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Goodwin
Familiar Member
United Kingdom
282 Posts |
 Posted - 30/08/2007 : 09:33:18
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Hello, as reported on another thread my bikes got covered by water in the recent floods, the VFR has been taken back to the bones and put back again, its turning over and getting a spark, I can get the bike to start by dropping some petrol into the carbs but wont start from the tank.
Ive read that the vacum could be the problem, the pipe from the tank to the bottom right carb was missing, I asked my brother who previously owned the bike and he said it never had a pipe on it! making me think that the conversion has already been done.
The tap itself has the three pipes, one for the petrol (thick pipe) and two pointing down, not one in the same direction as the fuel pipe as in this image 
The petrol flows out of the tank easy when the tap is turned on, but think its not getting through.
Any suggestions? do you think the tap conversion has been done? |
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nakes
Regular Member
South Africa
563 Posts |
Posted - 30/08/2007 : 10:09:58
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If the fuel flows out the tap freely when the tap is open then I think the fuel tap mod had been done...
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http://www.hondarvf.com - A community driven workshop guide... |
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Cam
Regular Member
United Kingdom
852 Posts |
Posted - 30/08/2007 : 13:40:52
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Why not just open it up and look?  Tis only four screws... |
http://www.localbikers.org.uk: Creating communites for the bikers of the UK. |
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Tanuki
Bike washed twice a year
United Kingdom
8194 Posts |
Posted - 30/08/2007 : 13:50:21
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quote:
Originally posted by nakes
If the fuel flows out the tap freely when the tap is open then I think the fuel tap mod had been done...
and you would be right. |
Ha ha ha, oh my God! I almost didn't do it, I almost didn't do it! I thought, is this in bad taste? But you know what, I went for it. I went for it and I'm so glad I did! Ooooh, worth it, totally worth it.
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Goodwin
Familiar Member
United Kingdom
282 Posts |
Posted - 30/08/2007 : 18:53:12
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| Just wanted confirmation, will have to take a look to see why its not getting through, any suggestions based on it being recently covered in water? |
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nakes
Regular Member
South Africa
563 Posts |
Posted - 30/08/2007 : 20:26:12
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quote:
Originally posted by Goodwin
Just wanted confirmation, will have to take a look to see why its not getting through, any suggestions based on it being recently covered in water?
A small fish stuck in the fuel lines.... lol
Have you opened the carbs up? Maybe the floats are stuck or something?... basically check that everything between the fuel tap and carbs is clear and that the carbs are perfect... nothing stuck or clogged with gunk... |
http://www.hondarvf.com - A community driven workshop guide... |
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katana
Settled In Member
United Kingdom
101 Posts |
Posted - 31/08/2007 : 14:50:30
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| Why would you do the mod? |
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Tanuki
Bike washed twice a year
United Kingdom
8194 Posts |
Posted - 03/09/2007 : 10:45:10
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the mod was for the HRC race bikes because when running at WOT for long periods the bikes wouls suffer from fuel starvation...this wont happen on the road so is a pointless mod IMO.
a few people on here have has big problems with the cylinders filling with fuel when the bike has been stood for a while... |
Ha ha ha, oh my God! I almost didn't do it, I almost didn't do it! I thought, is this in bad taste? But you know what, I went for it. I went for it and I'm so glad I did! Ooooh, worth it, totally worth it.
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alivee4
Senior Member
Australia
1097 Posts |
Posted - 04/09/2007 : 04:31:22
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| If you're running big jets (open carb set-up) it's absolutely necessary. The vaccuum just can't keep up the fuel supply. But as Monkey says, a few have had major probs with it, so only use it if you have to and preferably with a dry break for insurance. It's very easy (and potentially expensive) to forget to turn the tap to 'off'. |
NC30 track bike on a carbon fibre diet |
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shipleymanx
Settled In Member
United Kingdom
57 Posts |
Posted - 07/09/2007 : 12:39:11
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| As i am new to 400, what do you do to the tap. I presume that without this mod the fuel was drawn through by vacuum, is this correct |
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vfrman
Moderator
USA
8005 Posts |
Posted - 07/09/2007 : 16:31:45
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| There is a little diaphram inside the pet*Censored* that is closed when the engine isn't running. When you start the motor, a vacuum is created on one side of the diaphram, pulling it away from its seat and allowing fuel to flow. |
91 VFR400R
Hill AFB, Utah
USA |
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kenny629
Settled In Member
United Kingdom
182 Posts |
Posted - 07/09/2007 : 20:31:38
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going to do mine at the weekend, wouldnt start earlier today as the fuel tap was playing up, far better without having to rely on the vacuum, just have to remember to turn the fuel tap off when leaving the bike sitting for a while
kenny |
bravery is being the only one who knows your afraid |
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JonRA23
Familiar Member
Australia
382 Posts |
Posted - 07/09/2007 : 21:12:44
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Hi Goodwin
If the carbies went underwater you will have to strip them down and clean any water out of them to get it to run.
You dont have to pull them appart completely just the vacuum tops and slides out, float bowls off, jets and needles and seats out. Then give them a blow out with compressed air and re-assemble.
The float bowls have o orings on them so you won't need any gaskets or the like, pay to check the float level while you have them appart.
regards
jon |
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Topic |
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Fuel vacum, has it been done already?
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