Oil-Gas ratios

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Farthom

New Member
May 16, 2010
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Canada
Alright, I have a grubee skyhawk 66cc angle fire engine, and the bikeberry.com manual that came with it says to use between 16:1 and 20:1 for engine break in, and between 20:1 and 25:1 thereafter. After reading a bunch of posts, I have seen lots of people recommending and/or using mixtures such as 25:1 for break in and 35:1 after. One post spoke of a mixture as lean as 40:1


I have been using about 16:1 for break in, and am nearly complete. After I have used up this tank, I would like to know what mixtures I should/could be using. I'm somewhat new to this game, and don't know all the variables that come into play here. What I do know, is that the quality of oil matters. I asked the sales rep in an auto store for a good quality full synthetic oil, and purchased the following:

PJ1 Goldfire Pro
High RPM 2T 2-stroke oil
50:1 synthetic blend

This oil was somewhat expensive, so I'm pretty sure its a good oil. I don't know what "2t" means, or what 50:1 blend means. Can someone fill me in?

Also can some of the veterans on here give me a yay or nay, on this motor oil, and some tips on what ratios I could be using?


Thanks a bunch!

Farthom
 
Pablo

Pablo

Master Bike Builder & Forum Sponsor
Dec 28, 2007
3,696
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Duvall, WA PNW
www.sickbikeparts.com
a) it depends on the oil, indeed there are some oils that work at 100:1
b) really no need for 16:1 during break in. I never have run more oil than 24:1, ever
c) never heard of that oil, but they are saying it can be run at 50:1

Mix up 25:1, and ride the bike and don't stress about it.
 
N

nolan_speed

New Member
May 31, 2010
30
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0
Seattle, WA
I'm pretty new to these engines but I've been running mine at 25:1 with Shell Natilus oil (that's what they had at the nearest gas station) and so far it's working fine. I figure that at 25:1 there is plenty of oil (most quality engines run 50:1) so the type probably doesn't matter nearly as much as if you're running an engine at the leaner ratios.

If you run a two stroke without enough oil it'll make more power for a little while but you'll burn it up and the motor will be toast. If you run it with too much oil it'll make a little less power and it'll foul the spark plug. It's obviously better to err on the rich side.

Maybe with your synthetic oil you could try splitting the difference between 25:1 and 50:1 and go for 32:1 or something? With less oil you'll make more power but you don't want to go with too little.
 
N

nolan_speed

New Member
May 31, 2010
30
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0
Seattle, WA
A fouled plug is one that is covered in oil and created a weak spark or no spark at all. When your plug is fouled the engine will be hard to start and will run like crap, especially at lower RPM, sometimes running the engine really hard will burn off the plug and it'll start working well again.

If running it hard dosn't work, remove the plug and you'll notice that it's black an oily and will need to be cleaned or replaced.
 
JG88cc

JG88cc

New Member
Sep 22, 2010
15
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0
San Diego
It would be a great idea to switch to a spark plus with a resistor at the end. They are made to prevent fouled spark plugs. I just bought a NGK BPRGKS.

Not saying you shouldn't carefully mix your gas/oil (you really should). But its a good idea.
 
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