Fuel issue

TStanb

TStanb

Full member
Hi
There is fuel pissing out of the middle carb at this location. What is my next move?
Cheers
 

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Yep looks like it?s a stuck float.
Bloody awkward to get to and those bastard fuel pipe clips??!!
 
When running Dellorto's or Mikuni Carbs there is a coherent check (Learned from your experience) which you have to do before firing up the engine.

Thank the GOD's for EFI BUT then there's the Electrical Matter.

Actually I prefer MFI (Mechanical Fuel Injection) (Constant Flow Fuel Distributor with a Pill) which hasn't existed since 1974 - Don't even need a Battery with it  ;o)
 
TStanb said:
Yep looks like it?s a stuck float.
Bloody awkward to get to and those bastard fuel pipe clips??!!
Click to expand...
Give the carb a sharp tap with the arse end of a large screwdriver...
 
Had that on a Snowy Ride once, carb breather had melted on the collector and sealed over. The same thing happens on dirtbikes with long deep creek crossings, kills the engine mid creek. The fix for that is a T in the breather and an added line up high under the tank.
 
"There is fuel pissing out of the middle carb at this location. What is my next move?"

if you need to ask that question, I suggest you need a professional or a learned amateur in the flesh,to help you
CLEM
 
Ignore Clem  :P.  He must be having bad day  :-*.  We all have to start learning somewhere ...

Just so you know, that hole is the air intake/breather to the float bowl.  If fuel is coming out of it, it means there's too much gas in the float bowl - hence the advice to check your float valve is closing properly (it won't be ...); and also the float heights (but they don't suddenly go out of whack.  So, float valve .. :D)

Love you really, Clem (yer miserable old ...)

Craig
 
On investigating, it appears that the  float needle valve is not sealing even when the float is manually raised with finger. Foreign object in the valve seat? I recently replaced all of them with modern fuel proof needle tips.
Before I go any further, I need to know if this is a carbs-off job or whether it can be viewed more closely and fixed in situ. I have to say this is doubtful as I am unable to access much at all
 
You can remove the floats with the needle in situ on the bike, extract the pin and have rag to catch the needle if it falls off the floats, a bit of a fiddly job. The seat can be removed/replaced with a small deep socket (8mm?), do not lose the small fibre washer for the seat. Easier with carbs off but i have done it in situ in the dark beside the road. The gauze filter on the banjo is extremely fine, not much can get through it.
 
Do you have a cheap fibrescope that plugs into an Android phone or a laptop? Dirt cheap on eBay. Not saying it's the answer to all remote visualisation problems, reflections inside metal objects are often too bright to see anything, but it might help.
Usually problems like this are caused by rust in the tank. Have you checked? Lots of discussion here about rust removal and tank sealing products. It's a pain but it can be done.

Ken
 
my apologies to you Tim and my thanks to Craig for shouting me down, he was right to do that,,
my post was harsh, we are here to help and want to continue to do so,
my instant reaction was that if fuel is coming out of the vent then it is definitely running into the cylinder, and the air filter if you have one, under these conditions you should not start the engine, the two outer and running cylinders will force the centre, and fuel of fuel one over TDC (top dead centre the highest point of piston travel in the bore) and very likely bend (as in shorten) a con rod,  this will be caused by the excess fuel in the cylinder being put under hydraulic lock conditions, highly undesirable.

Take the carbs off, its not hard, you already know that they come off in a "bank", disconnect throttle cable at the quadrant, unscrew (countersunk screw on side of carb) the three choke cable connections and pull out all three plungers, loosen the carb clamps, remove the inlet rubbers, do not wiggle the carbs, just "pull" them off, WD40 helps here when refiitting to give a degree of lubrication for the future removal
if you are only working on the float bowls it is not necessary to disconnect the carbs from the bar fixings, but for checking the float heights this is then a must.

Maybe when you fitted new seats and float valves you missed a fibre washer under the new seats?

CLEM
 
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