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Old 09-23-2008, 05:34 AM
Merlin Merlin is offline
Motorized Bicycle Member
Join Date: Sep 2008
Posts: 20
Default help: 2stroke oil - too much or not enough? new to 2strokes

Hi all,

my Zbox [66cc] is the first 2stroke motor I've ever had to deal with, where you have to mix your own oil. The only other 2stroke I've owned is my wife's bike in Thailand, which is a Honda 110cc. It has a separate oil tank, and a light on the dash to tell you when it wants more oil.

But I've never had to mix 2stroke fuel and oil before.

I got my first 5L can, and as the instructions said to use a 16:1 ratio for running I calculated that to be a little under 300ML. So that's what I did, and the little motor starts and runs and seems pretty much ok. It's a noisy ***** though - you can't hear the exhaust noise over the chain, gear and a high pitch ringing sound from the top end [I think]. Maybe it's the piston knocking? I don't know. Do they get quieter after they're run in?

anyway, I'm off track.

What are the consequences if you get the mix wrong?
I guess if have not enough oil you will kill the motor, especially when it's new.
But what about if you have too much? Just as bad?
What about after it's run in - is it better to run a bit extra oil for safety?
Or is there a performance hit for having too much oil in the mix?

The other thing I'm wondering about is:
How do you guys who ride these things every day handle the practicalities of refueling? Do you carry some oil with you and add it in when you stop at the petrol station? How do you figure the correct amount to put in if you don't know how much the little tank is going to take? Or do you keep your fuel premixed at home, and fill up before each trip?
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