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post #1 of 5 Old 06-25-2011, 08:34 PM Thread Starter
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Back Firing

I have a 2011 400HO Ranger. It back fires after it reaches running temperature at high rpm's. I only notice it when running at near top speed and then let off the gas. Just wondering if anyone else has had the same experience.
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post #2 of 5 Old 06-25-2011, 10:09 PM
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I have had backfires on other small engines, and it always been related to fuel and/or the carburetor. Adjusting it helps, but if just started backfiring and didn't do it before, then I would think a cleaning of the fuel system would be where I would start, before I start adjusting things.

But first, check with your dealer for recalls... there are some on 2011s.
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post #3 of 5 Old 06-26-2011, 05:51 AM
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Water (moisture) in the fuel can cause back firing in small engines. I would make sure the fuel you are using does not contain ethanol as infrequent use can cause such problems with the fuel.

Mississippi requires all fuel pumps to list ethanol content over 1%.



The following piston engine applications should not use ethanol blended gasoline:
  • Any 2 cycle engine used in tools, watercraft, snowmobiles, etc., or small 4 cycle engines.
  • Any engines used in an emergency stationary engine application like a generator or a pump, especially in a humid climate.
  • All watercraft. Ethanol blended gasoline should never be used in a marine environment.
  • Antique and classic cars and classic motorcycles.
  • All aircraft.

Mike
2016 RZR 900 EPS Trail - Matte Turbo Silver
Protected by AMSOIL Synthetic Lubricants

Last edited by Z71; 06-26-2011 at 05:54 AM.
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post #4 of 5 Old 06-26-2011, 06:26 AM Thread Starter
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Thanks for the responses. The machine has 55 hours on the meter and has acted this way from the time it was new. I also think the vavles are too easy to rattle under a load. I use pure non-ethanol premium gas. I did run regular with ethanol at first, so it could have a little water in the tank. I pondered installing a water/fuel separator on this machine when it was new. I think I will do that after my next pay day. After switching to pure premium gas, the motor ran smoother and valve rattle lessened. I will let you know how the fuel/water separator works out. Thanks again for your thoughts.
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post #5 of 5 Old 06-26-2011, 06:43 PM
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If it has been acting that way since new, I would take it to the dealer and get it fixed under warranty, while you still can.
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