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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


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Old 08-22-2006, 06:23 PM
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MattR MattR is offline
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Default FAQ: Premix Calculations

Question:
The GasGas manual specifies a premix ratio of 50:1 (or 2% oil). How do you determine the required amount of oil for different quantities of gas?

Answer:
The manual does specify 50:1. However, many riders have found other ratios such as 40:1 and 36:1 to work well in GasGas bikes. Personally, I like to use 40:1 in my bike. There are products on the market such as "Ratio Rite" which help riders determine the amount of oil per gallon of gas.

A better method for determining the oil for any quantity of gas is to develop your own premix table. Your premix table will allow you to determine oil for smaller quantities of fuel (such as emergencies on longer rides) or mix up larger quantities of fuel before a ride.

Here are premix tables that I have created for reference. I created tables for the most common premix ratios. You can print out these tables for your fanny pack or garage use.









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Last edited by MattR; 08-23-2006 at 06:03 PM.
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Old 08-28-2006, 11:35 AM
flybars flybars is offline
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Default Premix Calculations

Sweet! Takes all the guesswork out of it. Eliminates mistakes.
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Old 08-31-2006, 06:12 PM
tprnottp tprnottp is offline
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Matt,

You be da man!

Thanks for doing the leg work for the rest of us.

TP
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Old 09-01-2006, 07:37 PM
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Thanks! Glad you liked them.
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Old 09-04-2006, 04:12 AM
Hawkeye Hawkeye is offline
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My brother did a similar chart many years ago, but he just picked his ratio and then listed the oz. needed to mix with gas in tenths of a gallon. He formatted it out to look like a rollchart and then taped it to his front fender or his gas tank. When we trailrode, like the Six Days of Michigan, it worked great to get the proper ratio in your tank after topping it off at the gas pump.
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Old 07-23-2009, 07:06 PM
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Here is a table for 43:1 premix ratio:
As you can see, this makes it easy with 3 oz. per gallon.

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Old 07-23-2009, 07:30 PM
Brian VT Brian VT is offline
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I like the 3 oz. per gallon rate.
I pack an 8 1/2 oz. Listerine bottle of oil. It's flat and sturdy. I pour in oil and make marks for every 1 1/2 oz.
I've never used all 8 oz. but there always seems to be someone who forgot to pack oil.
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Old 08-15-2010, 06:49 AM
lankydoug lankydoug is offline
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If you're home and or have access to the internet here is a link that is useful. If I top off my fuel storage can before a trip I can enter the decimal amount and get the exact calculation as well

http://www.qddev.com/demos/sprockets...etpremix.shtml
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Old 06-02-2011, 06:16 PM
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Man I'm glad we went metric back in the 70's. All this stuff is so much easier to figure out in litres versus gal. When working in litres just convert to ml ( litres * 1000) and divide by your mix ratio. So for mix ratio of 36:1 for 20 litres of fuel just divide 20000 by 36 = 555 ml
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Old 07-26-2012, 12:58 PM
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Hi all, I thought this would be the right place to post this. What do you think about 1.7-1.8 % oil ratio? The local gasgas dealer and mechanic, very experienced on riding, racing and maintaining 2 strokes mostly GG and Husaberg, swears by using 1.5% or 66:1 (!!!) on his bikes, even on his 125 2012 husaberg. His claims: less spooge, better performance without risking to seize the piston and bearings. Also he insists on Agip premix oil. What is your opinion on the subject?
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