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Dirt Bike Mods & Maintenance
Biggest factor of fuel/oil that affects jetting
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[QUOTE="jaguar, post: 1470984, member: 19340"] At a ratio of 25/1 there is 96% gasoline and at 37/1 there is 97.3% gasoline which is only a 1.3% difference in how much fuel the engine is getting which is a very tiny difference. What does make a big change is the different oil viscosities so that if you change your engine oil to one with a higher or lower viscosity then that will change the overall viscosity of the fuel/oil mixture. Let's compare Maxima Scooter Expert with a 40C viscosity of 56 to Super M with a 40C viscosity of 96. Gasoline has a 38C viscosity of .55 so with a 37/1 fuel/oil ratio the mix with Scooter Expert has a final viscosity of 2.05 and the mix with Super M has 3.13 which is a 34% difference which is huge. So even if there is a factor I'm failing to consider here then you still have to admit that it is the elephant in the room that everyone has missed all these years. I don't know if you've noticed but on many different sites the engine tuners have recommended selecting a fuel/oil mix and to stay with it, implying that if you change any of the three elements then you'll change the jetting: fuel, oil, fuel/oil ratio. I picked a moderate change in oil viscosities for this example but oils range from 36 to 120 or more. So my advice to you is don't worry about the fuel/oil ratio as much as the viscosity of the oil you are using and that when you change to another oil spend the time to check the jetting before riding it hard for a prolonged period of time. Many engine oils with all their data, including 40C viscosity, is on my oil page at [URL="http://www.dragonfly75.com/moto/oil.html"]www.dragonfly75.com/moto/oil.html[/URL] [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Biggest factor of fuel/oil that affects jetting
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