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Old 05-02-2011, 03:19 PM   #1 (permalink)
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Gas percolating in tank

I have a 2005 Rincon 650 that runs fine. The problem I am having is that when it gets hot out on trail and you shut off the motor you can hear the gas in tank percolating/boiling and lots of fumes come out of the vent tube. The hot light has never come on and I seldom hear the fan running. I tried putting some insulated tape on the bottom of the tank and flushed the radiator. The outside of radiator and oil cooler are clean and I seldom get the bike muddy. Usually just ride trails. Is there a way to check to see if the engine is overheating and maybe the temp sensor is not turning the fan on and activating the hot light? Thanks
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Old 05-02-2011, 03:35 PM   #2 (permalink)
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From what I have seen the Grizzly and the Rincon have this problem. As far as I have read, it is not a problem with the Engine, but the way the Gas Cap vents???? There was a member on here who posted that he fixed his with Exhaust wrap I believe. Let me see if I can find it.
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Old 05-02-2011, 03:42 PM   #3 (permalink)
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Well, so add Rancher to the list, and Polaris too...

420 Rancher Gas Boiling
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1996 TRX300FW - ITP Mudlites Warn XT25 (Current Project)
2001 Suzuki LT A50
2003 TRX300EX
2006 Polaris Sportsman 90 - 2 inch lift
2006 TRX250EX - Maxxis Razrs
2007 Suzuki King Quad 700 4x4 - ITP Mudlite XL
2008 TRX450ER - No Lid, HRC Kit, 162 Main, 45 pilot, 55 leak jet

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Old 05-02-2011, 05:27 PM   #4 (permalink)
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That was me, The header wrap didn't help, when i went to Chadwick the other day it boiled on me again. I don't know what to do about it.
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Old 05-02-2011, 05:43 PM   #5 (permalink)
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I have the same problem with my 700 Grizzly it is boiling the gas, i can remove the rollover valve and put a fuel filter on it and that is suppose to stop it but if you roll it then the rollover valve wont stop the fuel from coming out cause its not there anymore but not to much to worry about the way most quads today have all the motor covered in plastic body panels it will be hard to spot this problem bet it does not doit in the colder months, i am just goin to keep ridin mine and deal with it.
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Old 05-03-2011, 08:26 AM   #6 (permalink)
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I have been waiting for this to pop up. My 2011 Rincon gets very poor fuel mileage on hot days so I was thinking the fuel tank is getting hot and evaporating the fuel. I guess this answers my question.

Now for the next question: What are we going to do to correct this???
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Old 05-03-2011, 09:13 AM   #7 (permalink)
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This problem isn't isolated to just one make or model, from my research there have been Rincons, Ranchers, Grizzly 700, Oulander Max 400, Ranger XP 800, Polaris 800 ATV, Grizzly 660, Raptor 700, 450 Kodiac, That's just the first 4 pages of Googling "ATV Gas Boiling". Some of these guys have had gas come out of the tank from bubbling after taking the cap off. I've checked my cap and the vent is working both ways so I cant see the tank getting a vacuum on it to cause the boil, as stated before a vacuum will cause gas to boil at low temps, my problem is not a vacuum, instead the tank is building pressure, I can look at the vent tube and see the fumes being forced out very fast. To answer your question if i have a plan? yes. It is here at this post. 420 Rancher Gas Boiling
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Old 05-03-2011, 09:21 AM   #8 (permalink)
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Quote:
Originally Posted by Hillbilly View Post
This problem isn't isolated to just one make or model, from my research there have been Rincons, Ranchers, Grizzly 700, Oulander Max 400, Ranger XP 800, Polaris 800 ATV, Grizzly 660, Raptor 700, 450 Kodiac, That's just the first 4 pages of Googling "ATV Gas Boiling". Some of these guys have had gas come out of the tank from bubbling after taking the cap off. I've checked my cap and the vent is working both ways so I cant see the tank getting a vacuum on it to cause the boil, as stated before a vacuum will cause gas to boil at low temps, my problem is not a vacuum, instead the tank is building pressure, I can look at the vent tube and see the fumes being forced out very fast. To answer your question if i have a plan? yes. It is here at this post. 420 Rancher Gas Boiling
Yeah, I knew Grizzly, Polaris and Honda had the issue. For what it's worth, I saw Grizzly people fix theirs without doing anything to the rollover valve. I'll try and find it.
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1996 TRX300FW - ITP Mudlites Warn XT25 (Current Project)
2001 Suzuki LT A50
2003 TRX300EX
2006 Polaris Sportsman 90 - 2 inch lift
2006 TRX250EX - Maxxis Razrs
2007 Suzuki King Quad 700 4x4 - ITP Mudlite XL
2008 TRX450ER - No Lid, HRC Kit, 162 Main, 45 pilot, 55 leak jet

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Old 05-03-2011, 09:26 AM   #9 (permalink)
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When they say rollover valve, are they referring to the gas cap? i noticed when i shook my cap i could here something inside it, I'm wondering if this is sticking causing the pressure then releasing once so much pressure builds.
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Old 05-03-2011, 10:05 AM   #10 (permalink)
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I'm not familiar with your model at all. If I had one, I'd look in the manual for the check valve and then replace it with a NAPA clear filter just to "try it". That's what all the Grizzly people say solved the issues. The only issue I see with this is the vacuum? Someone put a stone in theirs to catch dirt when the grizz went into vacuum. ?????? Not sure.

Here is the rollover valve on the Grizzly...must be what they call the "check valve" too?

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> Click Here for Answers to Cleaning, Compression, Jetting, Carb Issues, Model Specific problems etc.

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1996 TRX300FW - ITP Mudlites Warn XT25 (Current Project)
2001 Suzuki LT A50
2003 TRX300EX
2006 Polaris Sportsman 90 - 2 inch lift
2006 TRX250EX - Maxxis Razrs
2007 Suzuki King Quad 700 4x4 - ITP Mudlite XL
2008 TRX450ER - No Lid, HRC Kit, 162 Main, 45 pilot, 55 leak jet

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