carbon build up on top of valve - Honda Motorcycles - FireBlades.org
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post #1 of 5 Old 02-10-2012, 7:21 AM Thread Starter
 
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carbon build up on top of valve

So I was going to check my valves and noticed when i took my air box off there was blow by spray on my far right velocity stack ( not the normal residual but enough to hit the top of the air box lid) as i looked down through the throttle body i could see carbon build up sitting on top of the valve... i initially thought bad valve boot or valve guide but I have no blue smoke, no start up issues, no performance issues or idle problems..bike runs fine. My valves are still in spec compression is good spark plugs look good.... just dont want to put her all back together if there is something i can do. Any suggestions?
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post #2 of 5 Old 02-10-2012, 2:35 PM
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Re: carbon build up on top of valve

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Originally Posted by Kapp1179 View Post
So I was going to check my valves and noticed when i took my air box off there was blow by spray on my far right velocity stack ( not the normal residual but enough to hit the top of the air box lid) as i looked down through the throttle body i could see carbon build up sitting on top of the valve... i initially thought bad valve boot or valve guide but I have no blue smoke, no start up issues, no performance issues or idle problems..bike runs fine. My valves are still in spec compression is good spark plugs look good.... just dont want to put her all back together if there is something i can do. Any suggestions?

Is it the intake nearest the where the crankcase breathes into the airbox?

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post #3 of 5 Old 02-10-2012, 3:00 PM Thread Starter
 
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Re: carbon build up on top of valve

Yes it is... Which I expect it to have by there rather than spreading across all the rest. I think it's spraying hard because of the carbon build up on the valve is not letting all the gas in rather it's soaking up some gas causing a combustion and shooting it into the air box.. My real concern is why there's carbon on top of valve?
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post #4 of 5 Old 02-10-2012, 10:50 PM
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Re: carbon build up on top of valve

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Originally Posted by Kapp1179 View Post
Yes it is... Which I expect it to have by there rather than spreading across all the rest. I think it's spraying hard because of the carbon build up on the valve is not letting all the gas in rather it's soaking up some gas causing a combustion and shooting it into the air box.. My real concern is why there's carbon on top of valve?

Because that cylinder is burning more of the oil-saturated air than the others. Sounds normal to me.

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post #5 of 5 Old 02-22-2012, 12:46 AM
 
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Re: carbon build up on top of valve

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Originally Posted by bladeracer View Post
Because that cylinder is burning more of the oil-saturated air than the others. Sounds normal to me.
jst normal wear and tear
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