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912ul main jet

by Andrew Dunning in General Tech Discussion 6 years ago

Why does the 80hp 912ul have a larger main jet than the 100hp 912uls?

Andrew

Re: 912ul main jet

by Roger Lee » 6 years ago

Roger Lee

127 5.2k 4.78k

It also has a different needle size. It's just the way the fuel delivery needs to be for a different size cylinder setup and compression. Something some engineer figured out a long time ago and then was proven on dyno testing.
Here's a list of jet sizes that may be in the 912UL, 912ULS and the 914. Not to mention the 914 has one needle clip in a different slot than the other. If you live at high altitude and fly high all the time you may have both needle clips in a leaner position.

261-607 NEEDLE JET 2.72
261-608 NEEDLE JET 2.70
268-985 MAIN JET 160
268-984 MAIN JET 155
268-996 MAIN JET 158

963-143 IDLE JET 35

268-758 JET 85
268-762 JET 105
268-763 JET 130
268-765 JET 140

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Andrew Dunning

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Re: 912ul main jet

by Andrew Dunning » 6 years ago

Andrew Dunning

1 31 86

Thanks Roger,

A few mates were wondering if it was a typo when I told them that the 80hp needs a larger jet than the 100hp.

Andrew.

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