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CB750 Barn find project - First Timer
Underdog1:
--- Quote from: Honda Al on September 01, 2018, 07:13:35 PM ---
--- Quote from: Underdog1 on September 01, 2018, 05:03:32 PM ---So thankfully it seems it’s the washer on the oil tank drain bolt leaking rather than the oil hose, I’ll replace the washer at some point and see if it makes a difference.
The seats currently with a local upholsterer getting sorted, have received a Morgan carbtune pro so I’ll hopefully have the carbs dialled in soon (unable to work on it this weekend though).
The carbs are still dumping fuel seemingly randomly. I’ll put the bike away and switch the fuel off, tinker around with a few things and still no fuel dumped.. but when I come back into the garage the next day there will be fuel ok the floor. Sometimes it doesn’t happen for a few days and all of a sudden it justs dumps the fuel whilst sat doing nothing...
They floats seem ok, if they were at incorrect heights or whatever surely it would just overflow straight away?
--- End quote ---
I’ve had this recently on my 500. At first I thought I left the fuel tap on, but realised that the fibre washers in the petcock housing had failed and were leaking fuel through the tap down into the carbs. They would then overflow onto the garage floor.
Quick test is to lift the fuel tank, and place it on a flat surface with a tray under the petcock. If the petcock is switched off but fuel starts gathering in the tray, there’s the source of the problem.
Hope this helps.
Sent from my iPhone using Tapatalk
--- End quote ---
Thanks for the advice but as this has happened with a remote fuel tank too I don’t think it’s petcock related
Rob62:
I had the leaking oil line problem..... apparently the oil lines rarely fail so i messed about with various washers but to no avail. I ended up having the oil line re-hosed at mendahose (not for the purist but very cheap and looks great imo).... solved the problem and a week later the 2nd hose also started dripping so i had that re-hosed exactly the same. Now both ok and look great, cost £35 each. You can get original looking pipes from dss for £300 ! Or they can be re-tubed back to standard but I think you would be happy with pipes done at mendahose or some other similar industrial hydraulic repair shop...http://www.mendahose.co.uk
Underdog1:
--- Quote from: Underdog1 on September 01, 2018, 10:20:31 PM ---
--- Quote from: Honda Al on September 01, 2018, 07:13:35 PM ---
--- Quote from: Underdog1 on September 01, 2018, 05:03:32 PM ---So thankfully it seems it’s the washer on the oil tank drain bolt leaking rather than the oil hose, I’ll replace the washer at some point and see if it makes a difference.
The seats currently with a local upholsterer getting sorted, have received a Morgan carbtune pro so I’ll hopefully have the carbs dialled in soon (unable to work on it this weekend though).
The carbs are still dumping fuel seemingly randomly. I’ll put the bike away and switch the fuel off, tinker around with a few things and still no fuel dumped.. but when I come back into the garage the next day there will be fuel ok the floor. Sometimes it doesn’t happen for a few days and all of a sudden it justs dumps the fuel whilst sat doing nothing...
They floats seem ok, if they were at incorrect heights or whatever surely it would just overflow straight away?
--- End quote ---
I’ve had this recently on my 500. At first I thought I left the fuel tap on, but realised that the fibre washers in the petcock housing had failed and were leaking fuel through the tap down into the carbs. They would then overflow onto the garage floor.
Quick test is to lift the fuel tank, and place it on a flat surface with a tray under the petcock. If the petcock is switched off but fuel starts gathering in the tray, there’s the source of the problem.
Hope this helps.
Sent from my iPhone using Tapatalk
--- End quote ---
Thanks for the advice but as this has happened with a remote fuel tank too I don’t think it’s petcock related
--- End quote ---
Well the bike has been standing a week and it still looks like fresh fuel is coming out the overflows despite petcock being switched off also one or two of the overflow tubes themselves are falling apart at the ends.. is this ethanol related?
K2-K6:
Take the float bowl off and secure it level, fill with fuel and see if it drops then.
You can get the internal brass "standpipe" tube cracked and it let's the fuel leak out even without breaching the float/fuel level.
Check each in turn to find any errors.
Underdog1:
--- Quote from: K2-K6 on September 02, 2018, 05:29:39 PM ---Take the float bowl off and secure it level, fill with fuel and see if it drops then.
You can get the internal brass "standpipe" tube cracked and it let's the fuel leak out even without breaching the float/fuel level.
Check each in turn to find any errors.
--- End quote ---
Just to clarify you mean fill up the carb bowl when they are off the bike?
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