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Rhino backfires

This is a discussion on Rhino backfires within the Engine forums, part of the Technical category; I have a 2007 660 Rhino. I put an aftermarket billet exhaust tip on the exhaust. The only difference between stock and the billet tip ...


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Old 03-18-2007, 06:29 PM
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Rhino backfires

I have a 2007 660 Rhino. I put an aftermarket billet exhaust tip on the exhaust. The only difference between stock and the billet tip is increase from approx. 1 to 1.5 opening, and the billet tip is straight.

Ever since changing the exhaust tip, the Rhino backfires when I let off the gas.

The motor and carburetion is bone stock. I have a BRP CDI but I had that with no issue before the tip change.

Can anyone provide info on what the issue might be?

Thanks a million!!!

Rob
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Old 03-18-2007, 08:33 PM
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Quote: Originally Posted by Rob4092xx View Post
I have a 2007 660 Rhino. I put an aftermarket billet exhaust tip on the exhaust. The only difference between stock and the billet tip is increase from approx. 1 to 1.5 opening, and the billet tip is straight.

Ever since changing the exhaust tip, the Rhino backfires when I let off the gas.

The motor and carburetion is bone stock. I have a BRP CDI but I had that with no issue before the tip change.

Can anyone provide info on what the issue might be?

Thanks a million!!!

Rob
I believe the exhaust tip requires rejetting .....
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Old 03-18-2007, 08:40 PM
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tweeking your a/f is the solution I believe. It helped me and I've read it several sites that talk about jetting.
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Old 03-18-2007, 08:44 PM
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mine backfired for the first time yesterday and i didnt change a thing.
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Old 03-18-2007, 08:44 PM
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I know nothing about jetting only what I have read .... so I agreee with Chandler...
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Old 03-18-2007, 08:47 PM
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Fuel filter might be dirty?
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Old 03-18-2007, 08:53 PM
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Mine used to do that... with the same mods...

I took it to KMS and they re-jetted the carb, problem solved.
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Old 03-19-2007, 09:02 AM
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Quote: Originally Posted by alex053 View Post
mine backfired for the first time yesterday and i didnt change a thing.
That could be from running a low octane fuel .... Mine backfires with anything less than 91 octane ....

Also if you run it at high speed for an extended period of time and then let off of the throttle it may backfire ....
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Old 03-21-2007, 03:25 AM
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Adjust your fuel mixture screw slightly richer and it should cure your problem. Mike, if you backfire with anything less then 91 octane you should probably do the same thing. 91 octane resist the backfire more than 87.
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Old 03-23-2007, 03:20 PM
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Where is the fuel screw and how do I get to it?

Which way do I turn it?

How many turns?

Thanks for everyone's help!

Rob
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Old 03-23-2007, 04:16 PM
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The fuel mixture screw. I called it the A/F screw in this picture. 2 turns out is normally good.

You need to put a small drill into the brass plug and either insert a screw and pull it out. Mine came out while I was drilling it.

Turn the screw in until bottomed and then 2 turns out.

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Old 03-23-2007, 06:06 PM
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Chandler:

Wow...thanks a million for taking the time to post the photo and instructions for me! Please help me with the following if you don't mind!

It looks like I have to remove the carb to gain access to the A/F screw?

I thought 2 turns out was the way it is set up at the factory?

Turning it out makes it richer or leaner?

I ride my Rhino (BRP CDI) in Rocky Point. What jets should I have in it or are the stockers okay?

What jet is located to the right of the main jet in your photo?

Should I put a breather filter on the trans vent while I am at it? Where is it located and where do I get one?

Thanks again!

Rob
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Old 03-23-2007, 06:36 PM
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I had your setup, and I KNOW that my Rhino was backfiring because of an exhaust leak. Check your header nuts, as well as the union at the muffler pipe. You should be able to feel for a leak with the Rhino running.

Good luck!
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Old 03-23-2007, 07:06 PM
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Quote: Originally Posted by Rob4092xx View Post
Chandler:

Wow...thanks a million for taking the time to post the photo and instructions for me! Please help me with the following if you don't mind!

It looks like I have to remove the carb to gain access to the A/F screw?
Yes and flip it upside down. I loosen both end clamps of the carb and the clamp for the boot connecting to the airbox. I can twist mine around without removing anything except the big vacuum line that plugs for the needle jet diaghram.

Quote: Originally Posted by Rob4092xx View Post
I thought 2 turns out was the way it is set up at the factory?
Don't know. Mine did the same and when I adjusted, it was screwed all the way in.

Quote: Originally Posted by Rob4092xx View Post
Turning it out makes it richer or leaner?
Richer

Quote: Originally Posted by Rob4092xx View Post
I ride my Rhino (BRP CDI) in Rocky Point. What jets should I have in it or are the stockers okay?
Same as Phoenix. You shouldn't be much different just with the tip but before you remove the carb, do a high speed run, full throttle and immediately shut it down and check the plug. The CDI also let's it rev higher which may require a richer main.

Quote: Originally Posted by Rob4092xx View Post
What jet is located to the right of the main jet in your photo?
I think it's called the power jet but no one ever does anything with it.

Quote: Originally Posted by Rob4092xx View Post
Should I put a breather filter on the trans vent while I am at it? Where is it located and where do I get one?
I think your talking about the CVT filter and yes, it's a good idea. The outlet is right behind the driver seat. Check rhinocrap.com and see if they carry them or call them.



Make sure you don't drill too deep when removing the plug. You just want to get a screw in for a handle to remove the plug.
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Old 03-30-2008, 10:44 PM
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Dumb question, but when you guys say to adjust the air fuel mixture screw out 2 turns, what is considered a turn? Is it done in 1/4, 1/2 or a full turn to equal 1 turn.

I was having stalling issues with my rhino like it was running out of gas. I switched to a high flow fuel pump, I swapped the needle washers to get it to run richer, and put on a tri fire cdi. Now I am getting loud back fires if I run it full throttle and let off the gas.

Thinking the air/fuel screw is my next adjustment. Am I going the wrong direction in trying to fix it, or is that sound like it could help?
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