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backfiring

This is a discussion on backfiring within the Engine forums, part of the Technical category; i have a 2004 660 that when ever im in higher altitude places it backfires when letting off the gas. how do i get it ...


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Old 11-04-2009, 07:19 AM
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backfiring

i have a 2004 660 that when ever im in higher altitude places it backfires when letting off the gas. how do i get it to stop? do i need to change the jets? down in the valley it runs fine and doesnt backfire but as sson as i go to crown king or munds pard area it starts. any suggestions?
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Old 11-04-2009, 07:24 AM
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Sounds like a rich backfire. Go down a little on your jetting. If the elevation is not changing more than 3000' or so you should be able to find a "happy medium" on jetting.
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Old 11-04-2009, 07:26 AM
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now since i know nothing about how to do this can i adjust them myself or do i need to buy new ones
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Old 11-04-2009, 07:31 AM
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Search "jetting your carb" on the site. There is a very detailed thread on how to do it.
You will have to pick up a couple jets from yamaha or anyone that stocks mikuni jets. If I remember correctly the stock main is a 145 in most rhino's, but it could be a 150 in the '04.
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Old 11-04-2009, 01:43 PM
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The 04 had a 155 stock main in it.
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