MZ Saxon

My MZ is driving me nuts. It keeps cutting out, fuel starvation. I cleaned
the (Bing) carburettor, which was full of muck, fitted a new fuel pipe and
an inline fuel filter. Went to Harlow yesterday and it didn't miss a beat,
coming home the same thing, just cuts out. I then found out there was no
fuel coming from the tank, by pulling the fuel pipe off the carb. Releasing
the filler cap made no difference so it isn't an air lock in the tank. For
want of a better idea I blew into the fuel pipe, heard the bubbles in the
tank and fuel began to flow. Hooked it back onto the carb and rode home,
except it happened twice more in about 15 miles, and the same cure got it
going again. I have just stripped and cleaned the fuel tap, although could
find nothing wrong with it, and there is not a trace of dirt inside the tank
(no rust, the tank is plastic).

Apart from putting it on Freecycle, anyone any ideas. Getting shot of it is
an attractive idea. I have not yet got from Sudbury, Suffolk, to Harlow and
back without something going wrong with the bloody heap of crap. I have had
several MZ's, but this heap has got to be the worst ever. I am seriously
thinking of breaking it and flogging the bits on Ebay.

TIA

Bill

 

Dodgy fuel valve , crap in the tank (doesnt need to be rust) a small
peace of clear plastic is near invisable in a tank full of fuel.

If you can blow into the fuel pipe and get bubbles and it goes again it
definatly sounds like a piece of crap , tank sealant , bit of gasket or
the likes around the fuel valve , try replacing the fuel valve and its
gasket or seal , when you have it stripped blow the tank out , if your
card ws full of shit then its obvously come from the tank .

You could try flushing it out with a hosepipe if you cant get to an
airline ,

Dont use a vacumm cleaner to try and suck it out , my daughters dopy
boyfreind did that , was funny to watch though

--

 

The tank is really clean. It has to be the fuel tap, virtually can't be
anything else. It is a very simple mechanical tap, no vacuum or anything.
You can see right through all the cut outs and channels and they are all
clean, the rubber seal looks perfect, no wear or distortion, I would say it
is OK, but simple elimination of possibilities says it must be the tap even
though I cant see why.

I will give Burwins a call and see how much they want for a tap, if they
have one.

 

Some taps can have thier seals changed

--

 

Most fuel taps have a fine mesh filter protuding into the tank. These
can easily get blocked with crud.

Have you checked the tank breather ?. On bikes this is usually just a
small hole in the cap. If the breather is blocked the fuel will be held
in the tank by a vacuum. The easy way to check for breather problems is
to ride/drive without the filler cap.

 

*cough*

"Releasing the filler cap made no difference so it isn't an air lock in
the tank."

 

Looks like a new valve and seals then plus a new strainer

--

 

Saxon carb

Hi there, sorry if this in the wrong place, but it seems right...
I have just bought a 500 (Rotax) MZ Saxon Tour and |I have a problem with the choke, which refuses to slide and obviously I don't wish to force it.
Problem is that I don't actually know the type of carb, so it's difficult to find information on how to strip and/or service.
The bike is P reg (1996)
Is it a likely to be a Bing or DellOrto - or some other?
Thanks for any help.