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rhino carb issues

This is a discussion on rhino carb issues within the Engine forums, part of the Technical category; just brought a new to me 06 rhino 450. The previous owner couldn't keep it running so I bought it worth the money. The problem ...


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Old 01-14-2008, 06:41 AM
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rhino carb issues

just brought a new to me 06 rhino 450. The previous owner couldn't keep it running so I bought it worth the money. The problem is the engine coughs and back fires thru the carb. The only way to keep it running is with the choke pulled out or lots of throttle. When slowing down for corners the motor coughs and will back fire thru the carb and kills the motor. The previous owner had turned the idle screw up but that didn't help. So far this morning I have taken off the air filter, which was really dirty, started the rhino w/o the filter, but it's still coughing and back firing thru the carb. What are the proper adjustments? How many turns? Any advise on the carb would be great. I'm thinking I need to pull the carb and give it a good cleaning. Thanks again for any and all advise, Cman.
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Old 01-14-2008, 06:59 AM
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The carb sticky has a lot of info...

How to jet a carb (Getting a little hot)

Replace the fuel filter...

Yes, clean the carb...

There are a host of possible causes...the most common is the fuel fitler...another is a clogged pilot jet...

Make sure your return line and tank vent are not blocked...make sure the roll-over valve on the vent line works...

Check the fuel level in the float bowl...

Make sure there is no gas in the overflow...if you use clear tubing for the drain and put a trap/loop in it and there is overflow you will see the gas in the tube...

Replacing all the fuel lines with clear tubing always helps isolate problems..

The fact that you have to use lot's of throttle and the choke (which is not a choke but a fuel enricher) is an indication that you may have a clogged pilot jet...and/or a severely misaligned idle a/f mixture...

The pilot jet provides the bulk of the fuel at low rpms...if it is clogged...you will rely on the mainjet for all the fuel at low speeds...in order to get the mainjet to supply that much fuel you have to open the throttle quite a bit...

Another thing you should do is inspect the spark plug...
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Last edited by tyrap; 01-14-2008 at 07:13 AM.
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Old 01-14-2008, 07:00 AM
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sounds lean. I would first check the fuel filter. if that doesnt help check the idle mixture.
When yamaha drills the holes in the tanks they don't clean them out too well. I've has a couple of 660's pop cause of that reason.
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Old 01-14-2008, 07:26 PM
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Well today I cleaned the air filter, pulled the carb and removed the 3 jets, sprayed carb cleaner thru the jets and passages, then blew compressed air thru the jets and carb itself. The carb looked clean, as no dirt or sedimet found in the bowl or jets. Has a newer fuel filter, which is clear and I see is full when running the rhino. After all this the rhino runs somewhat better but still is poping thru the carb, and once is throughly warmed up just barely will stay running until a cough thru the carb, then that kills the motor. Tomorrow I will run some Sea Foam thru the tank to make sure there is no miosture in the tank, and will pull the spark plug and check it. Do you think I should pull the carb again, even though I didn't find any dirt? It is an 2006, and the inside of the carb looked clean. Any and all advise is really great. Thanks to all, Cman.
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Old 01-15-2008, 07:32 AM
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Sounds like you have a leak with the intake somewhere. I'd check for small cracks near the carb somewhere, especially if it feels too icy.

John
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Old 01-16-2008, 06:53 AM
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I did and will dbl check for intake leaks. I know the first time I re assembled the carb to the intake I hadn't seated it correctly. So I will check again this morning. Also this morning I will put a can of Sea Foam in , pull and check the spark plug, clean or replace it which ever it needs. The Rhino is running some what better, but wont idle, still coughing thru the carb while trying to idle, and that kills the motor. Thanks for the advsie, hopefully will get this figured out, cman.
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Old 01-16-2008, 07:26 AM
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Check the valves, a leaky intake valve (either tight or burnt/worn out) will cause a backfire through the carb.
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Old 01-16-2008, 08:37 AM
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I think I just found the problem. There is a tube about the size of a fuel line between the carb and the intake, at 12 o clock, when I put my thumb over the end of the tube, the rhino runs PERFECT. I think all I need to do is find out where to plug the line into or maybe just plug it. Thanks for all the help and advise, hope I can do the same some day. Again, thanks, Cman.

maybe perfect was a little to strong, because there is still a slight cough thru the carb when holding my thumb over the line, no doubt its a vacoom line and maybe if I find where to plug it into that will cure the final cough thru the carb.

Last edited by cman; 01-16-2008 at 08:57 AM. Reason: Automerged Doublepost
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Old 01-17-2008, 03:50 AM
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any idea where this vacuum line plugs into?
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Old 01-17-2008, 08:22 AM
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Pics please.
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Old 01-17-2008, 11:26 AM
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That may be the vacuum line for your fuel pump.Should plug up above where your fuel filter is located, mine has 2 protective covers and loops through a clamp with the fuel supply line.
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Old 01-17-2008, 03:19 PM
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Quote: Originally Posted by tj4667 View Post
That may be the vacuum line for your fuel pump.Should plug up above where your fuel filter is located, mine has 2 protective covers and loops through a clamp with the fuel supply line.
That very well could be, I found out today that he put a Napa Auto Parts fuel pump on because an OEM fuel pump was so high. I'll see if there is any where that looks like it could plug into.
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Old 01-17-2008, 03:40 PM
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Personnally, I would go back to the stock pump and connect all lines correctly.

The carbs do not take too much fuel pressure in the first place. Tyrap could help you here most likely.

Rog
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Old 01-17-2008, 03:48 PM
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The stock fuel pump in a rhino has the correct psi for any carb.
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Old 01-17-2008, 04:32 PM
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Quote: Originally Posted by 07fj View Post
Personnally, I would go back to the stock pump and connect all lines correctly.

The carbs do not take too much fuel pressure in the first place. Tyrap could help you here most likely.

Rog
That is exactly what I would do also...

I am assuming that the pump he put on was electric...

Some will argue but I am 4-square... dead-set against electric pumps on atvs...

Also...for every person I had read say they love the electric I have read 20 more asking how to make it work right...

If that line you are reffering to goes to the intake manifold and was left open that is a serious problem...

If it is the line off the carb itself...it is either a vent tube which cannot be sealed...or it's the vacuum line from above the diaphram to goes to the intake hose that connects the carb to the airbox...leaving that open is also serious problem...capping it will not damage your motor but will make it run bad...

You need to clarify what you are talking about with pics...

Quote: Originally Posted by 1FAST06 View Post
The stock fuel pump in a rhino has the correct psi for any carb.
True...

The stock set up works very well if you know how to make sure it has no malfunctions that need correcting...
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Last edited by tyrap; 01-17-2008 at 04:34 PM. Reason: Automerged Doublepost
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