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 Post Posted: Sat Mar 09, 2019 10:06 pm 
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Hornet Warrior
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Hi. I am always paranoid about getting a hydrolock if float needles or fuel valve fails. I know there are some carbs that have a security against this with introduced overflow drains. Is it the same on 2005 hornet? Should I.check my oil before every startup? Or can I sleep in peace?

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 Post Posted: Sun Mar 10, 2019 10:49 pm 
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Wait are you talking oil or fuel? The carbs will most definitely have an overflow, so does the engine. You can sleep in peace


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 Post Posted: Sun Mar 10, 2019 10:59 pm 
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Irongamer727 wrote:
Wait are you talking oil or fuel? The carbs will most definitely have an overflow, so does the engine. You can sleep in peace

Hi. I am talking about fuel getting into the oil through cylinder walls if floar needle fails. Checking oilmfor fuel smell and increased quantity is what I've meant. :)
Thanks!

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 Post Posted: Wed Mar 13, 2019 7:43 am 
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If it worries you, why don't you just turn of the possible fuel flow on the petcock? I had some issues with a leaking carb (which has been fixed since), but that just started the habit of turning the petcock to off when the bike is turned of/parked.


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 Post Posted: Wed Mar 13, 2019 9:07 am 
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Hornet Warrior

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Yeah I always turn the fuel to off


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 Post Posted: Wed Mar 13, 2019 2:31 pm 
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That's a good point. And I was always doing that on my previous '99 hornet. My now owned '05 Hornet doesn't have an adjusting handle. It is just vacuum operated. This is why I want to know if there is an overflow in case of disaster.

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 Post Posted: Wed Mar 13, 2019 9:45 pm 
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Really? How do they solve the issue of running out of gas? Do you have a gas meter? Can you see how much is left? I'd just not bother about the valve and ride it. Those valves hardly ever fail. If they would do, it's not the end of the bike either. Do regular oil changes and you'll be fine


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 Post Posted: Wed Mar 13, 2019 10:24 pm 
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Irongamer727 wrote:
Really? How do they solve the issue of running out of gas? Do you have a gas meter? Can you see how much is left? I'd just not bother about the valve and ride it. Those valves hardly ever fail. If they would do, it's not the end of the bike either. Do regular oil changes and you'll be fine

Yes. 2005-2006 Hornets have fuel level gauge. No problem on that point. Contaminated oil is the least of my worries here. Hydrolock is what i am paranoid of. :)

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 Post Posted: Thu Mar 14, 2019 6:54 pm 
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Xmixerx wrote:
Hydrolock is what i am paranoid of. :)


Why?

Surely there's a greater risk of crashing it or one of Kim Jon-un's stray rockets hitting it, than a Hydraulic lock writing it off!

Stop this paranoia now :Bad

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 Post Posted: Thu Mar 14, 2019 9:12 pm 
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Roger that one then! :angel

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 Post Posted: Thu Mar 14, 2019 9:45 pm 
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Xmixerx wrote:
Roger that one then! :angel


Don't and sleep peacefully - it's a Honda :)

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 Post Posted: Sun Mar 17, 2019 10:33 am 
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Victor Meldrew
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If a carb float valve did stick open, fuel would over flow through the overflow pipes attached to the float bowls. However, fuel could still find its way down the carb venture into the cylinder, via an open inlet valve, thence past the piston rings into the sump.

Many a CB175 and CB200 engine has been destroyed by running on oil thinned with petrol. The cam on those engines runs on plain bearings in the cylinder head, these melt at the first sign on compromised lubrication. Which is why standard advice to new owners of those bikes is to always turn off the petrol tap when parked, and to change the oil at 500 mile intervals. ( Only holds a couple of pints or so ).

Not from my engine, I hasten to add:

Image

That said, I haven't turned off my Hornets fuel tap in 20 years, apart from when it is laid up in the winter with the carbs drained. The needle valves on the Hornet carbs have nice Viton tips, which seal well, unlike the old school tapered brass needles onto brass seats in the CB175 carbs, which are well known for leaking once they've worn a bit.

EDIT And of course, you have the added backup of the Hornets vaccum operated fuel tap. That would have to fail, as well as the float valve in the carbs, unlikely for both to fail at the same time.

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 Post Posted: Sun Mar 17, 2019 6:18 pm 
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Hi Richard. Thanks for a detailed explanation. I understand that there are low chances that fuel tap and andy of the four float needles will fail at the same time. My only wish was to know if there is a backup plan. You say that there are overflow pipes. This sounds promising. However, I wasn’t able to spot any. The bowls only have a drain hole and that's it. Unless I’ve missed something in the upper part somewhere next to the jets...

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 Post Posted: Mon Mar 18, 2019 3:18 pm 
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Victor Meldrew
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I've been spending too much time with my 175s, which do indeed have overflow pipes on their float chambers, and a simple separate drain screw as well. :o

You are quite right, the four rubber tubes attached to the Hornet float bowls are DRAIN tubes, only come into play when the drain screws are loosened. I last did this back in November, how quickly one forgets. :(

So, if one of the float valves did stick open, and the engine kept running, pulling a vacuum on the fuel tap, where would the excess fuel go ? Good question, off to look at some parts diagrams …..

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 Post Posted: Tue Mar 19, 2019 6:05 pm 
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Richard,

If you ever figure out the outcome from all of this looking into diagrams, please share it with us here. :)

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 Post Posted: Tue Mar 19, 2019 6:10 pm 
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Victor Meldrew
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Nope, it's got me stumped.

Anyone got a spare set of carbs on the bench ? Overfill the float bowl, see where it comes out ??

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 Post Posted: Wed Mar 20, 2019 10:30 pm 
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Victor Meldrew
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Here's a photo of a CB175/200 float bowl. The overflow is quite simple, if the fuel level rises too high it overflows down the brass tube arrowed, and emerges from the stub on the bottom of the float bowl.

Image

And here's the Hornet float bowl. No internal overflow stand pipe as on the 175 carb. So the question remains, where does the fuel go to, if the needle valve sticks open ????

Image

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 Post Posted: Thu Mar 21, 2019 7:32 pm 
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Now that's some easy and reliable solution on a CB175. Hornet's carbs remain a mystery then. :)

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