08-15-2017, 07:41 AM
Dave, I'm pleased that your CB is idling normally these days and my fingers are crossed in the hopes that your fortunes continue.
I think there is merit in using top tier fuel with detergents and adding products like seafoam or injector cleaner periodically to keep the entire fuel system nice and clean. So the question I have is how does "gunk" accumulate in the IACV to keep the valve from operating reliably? Certainly johnf514 had an electronics issue in the IACV that was solved by replacing the part. Does a sticking IACV mean that deposits that accumulate over time prevent the valve from operating reliably? Initially I thought that the IACV only sees filtered air and that deposits shouldn't accumulate over time. After going through the service manual, I realized that our CBs have a crankcase emissions system (page 1-31 in the 2103 service manual). There is a crankcase breather hose running from the top of the engine to the front airbox. This system distributes blow by gas and presumably other nasty vapors from the crankcase back to the front airbox and then through the throttle body for combustion. Presumably the IACV is exposed to these crankcase emissions when the bike is idling.
If the blow by gas is composed of top tier fuel with detergents and fuel additives, is it possible that the IACV and throttle body is kept clean and functioning properly?
disclaimer: I'm not a mechanic so I'm just speculating with the thought of trying to help out.
I think there is merit in using top tier fuel with detergents and adding products like seafoam or injector cleaner periodically to keep the entire fuel system nice and clean. So the question I have is how does "gunk" accumulate in the IACV to keep the valve from operating reliably? Certainly johnf514 had an electronics issue in the IACV that was solved by replacing the part. Does a sticking IACV mean that deposits that accumulate over time prevent the valve from operating reliably? Initially I thought that the IACV only sees filtered air and that deposits shouldn't accumulate over time. After going through the service manual, I realized that our CBs have a crankcase emissions system (page 1-31 in the 2103 service manual). There is a crankcase breather hose running from the top of the engine to the front airbox. This system distributes blow by gas and presumably other nasty vapors from the crankcase back to the front airbox and then through the throttle body for combustion. Presumably the IACV is exposed to these crankcase emissions when the bike is idling.
If the blow by gas is composed of top tier fuel with detergents and fuel additives, is it possible that the IACV and throttle body is kept clean and functioning properly?
disclaimer: I'm not a mechanic so I'm just speculating with the thought of trying to help out.