Non Runner (ETZ 125 Roadstar)

[Kenney]

Hi Out There I have an ETZ 125 Roadstar , got a problem , plenty of fuel in tank, carb has been cleaned out turn pertol tap on and petrol runs out down to carb, but will not fire up, good spark at the plug, have completely stripped carb down , but still refuses to fire up.
Any advice would be very much appreciated .
Thanks in adavance
Ken

[Kenney]

Has this message ben received ?.

[DAVID THOMPSON]

yes

take the carb off and place a shot of starting fluid in the intake and kick it over and see if it fires
even a little
or some gas if it fires then we are looking at carb again
not seen a 2 smoker MZ in person so not sure if it has a reed valve
if it has a reed valve its probably bad

dave

[mr_luke]

I take it when you stripped the carb down you found the float bowl full of petrol with no water? And that the fuel is fresh? One thing which seems to catch people out fairly often is the rubber bit on the end of the 'choke' plunger. Is it present, and attached to the plunger as it should be, buried in the bottom of the carb, or missing altogether? Assuming it's there, how are you using it to try and start the bike? The manual for my ETZ suggests it should be started from cold with the 'choke' on and the throttle completely cold. Works for me!

Does the engine have a reasonable amount of compression? If so, I'd start looking closer at the ignition. A good spark when the plug is held against the cylinder head doesn't always mean it's doing much when it's actually fitted, so a new plug would be an easy place to start. Failing that, it would be worth checking the ignition timing, and cleaning up the points.

It's a wonderfully simple engine, so in theory there shouldn't be too much to go wrong!

BTW, there will be no reed valve, to the best of my knowledge.

[Kenney]

Hi Guys many thanks for your advice, no reed valves no points it has electronic ignition, fuel is getting through to the cylinder it ignites when plug is out of engine, very wet when plug has been in engine, have changed coil, and plug cap, still no joy ???
Regards
Ken

[djsbriscoe]

Try changing the air filter and if that doesn't work drop the needle 1 groove in the carb. Is it a premix or oil pump? Make sure (if premix) that the oil is mixed 1 part oil to 50 parts petrol. If oil pump nothing much you can do. As mentioned the choke seal is often a source of problems. It would be a good idea to check the timing as well.

David