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Carb jetting

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mmatt

Well-Known Member
Joined
Apr 13, 2015
Messages
315
Location
Canada
Is there a rule of thumb for jetting? Specifically a Bing 54 on a Rotax 503?

I live in an area where we get a very wide range of temperatures. We also experience vast swings in humidity. With temps as low as -40C in the winter and as high as +40C in the summer, getting my engine to run in a constant EGT range is a bit challenging. This year I juggled two sets of main jets, needle jets, jet needles, and experimented with clip positions on the needles as well.

It was a lot of messin around and I'd like to simplify my ops by just swapping jets since they're the easiest to get at. I was just gonna buy a few steps up and a few steps down and experiment but they're a bit too pricey to be doing that.

So is there a rule of thumb for the EGT change between jets? For instance; if I were to change the 155 main jet for a a 160 main jet, what would the difference in the EGTs be?

Hopefully with your help I can narrow down the number of jets I have to buy. :)
 
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