Probs with TS150

[suzukix7]

Hi guys,
My TS150 wouldn't start today.
It did start initially but then refused to yield.
When I turned the petrol tap on I couldn't see any fuel flowing in to the transparent pipe, take the petrol pipe off and fuel flows. I can
top the fuel pipe up by holding it underneath the tap.
Still wouldn't start though.
There was a healthy spark but still nothing, fuel does appear to be getting to the plug.
The spark then stopped but this coincided with the battery running low on juice......Am I right in saying that the battery needs to be well charged for MZ's to run?

Dave

[Agronski]

You'll probably find that anything less than 6.0V won't give enough spark to ignite the mix. In case you don't know - don't leave your ignition on for long periods without the engine running - the ignition coil will always be drawing current and can burn out (or worse, go sour and start working intermittently). If the points are closed, the coil can draw up to 4 amps off the battery when the engine isn't running and pull the battery voltage down to about 5V. Get a multimeter and check a few things.

Now's a good time to check your battery electrolyte levels, charge regulator settings, and possibly even the condensor and regulator-resistor (under the right side crankcase cover). Condensors can go sour after being sat a long time, and are cheap to replace. If you've got an electronic regulator, forget about the resistor. If you've still got the mechanical reg, check the resistor and contact-gap settings, as shown here: http://www.sweller.co.uk/mz/electrics/dyn_wrdia.html

If your plug is reliably getting fuel, your regulator is working and you get a good spark with 6V+, it might be your compression is low. Either piston rings or crank seals or both. Borrow a compression tester, maybe.
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[suzukix7]

Many thanks for the detailed response.

I have the battery on charge and will try again tomorrow.
If there still isn't any joy, I will test the components you have suggested.
Bike has been standing for a number of years, so I am expecting problems.
Owned bikes for 30yrs and I always thought MZ's would be a piece of cake............how wrong was I!!!!
Electrics are not my strong point lol

Dave

[DAVID THOMPSON]

when they stand for a long time seals become a problem
be happy its not a twin on them there is a seal in the middle of the crank on most bikes

which means seeing a crankshaft shop

dave

[therealche]

Unless, of course it's an Ariel Arrow, or Adler MB250!