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Old 04-07-2010, 09:14 PM   #1
tony zambos
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Default Rotax Jetting Range for the Midwest - Again

What would be the greatest range of jets would I likely need for an 09 Rotax Sr and do I need to have every jet within that range? Planning on sprint racing in Indiana and Illinois, and road racing in MI, WI and IL. A search showed that Chris Lobaugh answered this question back in 2008 with a range between 155 and 168. Have heard that with the 09 motor, the bottom of the range might be as low as a 140.

Thanks in advance,
tony
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Old 04-09-2010, 11:03 AM   #2
Chris Lobaugh
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140 sounds a little lean for the midwest but with the new style airbox it possible that you might go as low as 145
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Old 04-09-2010, 11:07 AM   #3
Chris Lobaugh
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probably don't need to have every jet...at least not to begin with. A common jet kit would be 145, 148, 150, 152, 155, 158, 160, 162, 165, 168.
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Old 04-09-2010, 04:22 PM   #4
tony zambos
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Thanks Chris. I am assuming that the temp on the day we get to break the engine in will be in the 60's. We're going to be using Marc's break-in procedure. I'm also assuming that a new engine will come with a 168 jet and that should be on the rich side, but OK for break in.
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