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Post by Harold on Dec 19, 2017 9:40:22 GMT
Looks like you found the seat of the fire Nick, how it would have started I don't know. It looks like it's started inside the airbox ?
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Post by Deleted on Dec 19, 2017 11:59:04 GMT
Very odd , is there a backfire screen on the CBR ? Although you'd not expect it to backfire running on tickover , a friend had his CCM burn out when it backfired and set the airbox alight .
So many possible culprits its like an Agatha Christie !
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Post by Deleted on Dec 19, 2017 13:17:38 GMT
Very odd , is there a backfire screen on the CBR ? Although you'd not expect it to backfire running on tickover , a friend had his CCM burn out when it backfired and set the airbox alight . So many possible culprits its like an Agatha Christie ! It is. I may have had a stroke of luck to help us understand. I'm gathering parts from ebay and a replacement airbox has just arrived with an interesting decal (diagram) on it. Firstly though, this is the type of fuel pump fitted to these models. What I want to know is why the fire seemed to occur in two places - at the breather end and at the airbox.  |
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Post by Deleted on Dec 19, 2017 13:21:21 GMT
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Post by Deleted on Dec 19, 2017 15:10:23 GMT
As the decal suggests its for a California spec bike I'd think its a carbon canister for emmisions ? Often seen on cars for to reduce hydrocarbom emmisions from fuel tanks , breathers etc .
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Post by Deleted on Dec 19, 2017 15:27:37 GMT
Ah okay. I think I was about to bark up the wrong tree on that then, Boje.
Is it probable that the ignition was the contacts in the fuel pump (as the recall suggests) and that the fire could of come out of the breather and also the air box maybe via a vacuum type thing?
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Post by Deleted on Dec 19, 2017 16:15:22 GMT
Is it probable that the ignition was the contacts in the fuel pump (as the recall suggests) and that the fire could of come out of the breather and also the air box maybe via a vacuum type thing? Seems likely the pump points were the ignition source you'd think , does that breather go to the airbox over that side ? As you say fire in the breather then becomes a "blowlamp" as its sucked into the airbox ? Mysterious for sure , hopefully the repositioned breather has stopped the issue . |
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Post by Deleted on Dec 19, 2017 18:42:09 GMT
Is it probable that the ignition was the contacts in the fuel pump (as the recall suggests) and that the fire could of come out of the breather and also the air box maybe via a vacuum type thing? Seems likely the pump points were the ignition source you'd think , does that breather go to the airbox over that side ? As you say fire in the breather then becomes a "blowlamp" as its sucked into the airbox ? Mysterious for sure , hopefully the repositioned breather has stopped the issue . Breather pipe comes out of the pump and is routed (should be routed) to the ground. Only the fuel in and fuel out pipes left on the pump. Would ignited vapor be able to enter the carbs via the fuel pipe and escape via the air box? I don't see any other explanation. Bike was on full choke when the incident occurred - within 10-15 secs of running from stone cold. |
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Post by Deleted on Dec 19, 2017 18:51:29 GMT
Just reading it again. Trying my hardest to understand what it's saying.  |
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Post by Deleted on Dec 19, 2017 22:21:05 GMT
I read it that the fuel pump has breather pipe (presumably tending to produce a low pressure area) and that the carb breather pipe is nearby . If the carb breather releases enough fumes it could be sucked up into the "open" part of the fuel pump containing the (sparking) points ? IE perhaps ironically the fuel that catches fire is not directly linked to the pump - that is just the ignition source .
But why it's concentrated in that corner of the airbox ?...............
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carlthebandit
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Post by carlthebandit on Dec 20, 2017 7:45:41 GMT
I presume your not putting this through your insurance Nick?
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Post by Deleted on Dec 20, 2017 12:15:40 GMT
I presume your not putting this through your insurance Nick? Texted you. |
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Post by Deleted on Dec 20, 2017 12:17:46 GMT
I read it that the fuel pump has breather pipe (presumably tending to produce a low pressure area) and that the carb breather pipe is nearby . If the carb breather releases enough fumes it could be sucked up into the "open" part of the fuel pump containing the (sparking) points ? IE perhaps ironically the fuel that catches fire is not directly linked to the pump - that is just the ignition source . But why it's concentrated in that corner of the airbox ?............... I wonder if this provides a clue. I am assuming that's the carb breather nipple/outlet - located on the far right carb. What do you reckon?  |
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Post by Deleted on Dec 20, 2017 19:29:15 GMT
Looks possible FB , that would line up with my "blowlamp" theory into the airbox , so maybe there was fire in both pipes - the pump breather and carb breather ?... Although this is based on a complete ignorance of the workings/plumbing of a Jellymould  |
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Post by Deleted on Dec 20, 2017 19:34:20 GMT
Looks possible FB , that would line up with my "blowlamp" theory into the airbox , so maybe there was fire in both pipes - the pump breather and carb breather ?... Although this is based on a complete ignorance of the workings/plumbing of a Jellymould Literally just got back with the bike an hour or so ago and been out there to shine the torch around. Look what I've found now, Boje. That little pipe is scorched to hell. Will upload a diagram which may help us understand the 'plumbing' but what I'm thinking now is that the pump ignited the fuel and sent it up to the carbs out of that pipe and also out of the breather to the fairing.   |
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