Misfire after parking on an incline
btc-er - August 31st, 2011 at 04:17 PM
I've noticed that if I park on the side of a hill or across an incline so that one side of the motor is lower than the other side I get a misfire on
the side that was lower for a few minutes after starting. 
Is this common? Any suggestions regarding the possible cause?
1303Steve - August 31st, 2011 at 05:40 PM
hi
Your needle and seat in the carb could be leaking and filling the cylinder up with fuel.
Steve
Anthiron - August 31st, 2011 at 05:49 PM
+1 /
Happend to me. Check to see if your dipstick smells like fuel too. If you park on a hill and it leaks past the rings it will end up in your sump.
phatratpat - August 31st, 2011 at 07:03 PM
check oil NOW !!...once had a kombi engine detonate on me because of this...not pretty !!
you can get a fuel cut off switch put in the fuel line that will stop the problem............
bajachris88 - August 31st, 2011 at 08:30 PM
This is an awesome cut off switch i bought from poland.
One of the cheapest, and its pretty darn good quality. 12v from your coil (if mounted in rear) or 12v from brake light switch wiring for front tank
mount and it will open. and of course, close when current stops.
Theres an emergency override too 
btc-er - September 1st, 2011 at 12:03 PM
Guy's, you're scaring me! This sounds far more serious than I had imagined. Damn that stupid empi progressive!
| Quote: |
Originally
posted by bajachris88
This is an awesome cut off switch i bought from poland.
One of the cheapest, and its pretty darn good quality. 12v from your coil (if mounted in rear) or 12v from brake light switch wiring for front tank
mount and it will open. and of course, close when current stops.
Theres an emergency override too
|
Did you have a link for the cut off you bought?
Lucky Phil - September 2nd, 2011 at 08:43 PM
Could also be oil leaking into the cylinders. BMW motorcycles were notorious for it when left on sidestand after a good run.
btc-er - September 3rd, 2011 at 08:41 PM
Have I got this right... the purpose of the cut off switch is to prevent fuel gravity feeding from the fuel tank into the carby and then into the
motor? Does that mean that if I park so that the front is lower than the back I shouldn't see the problem?
If the needle valve was leaking would that mean that I would also be running rich?
| Quote: |
Originally
posted by Lucky Phil
Could also be oil leaking into the cylinders. BMW motorcycles were notorious for it when left on sidestand after a good run.
|
Thanks for that Phil. How does the oil leak into the cylinders? And more importantly, how do I fix it?
So far I haven't been able to detect any fuel in the oil. It looks and smells like oil to me. But then, I'm an unreliable witness.
helbus - September 4th, 2011 at 04:41 PM
I parked our Beetle on a steep driveway once, and when leaving the house after a few hours, the motor would not turn over, it was completely full of
petrol. Hydro-locked. I drained about 10 litres of fuel/ oil mix out of the sump, and put fresh oil in and was able to get home.
Anthiron - September 4th, 2011 at 07:47 PM
| Quote: |
Originally
posted by btc-er
Have I got this right... the purpose of the cut off switch is to prevent fuel gravity feeding from the fuel tank into the carby and then into the
motor? Does that mean that if I park so that the front is lower than the back I shouldn't see the problem?
If the needle valve was leaking would that mean that I would also be running rich?
| Quote: | Originally
posted by Lucky Phil
Could also be oil leaking into the cylinders. BMW motorcycles were notorious for it when left on sidestand after a good run.
|
Thanks for that Phil. How does the oil leak into the cylinders? And more importantly, how do I fix it?
So far I haven't been able to detect any fuel in the oil. It looks and smells like oil to me. But then, I'm an unreliable witness.
|
Yes - To fix the symptom you should park with the wieght of the fuel downhill. IE: nose down.
That will not fix your leaking Needle and seat though.
Basically it is designed so that as the float bowl of the carby fills the float rises and hits the needle and seat valve. In a perfect world this then
stops the flow of petrol.
If your valve is leaking when it is in the closed position and you park on a hill so that the overflow of the float bowl is lower than the source of
fuel. The fuel will keep trickling into the float bowl, out of the overflow, down the carby throat, into the manifold, into the cylinders, past the
rings into the sump and mix with your oil.
In other words a safety cut off is a good idea. but replace the needle and seat.
Nicko