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Guilherme Tomazini

912 UL/ULS Main Jet Size

by Guilherme Tomazini in 912 / 914 Technical Questions 7 years ago

Why is the 80hp Jet larger that the 100hp?
UL comes with 158 jet, and ULS with 155.
Why is that?

Re: 912 UL/ULS Main Jet Size

by James Ott » 7 years ago

James Ott

22 322 358

My guess is that the UL is a lower compression engine, which means that the fuel/air intake stroke draws less of a vacuum to pull in fuel. Therefore, the jet has to be larger to get the right amount of fuel into the cylinder. Just some noodling on my part.

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Re: 912 UL/ULS Main Jet Size

by tom oatman » 7 years ago

tom oatman

5 28 0

smaller displacement as well. less volume of air.

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