeks tweaking only to find that the Previous Owner has connected the coil wires backwards giving it a weak spark, put those in order and it started running lean! went back to original jets and its a beast now.

Another thing to take into consideration is that that guy might be used to fuel injected bikes. Carbs will always seem rich compared to fuel injection.
 
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Old Oct 23, 2009 | 04:48 PM
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He told me he had a harley so he knows and he smelled that it was running rich
 
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Old Oct 23, 2009 | 04:52 PM
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unless it smells like pure gasoline (mine did for a while) i wouldn't be extremely concerned. maybe try re-tuning the pilot jets. they are a pain to get to but i used a piece of brass pipe from the hardware store bent one side with needle nose pliers to make a "D" shape, much cheaper than buying the tool from honda.
 
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Old Oct 23, 2009 | 05:16 PM
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Rich: Too much gas in the fuel / air mixture in the engine
Lean: Too much air in the fuel / air mixture in the engine

Guys who've been working on engines a while can smell the condition of the F/A mix. The condition of your spark plugs will be the best indicator for a new mechanic. Google 'fouled spark plugs' and you'll usually find a pic showing how different engine conditions will make the plugs appear
 
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Old Oct 23, 2009 | 06:01 PM
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Well It doesn't smell like gas that much maybe for like 5 seconds it will smell like gas. I've noticed that in the mornings when I warm up my bike, It stalls maybe 1 or 2 times then It starts fine and it rides fine. But when I get off work I try to start it and it stalls more, it will take me like 5 times to get it start to warm up. What if I throw in some Seafoam, will that help? I'm gonna take a look at the spark plugs and see what's up.
 
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Old Oct 24, 2009 | 09:44 AM
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Sea foam never hurts, are you using the choke when you start it to warm up? if you are, try putting the choke at 1/4, 1/2, 1/3, and full open, the choke essentially just creates a lean mixture to help the bike start when cold. See if it starts more reliably in each position. that way. When I cleaned my plugs with a wire brush it didn't help at all, I ended up getting a local machine shop to sand blast them for $5. perfectly new. ha ha
 
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Old Oct 26, 2009 | 11:06 AM
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I have to play around with the choke, some times it will start with it 1/2 or somethimes full open. I'm gonna throw some sea foam in there and see what happens.
 
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