|
|
Post by Aussie RE Man on Jun 20, 2010 2:44:00 GMT -5
 OK I went out for the first spin on my M model since restoring it to see my old next door neighbor who’s a bike nut too. He admired my work and had a listen to it running and all was good until he’s wife asked me in for coffee. After about half an hour we went back round the front of the house to find the oil tank overflowing with a petrol oil mix?? The only thing I can think of is as it was sat in the sun pressure built up in the petrol tank and pushed the fuel back down the oil feed line and metering pump back to the oil tank?? It is winter here but we still get mid 20’s and I was out in just a T shirt as he’s only a few streets away and there was a lot of pressure in the tank when I took the filler cap off. Anyone come across this or any ideas?? I do find all my RE’s seem to drip the odd drop of fuel even with new petrol tap inners are new  .
|
|
|
|
Post by Aussie RE Man on Jun 20, 2010 3:31:23 GMT -5
 Attachments:
|
|
|
|
Post by steveuk on Jun 20, 2010 4:51:46 GMT -5
Hi Simon, i would thing that the check valve is faulty, it should only let oil through and nothing back the other way
just a thought
steve
|
|
|
|
Post by Aussie RE Man on Jun 20, 2010 7:16:51 GMT -5
Yep I agree with that too but do you think it's possible that the pressure build up in the tank would be enough to push the diaphragm back in the petrol tap and flood the carby?? plus i would have thought it would leak/fill the inlet tube easier than pushing back down the oil feed line from the float bowl?? I was very surprised at the pressure build up in the tank too, It's a brand new cap. They don't seem to have any breather/ pressure relief in them ?? Have you or anybody had any probs with dripping carby's from what must be a leaky petrol tap?? |
|
|
|
Post by steveuk on Jun 20, 2010 8:16:15 GMT -5
i would think the only way to get petrol in the oil tank is through a faulty check valve, the fuel tank cap should have a vent in it else you would pressurize the tank , i would also check the vapor pipe from the r/h side of the tap to the bottom of the tank and the unions where the pipe connects to the tap and tank for blockages as that could build pressure in the fuel line and the carb.
just a thought but they are worth checking
Steve
|
|
|
|
Post by ziggystardust on Jun 20, 2010 12:49:42 GMT -5
Got to agree with Steve, the check valve sounds to be the culprit.
I once removed mine while the engine was ticking over and was surprised just how much petrol came out before I had time to switch it off.
Z
|
|
|
|
Post by Aussie RE Man on Jun 20, 2010 15:44:12 GMT -5
Thanks for the info guys Good job I've already ordered two of Jess's new revised valves and should be here soon. Cheers |
|
OK I went out for the first spin on my M model since restoring it to see my old next door neighbor who’s a bike nut too. He admired my work and had a listen to it running and all was good until he’s wife asked me in for coffee. After about half an hour we went back round the front of the house to find the oil tank overflowing with a petrol oil mix?? The only thing I can think of is as it was sat in the sun pressure built up in the petrol tank and pushed the fuel back down the oil feed line and metering pump back to the oil tank?? It is winter here but we still get mid 20’s and I was out in just a T shirt as he’s only a few streets away and there was a lot of pressure in the tank when I took the filler cap off. Anyone come across this or any ideas?? I do find all my RE’s seem to drip the odd drop of fuel even with new petrol tap inners are new 
