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post #1 of 5 (permalink) Old 11-04-2009, 07:19 AM Thread Starter
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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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post #2 of 5 (permalink) 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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post #3 of 5 (permalink) Old 11-04-2009, 07:26 AM Thread Starter
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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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post #4 of 5 (permalink) 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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post #5 of 5 (permalink) Old 11-04-2009, 01:43 PM
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The 04 had a 155 stock main in it.

2008 Polaris RZR 800, long travel kit, Rhino brand axles, Offset A-arms, XP shocks, New front differential with billet cage, PA doors, Super ATV 4500 pound winch.
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