MZ ETZ 125 (1993)

[melmand]

Hi,

I was just wondering how much fuel consumption is to be expected on the ETZ 125 model?
I'm averaging 19KM/L which is pretty far from the specs (+30KM/L) in my manual. I checked the airfilter which seems good.

Thx

[DAVID THOMPSON]

my rt125 4cycle does about 55mpg (us gallon)
but do not expect very good miles from a 2 smoker if you run it fast and hard
dave

[djsbriscoe]

Is your bike a pre-mix or injector version? What petrol/oil mix ratio are you using (should be 50/1). Is the carb needle at the default position (check the manual). Is the bike starting and idling OK? Have you you taken it for a long run to burn carbon from the exhaust? I think you should get around 50 MPG as 2 strokes are total loss and not as efficient as 4 stroke engines. I get about 65 MPG on my RT125.

David

[melmand]

Actually I was wondering as to why the jet is a size #115 and not a #100 as stated in the english manual. The danish manual however states that #115 is the correct size jet. ??? Why would the danish version be running more rich than the english?

The needle is in the right place. Second from the bottom.

Also I checked the choke for proper action. The machine will die if I use it. So it's working. Never use it.

Confused? Me2

[djsbriscoe]

http://www.mzclubhungary.com/Letoltesek ... i.html#a12
http://www.mzrc-cornwall.org.uk/mod/res ... x.php?id=2

You can buy spares online from Burwin Motorcycles in London or several other places.

David.

[melmand]

Yep, as the english manual states it is supposed to be equipped with a size #100 jet. Mine on the other hand is currently running with a #115 as the danish manual states.

Check the scan from the manual I just performed.

You should be able to identify hovedstrålespids, which is the danish word for jet. It's an original manual which followed the bike from the dealer. Weird as hell.

Also notice that the slow running jet required according to the DK guide is a lot smaller. #35

[djsbriscoe]

Which country do you live in? I'd buy a 100 size jet and try that or speak to someone at Burwins in London by email. They race the bikes and rebuild the engines all the time so they can give you a definative answser http://www.mzspares.com/

This might give you some ideas also.
http://twostrokemotocross.com/2009/12/c ... nd-tuning/

HTH,

David.

[DAVID THOMPSON]

jet size may have to do with gas octane in the different country's
Dave

[melmand]

Denmark, since 1990 we have only been offered octane 92, 95 and 98. Nothing lower than that is available. Just wondering how much this could improve my fuel economy. 19KM/L is not good. My Honda XL600V will do +110KM/T and still have higher MPG.

[manumensa]

Hello

Fuel compsumption for the best performance ETZ 125 in my experience with BVF and Bing carburators
never up + - 20 kms/l.

You can down the needle a noch in BVF for save 0.5 or 1 l./ 100 kms. but you have a poor acceleration.

I didn´t saw in my country a BVF from factory with 100 main jet, all of its 115.
Also I never tried a 100 jet I supposed the bike ran in "slow motion".

I use a ETZ 125 because I have a lot of this model parts in my spare-box to save money
an I agree with you a 125cc. bike compsumption wouldn´t down 30 kms/l -only possible in
a 4 stroke-.

Best regards,
Manuel