CBR BOGGING DOWN WONT GET PASSED 45mph - Page 4 - CBR Forum - Enthusiast forums for Honda CBR Owners


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  #31  
Old 03-09-2017, 09:31 AM
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Okay, I'm going to check is the vacuum hose connect to the FPR has fuel in it. That's the sign that is gone bad correct?? I want to say my exhaust does have a strong gas smell to it, which is another indicator right? But that could just be me looking for answers to my problem. I'd have to start it up tonight to be sure.
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  #32  
Old 03-09-2017, 10:47 AM
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That's how you test if the diaphragm is ruptured. If it's sticking open, you can clamp off the return hose and bump up the pressure and see if the problem continues. I don't recommend running on it with the pressure up that high.

Kind of a long shot, but worth a check.
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  #33  
Old 03-09-2017, 11:01 AM
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I'm not using the bike for commute anymore. So everything I need to work on and try I won't be able to do until night time. I hope to fix it before riding it everyday again. What do you mean bump up the pressure?

Saying it's a long shot, you don't think the FPR is the problem?
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  #34  
Old 03-09-2017, 11:47 AM
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When you clamp the return line, you're not allowing the excess pressure to bleed off into the tank. The system will be at full pump pressure, which it double what it should be.

Long shot meaning its not a very common thing. Usually the FPR leak and fail... But at this point, you don't want to overlook anything.
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  #35  
Old 03-09-2017, 01:13 PM
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So after I clamp it I should go drive it around to see if that changed anything? Or just start it?
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  #36  
Old 03-09-2017, 01:55 PM
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I wouldn't ride very far like that.

Same as before, when it does it, reach under and clamp the return hose. It will get better all of a sudden or it won't.

Intermittent problems are a bitch....
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  #37  
Old 03-09-2017, 02:45 PM
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Just curious, if I do take the vacuum hose off and it drops or has fuel in it could that also be the problem. I just was looking through other forums and someone (lots of people) stated similar bike issues. Not 100% the same but then again no one is posting on exactly the same issues. I'm just trying to get the bike back healthy. But at the same time a lot of symptoms were the same for fuel pump problems too. So like you said... this is a bitch.
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  #38  
Old 03-10-2017, 06:22 PM
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Yes, a bad FPR will cause problems. Pull a sparkplug, it'll tell you if the fuel mixture is bad enough to cause running issues by its color/condition.
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  #39  
Old 03-11-2017, 08:51 AM
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I was about comment again before I read your post. I just changed spark plugs recently. But when I took the old ones out the "pin" was still in great condition at a sharp point. But the end of each plug was brown/black. Which upon doing more research, is another symptom of bad FPR. Once again this could just be wishful thinking because I'm so ready to just know what the problem is! Any thought on this update? I am planning to do some work tonight on the bike. So let me know anything I may need to look into while I'm in there. I am going to try to do the hose clamp after I take the fairings off.
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  #40  
Old 03-19-2017, 08:21 PM
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Update: I think I found the problem. Little did I know that there were suppose to be four hose connected to the air box. Well I only recalled disconnecting three when doing previous work. So I opened her up real quick and discovered that the previous owner had broke off the plastic connector piece for vacuum hose #4. So this entire time that hose has been disconnected and not holding the vacuum. I ordered a new air housing so that is on its way. I think this is the solution to my problem! But I will let everyone know after I install the new part and get on the road again.
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